JPS5849834B2 - Thermoluminescence dosimetry device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermoluminescence dosimeter for measuring radiation exposure dose.

FIG. 1 shows a conventional thermoluminescent device (hereinafter referred to as device).

In FIG. 1, reference numeral 1 denotes an element, and this element 1 is composed of a holder 2 and a chip 3 attached to this holder 2, and a thermoluminescent material is sealed in this chip 3.

FIG. 2 shows a conventional thermoluminescence dosimetry device.

In FIG. 2, 4 is a cylindrical housing, and a slider 5 is slidably supported on this housing 4.

6 is a knob of the slider 5, and 7 and 7' are stoppers provided on the slider 5.

The slider 5 has a recess 8 for accommodating the element 1 shown in FIG. 1, and a through hole 9.

10 is a hot air supply device provided in the housing 4, and 11 is a hot air blowing nozzle. When hot air is blown from this hot air blowing nozzle 11 onto the chip 3 of the element 1, thermoluminescence is generated according to the exposure dose. When this thermoluminescence is applied to the photomultiplier tube 12 through the through hole 9, the thermoluminescence is converted into an electric current.

By integrating this current and detecting the integrated value, the radiation exposure dose can be determined.

However, the above-mentioned conventional apparatus has the disadvantage that only one element 1 can be measured, and since the chip 3 of the element 1 is exposed, the chip 3 gets dirty and cannot perform accurate measurement.

The present invention eliminates the above-mentioned conventional drawbacks, and embodiments of the present invention will be described below.

3 and 4 show elements used in the device of the present invention.

This element 13 is composed of a case 14 and a card 15.

A flat hole 16 is formed in the case 14, and a projecting piece 17 is formed on the side, and a large number of number holes 18 are formed in this projecting piece 17.
is a formal precept.

By closing any of the number holes 18, the element number and the like are recorded.

19 is an engagement hole formed in the hole wall of the case 14, and 20 is a notch formed in the opening at one end of the case 14.

Reference numeral 21 indicates a plurality of holes formed in the card 15, and a thermoluminescent material 22 is housed in the holes.

23 is an engaging claw formed on the card 15;
5 is inserted into the flat hole 16 of the case 14, the engaging claw 23 engages with the engaging hole 19 and is held as shown in FIG.

Reference numeral 24 denotes an engagement groove formed on one end side of the card 15, and this engagement groove 24 is used when the card 15 is pulled out from the case 14.

Reference numeral 25 denotes a direction regulating groove formed on the end surface of the protruding piece 17.

Next, an embodiment of the thermoluminescence dosimeter of the present invention using the element 13 shown in FIGS. 3 and 4 will be described.

5 is a plan view of the device of the present invention, FIG. 6 is a rear view, and FIG. 7 is a side view. In FIGS. is a knob of the slider 30, 32 is a step formed on the knob 31 to prevent the incidence of external light, 33 is a position adjustment screw provided at the rear end of the slider 30, 34 is a nut, 35 is a rear plate, The longitudinal position of the slider 30 is adjusted with the position adjustment screw 33 in contact with the rear plate 35, and after the adjustment, the position adjustment screw 33 is fixed by tightening the nut 34.

36 is an inclined surface formed on the upper surface of the slider 30 as shown in FIG. 7, 37 is a spring whose one end is attached to a fixed part and the other end supports a roller 38, and the roller 38 is engaged with the inclined surface 36. Then, the slider 30 is urged rearward by the elastic force of the spring 37, and the slider 30 is held in a stable position.

Reference numeral 39 denotes an engagement release plate fixed to the guide portion of the slider 30, and this engagement release plate 39 has a projection inserted into the engagement hole 19 of the case 14 of the element 13.

When the element 13 is stored in the slider 30 and the slider 30 is slid, the protrusion of the engagement release plate 39 enters the engagement hole 19 of the element 13 and presses the engagement claw 23 of the card 15.
The engagement between the engagement claw 23 and the engagement hole 19 is released, and the card 15 is released.
This allows the device to be removed from the case 14.

In FIG. 5, reference numeral 40 denotes a card drive plate that is slidably supported in a direction perpendicular to the sliding direction of the slider 30.
A protrusion 41 that engages with the engagement groove 24 of No. 5 is formed.

42 is a rack provided on the card drive plate 40, 43 is a rotating shaft rotatably supported by bearings 44, 44', and a pin-on 45 is attached to this rotating shaft 43.

This pin-on 45 engages with the rack 42.

Reference numeral 46 denotes a knob attached to the rotating shaft 43. When the knob 46 is rotated, this rotational force is transmitted to the rack 42 through the pinion 45 and the valve, and the card drive plate 40 slides, causing the card 15 and the case 14 to move. It is something to draw out.

47 and 48 are sliding grooves formed in the housing 49, the sliding groove 47 guides the card drive plate 40, and the sliding groove 4
8 guides the card 15.

In FIG. 5, reference numeral 50 denotes a drive cam attached to the rotating shaft 43, and a recess 51 is formed in a part of the outer peripheral surface of the drive cam 50. As shown in FIG.

52 is a locking plate, and this locking plate 52 has a spring 53.
The driving force arm 50 is biased so as to come into contact with the outer circumferential surface of the driving force arm 50.

54 is a recess formed on the side surface of the slider 30;
When the knob 46 is rotated to rotate the driving force 50, the driving force 50 causes the locking plate 52 to slide, and one end of the locking plate 52 touches the slider 3.
0 and locks the slider 30.

Reference numeral 55 indicates a recess formed on the outer periphery of the driving force arm 50, and 56 indicates a plurality of V-shaped grooves similarly formed on the outer periphery of the driving force arm 50. The roller 58 urged by the roller 57 is pressed.

An intermittent rotation mechanism (FIG. 9) is established by the V-shaped groove 56, spring 57, and roller 58, and this intermittent rotation mechanism causes the card 15 to move intermittently, allowing the card 15 to move inside each hole 21. A plurality of thermoluminescent materials 22 held in the thermoluminescent material 22 are sequentially transferred to a heating measurement position.

In FIG. 6, reference numeral 59 denotes a rotary locking plate rotatably supported by a shaft 60, and at one end of this rotary locking plate 59 there is a protrusion 61 that engages with the recess 55 of the driving force arm 50. The other end of the rotary lock plate 59 is connected to a movable piece 63 of a solenoid 62.

The rotary locking plate 59 is normally biased by the elastic force of the spring 64, and the protruding piece 61 is disengaged from the recess 55 of the driving force member 50. However, when the solenoid 62 is energized, the rotary locking plate 59 rotates. The protruding piece 61 engages with the recess 55, and the rotating shaft 43 is locked (FIG. 10).

Next, the structure of the heating measuring section of the device of the present invention will be explained with reference to FIG.

In FIG. 7, reference numeral 65 denotes a housing disposed on the upper surface of the housing 49. A condensing pipe 66 is attached to this housing 65, and a reflecting mirror 67 is attached to the upper surface of this condensing pipe 66.

A heating lamp is housed within the reflecting mirror 67.

68 is an infrared transmission filter provided on the lower surface of the condensing pipe 66, 69 is a cylindrical reflecting mirror attached to the housing 49, and the inner surface of this cylindrical reflecting mirror 69 is an elliptical reflecting surface 7.
0 is prohibited.

71 is an infrared absorption filter provided on the upper surface of the cylindrical reflecting mirror 69, and the card 15 of the element 13 is disposed between the infrared absorption filter 71 and the infrared transmission filter 68.
is what is being transferred.

72 is a plane mirror, and 73 is a photomultiplier tube.

The light from the heating lamp inside the reflector 67 is directed to the condensing pipe 66
, is irradiated onto the thermoluminescent material 22 of the card 15 via an infrared transmission filter 68.

The thermoluminescence emitted from the thermoluminescent material 22 passes through an infrared absorption filter 71 and a cylindrical reflecting mirror 69, is reflected by a plane mirror 72, and enters a photomultiplier tube 73.

This photomultiplier tube 73 converts the thermoluminescence into an electric current.

Next, the operation will be explained.

The element 13 is mounted on the slider 30 and transferred to the information reading position (the position shown in FIG. 5), where the number hole 18 of the case 14 of the element 13 is read.

At this time, the slider 30 has the position adjustment screw 33 provided at the rear of the slider 30 contacting the locking plate 35, and
The element 13 is urged backward by the pressing force of the roller 38 and
The card 15 in the case 14 and the sliding groove 48 of the card 15
is regulated so that it is in the proper position.

Further, the card 15 includes an engagement release plate 39 and a card drive plate 4.
0, the engagement between the case 14 and the card 15 is released, and the card 15 can be pulled out by the card driving plate 40.

When the knob 46 is rotated in this state, the pin-on 45 rotates, moving the rack 42 of the card drive plate 40, and the card drive plate 40 moves in the direction of arrow D (FIG. 5).

At this time, the card 15 is also pulled out from the case 14 and moved.

As the knob 46 is rotated, the roller 58 moves against the urging force of the spring 57 and moves into the V-shaped groove 56 of the driving force member 50.
The knob 46 is rotated until it re-engages with.

Further, the slider locking plate 52 that was engaged with the recess 51 of the driving force arm 50 moves in the direction of arrow E (FIG. 5), and the slider 3
0, and the slider 30 cannot be removed.

At this time, the thermoluminescent material 22 of the card 15 is located between the heating lamp and the cylindrical reflector 69.

When a measurement start button (not shown) is pressed in this state, the photointerrupter 74 first determines whether or not the driving force 50 is in the normal position, and when it is in the normal position, the thermoluminescent material 22 is heated by the heating lamp. do.

The thermoluminescent material 22 generates thermoluminescence when heated.

The infrared component of this thermoluminescence is cut by an infrared absorbing filter 71, and a cylindrical reflecting mirror 69 and a plane mirror 72
The light is reflected by the photomultiplier tube T3 and is incident on the light receiving surface of the photomultiplier tube T3 in a substantially condensed state.

Simultaneously with this measurement start signal, the solenoid 62 is attracted, the rotary lock plate 59 is rotated in the direction of arrow F (FIG. 6), and the protrusion 61 of the rotary lock plate 59 is inserted into the recess 55 of the driving force arm 50.
This restricts the pin-on 45 from rotating even when the knob 46 is turned.

When the measurement is completed, the solenoid 62 is de-energized, the rotary lock plate 59 is rotated in the direction of arrow C (FIG. 6) by the force of the spring 64, and the rotary lock of the knob 46 is released.

Further, the measurement operation described above is performed by turning the knob 46 until the next thermoluminescent material 22 comes to the heating measurement position and pressing the measurement start button.

The slider locking plate 52 is engaged with the recess 54 of the slider 30 until the card 15 is pulled out by the driving force 5o and returned to the case 14.

When all the measurements of the thermoluminescent material 22 provided on the card 15 are completed, the card 15 is returned to the case 14. At that time, the knob 46 is rotated counterclockwise.
This is done by moving the card driving plate 40 to which the rack 42 is fixed by the pin-on 45 in the direction of arrow G.

When the force arm 15 is completely housed in the case 14, the V-shaped groove 51 of the drive force arm 50 and the slider chain plate 52 are engaged, and the slider 30 can be removed.

When the slider 30 is further pulled out, the locking claw 23 of the card 15 is engaged with the engagement hole 19 of the case 14 again.
A card 15 is held in the case 14.

The present invention has the above-mentioned configuration, which allows a plurality of thermoluminescent materials to be sequentially and accurately moved to a heating measurement position by manual operation, and also includes a rotating lock to prevent the card from being moved during heating measurement. Since it is provided with a mechanism and a slider locking plate that prevents the slider from being removed when the card is removed, there is no risk of erroneous operation, which has the advantage of preventing erroneous measurements. It is a highly reliable thermoluminescence dosimetry device that does not require radiation.

Furthermore, in the present invention, the information on the thermoluminescent element is read when the slider is correctly inserted into the device, so it is not only possible to confirm whether or not the thermoluminescent element is correctly loaded into the device. Since the numbers can be verified before measurement, the reliability of the measurement operation is improved, and it has the advantage that it is possible to determine whether it is an element to be measured and to check for incorrect numbers at an early stage.

Sixth, since the card is pulled out of the case only during measurement, it also has the advantage of preventing erroneous measurements due to dirt or the like.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a conventional thermoluminescent device, and FIG. 2 is a side sectional view of a conventional thermoluminescent dosimetry device.
FIG. 3 is a perspective view of an element used in the thermoluminescence dosimetry device of the present invention, FIG. 4 is a cross-sectional view of the same plane, and FIG. 5 is a cross-sectional view of a part of the thermoluminescence dosimetry device in one embodiment of the present invention. 6 is a rear view of the same, FIG. 7 is a sectional view of the same side, FIG. 8 is a diagram showing the slider locking mechanism of the device, and FIG. 9 is a diagram showing the intermittent rotation mechanism of the device. , 1st
Figure 0 is a diagram showing the rotation locking mechanism of the device. 13... Thermoluminescent element, 14... Curved case, 15... Card, 22... Thermoluminescent material, 30... Slider 36
... Slanted surface, 37 ... Spring, 38 ...
...Roller, 40 ... Card drive plate, 42
...Rack, 42...Rack, 43.
... Rotating axis, 45 ... Pin-on, 50.
... Drive cam, 51 ... Concavity: 52 ...
... Locking plate, 54 ... Recessed part, 55 ...
... Recessed portion, 56 ... V-shaped groove, 57 ... Curved spring, 58 ... Roller, 59 ... Rotating locking plate, 61 ... Curved protrusion piece, 62...Solenoid, 6
3...Movable piece.

Claims (1)

[Scope of Claims] 1. A thermoluminescent element for removably holding a card to which a plurality of thermoluminescent materials are fixed, and a card locking means for holding the card within the thermoluminescent element. , a slider for transferring the thermoluminescent element into the apparatus, a card unlocking means for unlocking the thermoluminescent element and the card at the end of the transfer of the slider into the apparatus, and a number of thermoluminescent elements. A means to continue the number to read,
A card drive plate that extracts and transfers the card from the thermoluminescent element at this position, a heating measuring means provided on the card transfer path, a rack provided on the card drive plate, and a pinion and drive cam that mesh with the rack are attached. a rotating shaft for removing the card from the thermoluminescent element; a slider locking plate that is driven by a drive cam to prevent the slider from being removed as the rotating shaft rotates to remove the card from the thermoluminescent element; a heating measuring means position; and a thermoluminescent material. A thermoluminescence dose device characterized by comprising: an intermittent rotation mechanism that locks the rotation of the rotation shaft at respective opposing positions; and a rotation locking mechanism that prevents rotation of the rotation shaft during heating measurement. measuring device. 2. Claim 1, wherein a plurality of V-shaped grooves are formed on the outer peripheral surface of the drive cam, and a roller biased by a spring is engaged with the V-shaped grooves to constitute an intermittent rotation mechanism. The thermoluminescent dosimetry device described. 3. A patent in which a rotary locking mechanism is constituted by a recess formed on the outer peripheral surface of a drive cam, a rotary locking plate having a protrusion that engages with the recess, and a solenoid that drives the rotary locking plate. Thermoluminescence dosimetry device according to claim 1.