JP4868495B2 - Radioactive aqueous solution manufacturing apparatus and radioactive aqueous solution manufacturing method - Google Patents

Description

  The present invention relates to a radioactive aqueous solution production apparatus and a radioactive aqueous solution production method for obtaining a radioactive aqueous solution by eluting a decay product of a radioactive substance contained in a base material into raw material water.

  It has long been known that hot springs containing radioactive substances such as radon and radium have the effect of promoting the healing of various diseases. Hot springs containing radioactive substances are called radioactive springs. In Japan, Misasa Onsen in Tottori Prefecture, Tamagawa Onsen in Akita Prefecture, etc. are famous overseas, such as the Gastein Healing Trail in Bad Gastein, Salzburg, Austria. It has become. In recent years, attempts have been made to artificially produce radioactive aqueous solutions having the same effects as these radioactive springs, and various radioactive aqueous solution production apparatuses have been proposed.

  For example, an inner tank for containing a base material containing a radioactive substance, and an outer tank for immersing the inner tank in raw water, the inner tank is formed of a water-permeable material, and the radioactive substance is destroyed. A radioactive aqueous solution manufacturing apparatus has been proposed in which a radioactive aqueous solution is obtained by eluting a substance into the raw material water (see, for example, Patent Document 1). However, most of this type of radioactive aqueous solution production apparatus has not been able to quickly elute the decay products, and it takes time to produce the radioactive aqueous solution.

  In view of such a situation, a radioactive aqueous solution manufacturing apparatus has also been proposed in which bubble injection means for injecting bubbles is provided so that the base material accommodated in the inner tank can be stirred with bubbles (for example, (See Patent Document 2). However, in the radioactive aqueous solution manufacturing apparatus in which the base material is stirred with bubbles, if the pore diameter of the water-permeable material forming the inner tank is set small, the bubbles cannot enter the inner tank, and the base material is stirred. There was a drawback that it could not be performed effectively.

  For this reason, in the radioactive aqueous solution manufacturing apparatus in which the substrate is stirred with bubbles, the pore diameter of the water-permeable material forming the inner tank must be set large, and the particle size of the substrate can be set small. There wasn't. Therefore, it cannot be said that the apparatus for producing a radioactive aqueous solution in which the base material is stirred with bubbles can rapidly elute the decay product. This is because if the particle size of the base material is large, the surface area per unit volume of the base material becomes narrow, and the decay products are difficult to elute.

Japanese Patent Publication No. 60-047858 (Claims, column 5, lines 6-19, FIG. 2) Japanese Patent Publication No. 06-048320 (Claims, column 5, line 25 to column 6, line 1, FIG. 1)

  The present invention has been made in order to solve the above-described problems, and provides a radioactive aqueous solution manufacturing apparatus capable of quickly eluting a decay product of a radioactive substance contained in a base material into raw material water. . More specifically, the present invention provides an apparatus for producing a radioactive aqueous solution that can not only stir the base material but also can set the pore diameter of the water-permeable material forming the inner tank small. It is also an object of the present invention to provide a method for producing a radioactive aqueous solution that can quickly dissolve a decay product of a radioactive substance contained in a base material into raw material water.

  The above-described problem includes an inner tank for containing a base material containing a radioactive substance, and an outer tank for immersing the inner tank in raw material water, the inner tank is formed of a water-permeable material, and the radioactive substance A radioactive aqueous solution manufacturing apparatus for obtaining a radioactive aqueous solution by eluting a decay product into the raw material water, comprising a rotation driving means for rotating and driving an inner tank. It is solved by. Thereby, even if it is a case where the aperture diameter of the water-permeable material which forms an inner tank is set small, it becomes possible to stir the base material accommodated in the inner tank.

  The inner tub is not particularly limited as long as a part or the whole of the inner tub is formed of a water-permeable material and can hold the base material therein, but is usually formed in a cylindrical shape (including a polygonal cylinder). . In this case, the peripheral wall of the inner tank is usually formed of a water-permeable material.

  At this time, it is preferable to provide a stirring plate for stirring the base material in the inner peripheral portion of the inner tank. Thereby, it becomes possible to stir the base material accommodated in the inner tank more effectively.

  It is also preferable to incline the stirring plate with respect to the central axis of the inner tank. Thereby, it becomes possible to stir the base material accommodated in the inner tank more effectively. Here, “inclination” means that the main surface of the stirring plate (the surface that has the largest area among the surfaces constituting the stirring plate and can contribute most to the stirring of the base material) is not relative to the central axis of the inner tank. A state that is vertical.

  Furthermore, it is also preferable to arrange a plurality of stirring plates in the direction of the central axis of the inner tank at a predetermined interval. Thereby, a base material can be stirred now in the wide range of an inner tank. In addition, the base material can be easily escaped from the gap between adjacent stirring plates, and the base material can be prevented from being stuck on the stirring plate.

  Furthermore, it is also preferable to provide a heating means for heating the raw material water. As a result, the decay product can be more easily eluted in the raw water. Further, the obtained radioactive aqueous solution can be used as warm bath water as it is. Furthermore, the temperature and humidity at the installation location of the radioactive aqueous solution manufacturing apparatus can be increased.

  By the way, the above-described problem is that a base material containing a radioactive substance is accommodated in an inner tank formed of a water-soluble material, the inner tank is immersed in raw water stored in an outer tank, and the decay product of the radioactive substance is This is solved by providing a radioactive aqueous solution manufacturing method for obtaining a radioactive aqueous solution by eluting into raw material water, wherein the decay product is eluted while rotating an inner tank. This radioactive aqueous solution manufacturing method can be suitably implemented using the above-described radioactive aqueous solution manufacturing apparatus.

  As described above, according to the present invention, it is possible to provide a radioactive aqueous solution manufacturing apparatus capable of quickly eluting a decay product of a radioactive substance contained in a base material into raw material water. More specifically, it is possible to provide a radioactive aqueous solution manufacturing apparatus that can not only stir the base material but also can set the pore diameter of the water-permeable material forming the inner tank small. In addition, it is possible to provide a method for producing a radioactive aqueous solution capable of quickly eluting a decay product of a radioactive substance contained in a base material into raw material water.

The radioactive aqueous solution manufacturing method and radioactive aqueous solution manufacturing apparatus of this invention are demonstrated more concretely using drawing. FIG. 1 is an explanatory view showing a radioactive aqueous solution production apparatus of the present invention. Figure 2 is a cross-sectional view of the inner tank showing a state taken along a plane perpendicular to the central axis L ₁ in the radioactive solution producing apparatus of the present invention. Figure 3 is a perspective view of the inner tank showing a state where divided by a plane including the center axis L ₁ in the radioactive solution producing apparatus of the present invention. FIG. 4 is a view showing a state where one stirring plate row in the radioactive aqueous solution production apparatus of the present invention is viewed from the front end side of each stirring plate.

1.0 Radioactive aqueous solution production apparatus First, the radioactive aqueous solution production device of the present invention will be described. As shown in FIG. 1, the radioactive aqueous solution manufacturing apparatus 100 of the present embodiment includes an inner tank 110, an outer tank 120, a rotation driving means 130, and a heating means 140. This radioactive aqueous solution manufacturing apparatus 100 obtains a radioactive aqueous solution by eluting a decay product of radioactive material contained in a base material into raw material water 200.

1.1 Inner Tank (1) Outline of Inner Tank The inner tank 110 is for housing a base material containing a radioactive substance. As shown in FIGS. 2 and 3, the inner tank 110 is formed in a cylindrical shape, and its peripheral wall is formed of a water-permeable material 111. The material of the water-permeable material 111 is not particularly limited, but usually metal or ceramic having excellent strength is employed. In the radioactive aqueous solution manufacturing apparatus 100 of this embodiment, the water-permeable material 111 is formed of stainless steel. The inner tank 110 is adapted to be rotated on its center axis L ₁ around the rotary drive means 130. The capacity of the inner tank 110 differs depending on the capacity of the base material accommodated therein, and is not particularly limited. However, in the radioactive aqueous solution manufacturing apparatus 100 of this embodiment, about 6 L (the inner diameter of the inner tank 110 is 155 mm, in the central axis direction). The length is 324 mm).

(2) Opening Diameter of Water-permeable Material The opening diameter of the water-permeable material 111 varies depending on the particle size of the base material accommodated in the inner tank 110 and is not particularly limited. However, if the pore diameter of the water-permeable material 111 is set too small, the water-permeable material 111 may be easily clogged with the base material. For this reason, the aperture diameter of the water-permeable material 111 is normally set to 10 μm or more. The pore diameter of the water-permeable material 111 is preferably 30 μm or more, more preferably 40 μm or more, and further preferably 50 μm or more.

  On the other hand, if the pore diameter of the water-permeable material 111 is set too large, the particle size of the base material accommodated in the inner tank 110 cannot be set small, and the decay product of the radioactive substance contained therein is the raw water 200. May be difficult to elute. For this reason, the aperture diameter of the water-permeable material 111 is normally set to 1 mm or less. The pore diameter of the water-permeable material 111 is preferably 500 μm or less, more preferably 300 μm or less, and further preferably 200 μm or less. In the radioactive aqueous solution manufacturing apparatus 100 of the present embodiment, the water permeable material 111 is a laminate of two water permeable sheets having an aperture diameter of 60 μm and one water permeable sheet having an aperture diameter of 50 μm. .

(3) Stirring plate In the radioactive aqueous solution manufacturing apparatus 100 of the present embodiment, a plurality of stirring plates 112 for stirring the base material are provided on the inner peripheral portion of the inner tank 110 as shown in FIGS. Yes. A plurality of agitating plates 112, as shown in FIGS. 3 and 4, are arranged in a direction parallel to the center axis L ₁ of the inner tank 110 at predetermined intervals, the center axis L ₁ parallel to the plurality of the agitating plate column Is forming. As shown in FIG. 4, each stirring plate 112 is provided to be inclined with respect to the central axis L <b> ₁ of the inner tank 110. Each agitating plate column, as shown in FIGS. 2 and 3, are arranged at positions which are rotationally symmetric with respect to the center axis L ₁ of the inner tank 110, the orientation of the agitating plate 112 of the agitating plate adjacent rows are alternately It comes to become. For this reason, the base material accommodated in the inner tank 110 is not biased toward one end of the inner tank 110.

(4) Stirring Plate Spacing The spacing D ₁ (see FIG. 4) of the stirring plate 112 varies depending on the dimensions of the stirring plate 112 and the particle size of the substrate, and is not particularly limited. However, when set too narrow interval D ₁ of the agitating plate 112, it may become easier to substrate in a gap agitating plate 112 adjacent clogging. Therefore, the distance _{D 1} of the agitating plate 112 is usually set to at least 5 mm. Spacing _{D 1} of the agitating plate 112, preferable to be 10mm or more, more preferably 15mm or more and further preferably 20mm or more.

On the other hand, if set too wide spacing D ₁ of the agitating plate 112, agitation of the substrate may be insufficient. Therefore, the distance _{D 1} of the agitating plate 112 is usually set to 60mm or less. Spacing _{D 1} of the agitating plate 112, preferable to be 50mm or less, more preferable to be 40mm or less, more preferably a 30mm or less. In the radioactive solution producing apparatus 100 of the present embodiment, the distance _{D 1} of the agitating plate 112 is set to approximately 22 mm.

(5) Inclination angle of stirring plate The inclination angle θ ₁ (see FIG. 4) of the stirring plate 112 with respect to the central axis L ₁ of the inner tank 110 is defined in the range of 0 ° to 90 °, and the size thereof is There is no particular limitation. However, if the inclination angle θ ₁ of the stirring plate 112 is set too small, the base material may be easily clogged between the inner peripheral surface of the inner tank 110 and the stirring plate 112. For this reason, the inclination angle θ ₁ of the stirring plate 112 is normally set to 5 ° or more. The inclination angle θ ₁ of the stirring plate 112 is preferably 10 ° or more, preferably 15 ° or more, and more preferably 20 ° or more.

On the other hand, if the inclination angle θ ₁ of the stirring plate 112 is set too large (set to a value close to 90 °), the central axis L ₁ of the inner tank 110 and the stirring plate 112 approach each other vertically, and the stirring plate 112 The material may not be effectively stirred. For this reason, the inclination angle θ ₁ of the stirring plate 112 is normally set to 80 ° or less. The inclination angle θ ₁ of the stirring plate 112 is preferably 60 ° or less, more preferably 50 ° or less, and further preferably 40 ° or less. In the radioactive solution producing apparatus 100 of the present embodiment, the inclination angle theta ₁ of the agitating plate 112 is set to 30 °.

1.2 Outer Tank (1) Outline of Outer Tank As shown in FIG. 1, the outer tank 120 is for immersing the inner tank 110 in the raw water 200. Although the raw material of the outer tank 120 is not specifically limited, in the radioactive aqueous solution manufacturing apparatus 100 of this embodiment, it formed with the outer wall formed with stainless steel (SUS304), and stainless steel (SUS316L) excellent in acid resistance. Glass wool with excellent heat insulation is filled in the gap with the inner wall. The upper lid 124 that covers the upper part of the outer tub 120 is provided with a large number of ventilation holes so that water vapor rising from the raw water 200 can be discharged to the outside of the outer tub 120. The capacity of the outer tub 120 varies depending on the amount of the base material accommodated in the inner tub 110 and is not particularly limited. However, in the radioactive aqueous solution manufacturing apparatus 100 of this embodiment, a maximum of about 37 L (the width of the outer tub 120 is The raw water 200 having a size of 448 mm, a depth of 243 mm, and a height from the bottom surface to the overflow hole 121 of 339 mm) can be stored.

(2) Raw material water supply means An upper part of the outer tank 120 is provided with a mixing tank 125 for preparing raw material water 200 by mixing tap water and a chemical solution as shown in FIG. A certain raw material water 200 can be prepared. The chemical solution is supplied from the chemical solution pot 160. In the lower part of the mixing tank 125, raw water supply means 122 for supplying the raw water 200 prepared in the mixing tank 125 to the inside of the outer tank 120 is provided. The raw water supply means 122 is not particularly limited as long as it can supply the raw water 200, but the radioactive aqueous solution manufacturing apparatus 100 of the present embodiment uses a spray nozzle that sprays the raw water 200 in a mist form. . For this reason, a decay product such as radon that has not been eluted by the raw material water 200 accumulated in the lower part of the outer tank 120 and has risen to the upper part of the outer tank 120 is brought into contact with the raw material water 200 again. Can be eluted more efficiently.

(3) Water Level Detection Unit A water level detection unit 123 for detecting the water level of the raw water 200 is provided inside the outer tank 120. For this reason, when the raw water 200 stored in the outer tank 120 decreases or increases, an alarm is output or the amount of the raw water 200 supplied from the raw water supply means 122 is adjusted. You can do that. Therefore, there is no great variation in the radioactivity concentration of the manufactured radioactive aqueous solution, and the safety of the radioactive aqueous solution with respect to the living body can be further ensured.

1.3 Rotation Drive Unit The rotation drive unit 130 is for driving the inner tank 110 to rotate. The rotation driving means 130 is not particularly limited as long as the inner tank 110 can be rotationally driven, but a motor is usually used. The rotational driving means 130 may be configured to rotationally drive the inner tank 110 about a non-horizontal axis. However, in the radioactive aqueous solution manufacturing apparatus 100 of this embodiment, as shown in FIG. the inner tank 110 has a one for rotating about its central axis L _1, which is intended for rotating the inner tub 110 in the horizontal axis direction.

1.4 Heating means The heating means 140 is for heating the raw water 200. The heating means 140 is not particularly limited as long as it can heat the raw water 200 to a predetermined temperature, and various conventionally known heaters can be used. Among them, a heater using a resistance heating element is suitable because not only electric energy can be converted into heat energy with high efficiency, but also temperature adjustment is easy. Examples of resistance heating elements include iron-chromium-aluminum alloys, nickel-chromium alloys, and tungsten. In the radioactive aqueous solution manufacturing apparatus 100 of this embodiment, a sheathed heater in which the outside of the resistance heating element is covered with a metal sheath (sheath) is used as the heating means 140.

2.0 Radioactive aqueous solution manufacturing method Next, the radioactive aqueous solution manufacturing method of this invention is demonstrated. In the following, the method for producing a radioactive aqueous solution of the present invention will be described using the radioactive aqueous solution production apparatus 100 shown in FIG. 1, but the radioactive aqueous solution production apparatus 100 of the present invention is limited to this embodiment. is not.

2.1 Base Material First, a base material is accommodated in the inner tank 110. The type of the substrate is not particularly limited as long as it is a solid substance containing a radioactive substance such as uranium or thorium, but usually a radioactive mineral such as monazite, xenotime, or zircon is used. However, if the concentration of radiation emitted from it is 370 Bq / g or more, the base material falls under “radioisotope” whose handling is regulated by the “law on the prevention of radiation damage caused by radioisotopes”. Therefore, it is preferable to use a radiation having a concentration of less than 370 Bq / g.

  The base material may be housed in the inner tank 110 in a lump shape, but is preferably housed in the inner tank 110 in a state of being crushed into particles. As a result, the contact area between the base material and the raw material water 200 can be increased, and the decay product of the radioactive substance contained in the base material can be quickly eluted by the raw material water 200.

  The particle size of the substrate is not particularly limited as long as it is large enough not to pass through the water-permeable material 111 forming the inner tank 110. However, if the particle size of the base material is set too small, in order to hold the base material in the inner tub 110, the pore diameter of the water-permeable material 111 must be set very small. In addition to the possibility of clogging, there is a risk that the raw water inside the inner tank 110 and the raw water outside the inner tank 110 may be difficult to exchange. For this reason, the particle size of a base material is normally set to 10 micrometers or more. The particle size of the substrate is preferably 50 μm or more, more preferably 80 μm or more, and further preferably 100 μm or more.

  On the other hand, if the particle size of the base material is set too large, it is impossible to ensure a wide contact area between the base material and the raw material water, and the decay products of radioactive substances contained in the base material are eluted into the raw material water. May be difficult. For this reason, the minimum particle size of the base material is normally set to 10 mm or less. The particle size of the substrate is preferably 5 mm or less, more preferably 1 mm or less, and even more preferably 500 μm or less.

  In the method for producing a radioactive aqueous solution according to the present embodiment, Badgastein ore (ore that slightly contains radium and dissipates radon) produced in Bad Gastein, Salzburg, Austria, is crushed into granules having a particle size of 120 to 300 μm. As a base material. This Badgastein ore not only provides the right amount of radiation that can produce a hormesis effect known as the effect of a radioactive spring (a beneficial effect brought about by a low dose of radiation), but is also readily available Therefore, it can be suitably used in the method for producing a radioactive aqueous solution of the present invention.

  For reference, the components of Bad Gastein ore used as a base material in the method for producing a radioactive aqueous solution of the present embodiment are shown in Table 1 below. However, the results in Table 1 below are based on the qualitative analysis of Bad Gastein ore by high frequency inductively coupled plasma optical emission spectrometry (ICP-AES), and quantitatively determined for each of the 14 elements detected by the qualitative analysis. It was obtained by conducting an analysis. Quantitative analysis of each element was performed by gravimetric method for Si, atomic absorption spectrophotometry for Na and K, and high frequency inductively coupled plasma emission spectrometry for other elements.

  Moreover, the radioactive concentration of the Bad Gastein ore used as a base material in the radioactive aqueous solution manufacturing method of this embodiment is shown in Table 2 below. However, the results in Table 2 below were obtained for 100 g of Bad Gastein ore with a particle size set to 120 to 140 μm. The radioactivity concentration was measured by measuring γ rays using a high-purity germanium detector (HPGe detector).

  The amount of the base material accommodated in the inner tank 110 varies depending on the desired radioactive concentration of the obtained radioactive aqueous solution, and is not particularly limited. However, in the radioactive aqueous solution manufacturing method of this embodiment, 2000 g of the base material is added to the inner tank. 110. When the storage of the base material in the inner tank 110 is completed, the inner tank 110 is stored in the outer tank 120 and connected to the rotation driving means 130.

2.2 Raw material water

  Subsequently, the raw water 200 is supplied into the outer tank 120, and the inner tank 110 is immersed in the raw water 200. The type of the raw water 200 varies depending on the use of the obtained radioactive aqueous solution and is not particularly limited, but is preferably acidic water having a pH of less than 7 before contacting with the substrate. As a result, the decay product of the radioactive substance contained in the base material can be quickly eluted by the raw water 200.

  When the obtained radioactive aqueous solution is used as warm bath water, the pH of the raw water 200 before contact with the base material is more preferably 1 to 5, and further preferably 2 to 4. In the method for producing a radioactive aqueous solution of this embodiment, acidic water having a pH of 3 before being brought into contact with the substrate is used as the raw material water 200. However, if the pH of the raw material water 200 after being brought into contact with the base material for a predetermined time becomes too low, the raw material water 200 strongly stimulates the skin, mucous membranes, etc., and becomes difficult to use as warm bath water. For this reason, it is preferable to adjust the amount of the raw water 200, the amount of the base material, the stirring time and the like so that the raw material water 200 after being brought into contact with the base material for a predetermined time is neutralized as much as possible.

  The amount of the raw water 200 stored in the outer tub 110 varies depending on the amount of base material accommodated in the inner tub 110 and is not particularly limited. In the radioactive aqueous solution manufacturing method of this embodiment, the amount of the raw water 200 stored in the outer tank 120 is set to be 25L. In addition, an air layer is provided between the upper surface of the raw water 200 stored in the outer tank 120 and the upper lid 124, and the temperature of the water vapor released from the vent hole provided in the upper lid 124 is set to a desired temperature. Can be lowered. In the method for producing a radioactive aqueous solution of the present embodiment, the height of the air layer is set to 415 mm, and water vapor cooled to about 45 ° C. is discharged from the vent hole of the upper lid 124. Yes.

2.3 Heating When the raw material water 200 is stored in the outer tank 110 in a predetermined amount, the heating unit 140 is driven to heat the raw water 200 stored in the outer tank 120 to a predetermined temperature (T). The temperature T varies depending on the type of the substrate and is not particularly limited. However, when the temperature T is too low, there is a possibility that the decay product is not easily eluted from the substrate. For this reason, the temperature T is normally set to 35 ° C. or higher. The temperature T is preferably 50 ° C. or higher, more preferably 60 ° C. or higher, and further preferably 70 ° C. or higher. In the radioactive aqueous solution manufacturing method of this embodiment, the temperature T is set to 80 ° C.

2.4 Stirring When the raw water 200 is heated to the predetermined temperature T, the rotation driving means 130 is activated to rotate the inner tank 110 to stir the base material accommodated in the inner tank 110. The rotational speed of the inner tank 110 varies depending on the amount of base material accommodated in the inner tank 110 and is not particularly limited. However, if the rotational speed of the inner tank 110 is set too low, the base material may not be effectively stirred. For this reason, the rotational speed of the inner tank 110 is normally set to 20 rpm or more. The rotation speed of the inner tank 110 is preferably 30 rpm or more, more preferably 35 rpm or more, and further preferably 40 rpm or more.

  On the other hand, if the rotation speed of the inner tub 110 is set too fast, the base material accommodated in the inner tub 110 is biased to the vicinity of the inner peripheral portion of the inner tub 110, or from the portion formed of the water-permeable material, There is a risk of going outside. For this reason, the rotational speed of the inner tank 110 is normally set to 120 rpm or less. The rotation speed of the inner tank 110 is preferably 90 rpm or less, more preferably 75 rpm or less, and further preferably 60 rpm or less. In the radioactive aqueous solution manufacturing method of this embodiment, the rotation speed of the inner tank 110 is set to 45 rpm.

  The stirring time of the substrate varies depending on the rotation speed of the inner tank 110 and the like, and is not particularly limited. However, if the stirring time of the substrate is set too short, the decay product may not be sufficiently eluted from the substrate. For this reason, the stirring time of a base material is normally set to 60 minutes or more. The stirring time of the substrate is preferably 120 minutes or more, more preferably 180 minutes or more, and further preferably 210 minutes or more. In the radioactive aqueous solution manufacturing method of this embodiment, the stirring time is set to 240 minutes.

2.5 Uses The radioactive aqueous solution produced by the above-described radioactive aqueous solution production method can be used for various uses. Especially, it is suitable when it uses as warm bath water. In this case, the obtained warm bath water (radioactive aqueous solution) may be stored in a bath as it is, but is preferably vaporized (as steam in a steam bath). Thereby, the decay products such as radon contained in the warm bath water can be absorbed into the body from the respiratory mucosa, and the decay products can be taken into the body more efficiently. Therefore, a better hormesis effect can be expected.

It is explanatory drawing which showed the radioactive aqueous solution manufacturing apparatus of this invention. It is a cross-sectional view of the inner tank showing a state taken along a plane perpendicular to the central axis L ₁ in the radioactive solution producing apparatus of the present invention. It is a perspective view of the inner tank showing a state where divided by a plane including the center axis L ₁ in the radioactive solution producing apparatus of the present invention. It is the figure which showed the state which looked at the one stirring board row | line in the radioactive aqueous solution manufacturing apparatus of this invention from the front end side of each stirring board.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Radioactive aqueous solution manufacturing apparatus 110 Inner tank 111 Water-permeable material 112 Stirring plate 120 Outer tank 121 Overflow hole 122 Raw material water supply means 123 Water level detection means 124 Upper lid 125 Mixing tank 130 Rotation drive means 140 Heating means 150 Pump 160 Chemical liquid pot 200 Raw material water

Claims (8)

  An inner tank for containing a substrate containing a radioactive substance, and an outer tank for immersing the inner tank in raw water, the inner tank is formed of a water-permeable material, and the decay product of the radioactive substance is A radioactive aqueous solution manufacturing apparatus for obtaining a radioactive aqueous solution by eluting into the raw material water, wherein the apparatus is provided with a rotation driving means for rotating the inner tank.   The radioactive aqueous solution manufacturing apparatus of Claim 1 which provided the stirring board for stirring a base material in the inner peripheral part of the inner tank.   The radioactive aqueous solution manufacturing apparatus according to claim 2, wherein the stirring plate is inclined with respect to the central axis of the inner tank.   The radioactive aqueous solution manufacturing apparatus of Claim 2 or 3 which arranged the some stirring board in the center axis direction of the inner tank at predetermined intervals.   The radioactive aqueous solution manufacturing apparatus in any one of Claims 1-4 provided with the heating means for heating the said raw material water.   The radioactive solution manufacturing apparatus in any one of Claims 1-5 which set the aperture diameter of the said water-permeable material to 1 mm or less.   A base material containing a radioactive substance is placed in an inner tank formed of a water-based material, the inner tank is immersed in raw water stored in the outer tank, and the decay product of the radioactive substance is eluted in the raw water. A radioactive aqueous solution production method for obtaining a radioactive aqueous solution by the method, wherein the decay product is eluted while rotating an inner tank.   The radioactive aqueous solution manufacturing method of Claim 7 which set the particle size of the base material to 10 mm or less.

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