JPS586158B2 - thermoluminescent dosimeter - Google Patents

Description

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

When a thermoluminescence dosimeter element (hereinafter referred to as an element) that has been exposed to radiation is heated, thermoluminescence is emitted from the element in accordance with the exposure dose.

This thermoluminescence is converted into a current using a photomultiplier tube and integrated, and by measuring this integrated value, the radiation exposure dose can be determined.

1 and 2 show elements used in the thermoluminescence dosimeter of the present invention.

In FIGS. 1 and 2, 1 is a case body, and this case body 1 is formed with protrusions 2 and 3.
A cover plate 4 is fixed to the upper surface of 3 to form a case with one end open.

5 is a notch formed between the protrusions 2 and 3, and 6 is the protrusion 2.
A protrusion 7 formed at the end of the case body 1 is an information reading section formed integrally with the case body 1. A large number of holes 8 are formed in the information reading section 7, and by closing any hole 8, Personal code etc. are recorded.

Reference numeral 9 denotes a card housed in the case. A plurality of holes 10 are formed in the card 9 at intervals p, and a thermoluminescent material 11 is housed in the holes 10.

Reference numeral 12 indicates an engaging claw formed on the card 9, and reference numeral 13 indicates a recess formed in the card 9. When the card 9 is inserted into the case, the engaging claw 12 engages with the notch 5, and the card 9 is inserted into the case. 9 is held within the case.

FIGS. 3, 4, and 5 show a magazine that stores a large number of the elements shown in FIG. 1.

In FIGS. 3 to 5, reference numeral 14 designates a magazine whose top surface is open and whose interior is partitioned by a partition wall 15, and a hole 16 is formed in the bottom surface of this magazine 14.

17 is a protruding piece provided at a corner of each compartment 18 of the magazine 14, and 19 is a rack formed on a side surface of the magazine 14.

The element 20 shown in FIG. 1 is attached to the magazine 1 with the information reading section 7 side facing down, as shown by broken lines in FIGS. 4 and 5.
4 into each compartment 18.

FIG. 6 schematically shows the entire thermoluminescent dosimeter of the present invention.

In FIG. 6, 21 is a board, and guide plates 22, 22' for guiding the magazine 14 are fixed to this board 21.

23.23' is a spring whose one end is fixed to the guide plate 22, 22' and the other end supports the rollers 24, 24', and the rollers 24, 24/ are formed on the guide plate 22, 22'. Guide plates 22, 22' through windows 25, 25'
It protrudes inward and presses the magazine 14 against one side wall of the guide plates 22, 22' by the elastic force of the springs 23, 23'.

26 is a pulse motor, and a gear 28 is fixed to a rotating shaft 27 of this pulse motor 26.

This gear 28 meshes with the rack 19 of the magazine 14.

29 is a disc fixed to the rotating shaft 27, and this disc 29 has a plurality of holes 30 formed at equal intervals.

Reference numerals 31 and 32 denote a light emitting diode and a phototransistor, respectively, which are arranged opposite to each other with the disk 29 in between, and the number of holes 30 in the disk 29 is also 8 compared to the 8 teeth of the gear 28.
If the pulse motor 26 rotates by the commanded number of pulses without making a mistake, the number of holes 30 is detected by the phototransistor 32 of the light emitting diode 31, and the magazine 14 is transferred at a predetermined pitch. is what is detected.

33, 34.35 are light emitting diodes, 36, 37.38
is a phototransistor, and the magazine 14 is inserted into the guide plate 22 by the light emitting diode 33 and the phototransistor 36, and the rack 19 of the magazine 14 is connected to the gear 28.
The end of the magazine 14 is detected by the light emitting diode 34 and the phototransistor 37, and the light emitting diode 35 and the phototransistor 38 detect whether the element 20 is housed in the magazine 14. When the light emitting diode 35 and phototransistor 38 detect that no element 20 is stored, the pulse motor 26 continues to rotate and transports the magazine 14 until the next element 20 is detected. be.

Furthermore, when the magazine 14 is transferred to the end, the light emitting diode 34 and the phototransistor 37 are transferred to the magazine 1.
4 is detected, and the rotation of the pulse motor 26 is stopped.

39 is a pulse motor, and a gear 41 is attached to a rotating shaft 40 of this pulse motor 39.

42 is a sliding rod, and the above-mentioned gear 41 is attached to the sliding rod 42.
A rack 43 is formed which engages with.

Reference numeral 44 denotes a push-up plate provided at the upper end of the slide rod 42. When the pulse motor 39 rotates in one direction, the slide rod 42 rises, and the push-up plate 44 is inserted into the hole 16 formed at the bottom of the magazine 14. inserted, one element 20 is pushed up, this element 20
is extracted from the magazine 14.

45 is a disc fixed to the rotating shaft 40 of the pulse smoke 39, and this disc 45 has a notch 46 formed therein.

Reference numerals 47 and 48 indicate light emitting diodes, and 49 and 50 indicate phototransistors.These light emitting diodes 47, 48 and phototransistors 49 and 50 detect whether or not the sliding rod 42 has moved by a specified amount.

In FIG. 6, reference numeral 51 denotes a heating measurement section.Next, the structure of this heating measurement section 51 will be explained with reference to FIGS. 6, 7, and 8.

In FIG. 7, 52 is a plate-shaped main housing supported by support legs 53, 53', and guide rods 54, 54' are implanted in this main housing 52.

Reference numeral 55 denotes a plate-shaped sub-housing that is guided by the guide rods 54, 54' and overlapped with the main housing 52. This sub-housing 55 is fixed to the main housing 52 with screws 56, 56'.

57 and 58 are supports attached to the main housing 52, and the support 57 has the light emitting diodes 33 to 3.
5 is supported, and the phototransistors 36 to 38 are supported on the support body 58.

59 is a condenser tube fixed to the main housing 52, 60 is a heat lamp attached to this condenser tube 59, 61 is a photomultiplier tube provided in the sub housing 55, and 62 is a photomultiplier tube of this photomultiplier tube 61. The support piece 63 is attached to the housing 52.5.
A roller 64 is rotatably supported on this plate 63, and a coiled spring 6 is attached to this roller 64.
5 is wound.

Reference numeral 66 denotes a clamping rod that is slidably supported by a bearing 71 attached to the main housing 52. The coiled spring 65 is attached to the upper end of this clamping rod 66, and the coiled spring 65 causes the clamping rod 66 to move. It is biased downward.

A pulse motor 67 is fixed to the main housing 52, and a gear 69 is fixed to a rotating shaft 68 of the pulse smoke 67.

The pulse motor 67 serves as a driving source for extracting the card 9 from inside the case body 1 of the element 20 and transporting the card 9.

70 is a microswitch, and this microswitch 70 is turned OFF when the sub housing 55 is removed from the main housing 52, stopping the supply of high voltage to the photomultiplier tube 61. This prevents strong external light from entering the photomultiplier tube 61 and damaging the photomultiplier tube 61 when the housing 55 is removed.

Next, the internal structure of the heating measuring section 51 will be explained with reference to FIG. 8.

In FIG. 8, 72 is a vertical groove formed on the mounting surface side of the sub-housing 55 of the main housing 52, and 13 is this vertical groove 72.
The engagement release plate 73 is an engagement release plate fixed to the upper side of the element 20, and a protrusion 74 that is inserted into the notch 5 of the main body case 1 of the element 20 is formed on this engagement release plate 73.

75 is a lamp attached to the wall surface of the vertical groove 72.

76 is a horizontal groove formed in the main housing 52, and a card drive plate 77 is slidably supported in this horizontal groove 76.

T8 is an engaging protrusion formed at one end of the card driving plate 77, and this engaging protrusion 78 engages with the recess 13 of the card 9 of the element 20.

Reference numeral 79 denotes a filter attached to the card driving plate 77. This filter 79 is made of carbon film or the like and is used to check the power of the heating lamp 60.

Reference numeral 80 denotes a calibration light source attached to the card drive plate 77. This calibration light source 80 is a light source made of a self-luminous substance such as luminous paint, and is used to adjust the sensitivity of the photomultiplier tube 61 and the measurement circuit (not shown). Used for adjustment.

The distance between the filter 79 and the calibration light source 80 is a.

8L82, 83, 84.85 are small holes formed in the card drive plate TI.

Reference numeral 86 denotes a support metal fitting that supports the roller 87, and the roller 87 comes into contact with the card drive plate 77.

Reference numeral 88 denotes a member provided on the wall surface of the horizontal groove 76, and small holes 89, 90, 9L; 92 are formed in this member 88, and a phototransistor is attached thereto.

Next, the element 20 stored in the magazine 14 is extracted,
The outline of the operation of transferring to the heating measuring section will be explained with reference to FIG.

When the slide rod 42 rises, the push-up plate 44 provided at its tip is inserted into the hole 16 on the bottom of the magazine 14, and the element 2
0 from the magazine 14.

At this time, a clamping rod 66 urged by a coiled spring 65 comes into contact with the upper surface of the element 20, and the element 20 is held against the clamping rod 66.
It is transferred into the vertical groove 72 of the main housing 52 while being held between the push-up plate 44 and the push-up plate 44 .

When the element 20 is further moved upward, the element 20 comes into contact with the upper side of the vertical groove 72, and the information in the information reading section 7 of the element 20 is read here.

At this time, the protrusion 74 enters the cutout 5 of the element 20, and the engagement between the engagement claw 12 of the card 9 of the element 20 and the cutout 5 is released. engages the four parts 13 of the card 9.

Here, the card drive plate 77 is moved, the card 9 is pulled out, and inserted into the horizontal groove 76, and each thermoluminescent material 11 of the card 9 is sequentially transferred to the optical axis L of the heating measurement section and sequentially measured.

After the measurement is completed, the card 9 is stored in the case body 1 of the element 20, and the element 20 is lowered and stored in the magazine 14.

Next, details of each part in FIG. 8 will be explained in conjunction with FIGS. 9 to 13.

FIG. 9 shows a cross section taken along line A-A' in FIG.

In FIG. 9, 93 is a hole formed in the main housing 52, into which the lamp 75 is inserted.

94 is a printed circuit board for mounting the lamp 75;
Reference numeral 95 is a reflector plate of the lamp 75, 96 is a small hole formed in the sub-housing 55, and a light sensor 97 is arranged at the back of this small hole 96.

98 is a printed circuit board on which the optical sensor 97 is mounted.

The information reading section 7 of the element 20 is interposed between the lamp 75 and the optical sensor 97, and the optical sensor 9 detects whether the light from the lamp 75 reaches the optical sensor 97 through the hole 8 of the information reading section 7.
7, and various information can be read.

FIG. 10 shows a cross section taken along line B-B' in FIG.

A rib 99 is provided within the horizontal groove 76 formed in the main housing 52.
is formed, and the card 9 is transferred within the horizontal groove T6 at the top of the rib 99.

100 and 101 are holes formed in the main housing 52 and the sub housing 55, respectively;
A light emitting diode 102 and a phototransistor 1 are installed inside.
03 is inserted.

Note that the leftmost thermoluminescent material and the light emitting diode 102 in the initial position of the element 20 shown in FIG.
, the distance between the optical axes of the optical detection device consisting of the phototransistor 103 is b.

104 and 105 are printed circuit boards on which the light emitting diode 102 and phototransistor 103 are mounted.

The light emitting diode 102 and the phototransistor 103
By this, damage or presence of the thermoluminescent material 11 held on the card 9 is detected.

FIG. 17 shows the spacing between the filter 79, the calibration light source 80, the light emitting diode 102 constituting the optical detection device, and the thermoluminescent material 11 held in the force field 9 at the initial position of the element 20 shown in FIG. ing.

FIG. 11 shows a cross section taken along line C-C' in FIG.

In FIG. 11, reference numeral 59 is the light condensing tube, and a conical through hole 106 is formed in the condensing tube 59, and an infrared transmitting filter 10 is provided at one end of the through hole 106.
7 is installed.

60. is the heating lamp, and this heating lamp 60 is equipped with a reflecting mirror 108.

The heating lamp 60 is disposed at the other end opening of the condenser tube 59 and is pressed by a ring plate 110 via an O-ring 109.

Numeral 111 is a screw for integrally attaching the ring plate 110 and the condenser tube 59 to the main housing 52.

A seat 112 is attached to a hole in the sub-housing 55, and a light glass 113 is inserted into the center hole of the seat 112.

The photomultiplier tube 61 is screwed to the seat 112. In FIG. 11, the filter 79 provided on the card drive plate 77 is located between the infrared transmission filter 107 and the light glass 113. When the thermoluminescent material 11 held on the card 9 is transferred between the infrared transmitting filter 107 and the light glass 113, the thermoluminescent material 11 is heated by the light from the heating lamp 60, and the thermoluminescent material 11 is Get out.

This thermoluminescence is incident on the photomultiplier tube 61 via the light glass 113, and is converted into an electric current.

FIG. 12 shows a cross section taken along line D-D' in FIG.

In FIG. 12, 114 is a rack provided on the card drive plate 77. This rack 114 meshes with the gear 69, and the card drive plate 77 is slid by the rotation of the pulse motor 67.

FIG. 13 shows a cross section taken along line E-E' in FIG.

A phototransistor 115 is mounted within a member 88 attached to the main housing 52.

116 is a light emitting diode inserted into the hole 117 of the sub-housing 55, and 118 and 119 are printed circuit boards on which the phototransistor 115 and the light emitting diode 116 are mounted, respectively.

The light emitting diode 116 and the phototransistor 115
Accordingly, it is detected whether or not the card drive plate 77 is stopped at a predetermined position.

Next, the operation of the present invention will be explained.

6 and 8 show the magazine 14 inserted from the outside.

When the magazine 14 is inserted in this way, the magazine 14
The rack 19 and the gear 28 mesh with each other, and the light from the light emitting diode 33 is blocked by the magazine 14.
Insertion of the magazine 14 is detected by the phototransistor 36.

At this point, when the start switch (not shown) is closed,
The pulse motor 39 rotates a predetermined number of pulses, and the sliding rod 42
, push up the element 20 in the magazine 14, and push up the element 20 in the magazine 14.
0 into the vertical groove 72 of the main housing 52, and
(Fig. 14).

At this time, it is detected that the notch 46 of the disk 45 is rotated to be located between the light emitting diode 48 and the phototransistor 50, and that the element 20 has been pushed up to its normal position.

As shown in FIG. 14, when the element 20 is transferred to the upper end of the vertical groove 72, the protrusion 74 is inserted into the notch 5 of the element 20, and the engagement claw 12 of the card 9 and the notch 5 are engaged. comes off,
Furthermore, the engaging protrusion 78 of the card drive plate 77 engages with the recess 13 of the card 9.

Further, when the element 20 is transferred to the position shown in FIG. 14, the lamp 75 in FIG. 9 is turned on, and the information in the information reading section 7 of the element 20 is read by the optical sensor 97.

Next, the heating lamp 60 shown in FIG.
It is checked whether the heating is being performed normally.

Next, the pulse motor 6T shown in FIG. 12 rotates by the commanded number of pulses, and the card drive plate 77 moves to pull out the card 9 from the case body 1 and transfer the force card 9 into the horizontal groove 76. , the calibration light source 80 provided on the card driving plate 77 is moved to the optical axis L of the heating measurement position (FIG. 15).

At this time, the small hole 81 of the card drive plate 77 coincides with the small hole 91, and it is detected whether the card drive plate 77 has been correctly fed by the light emitting diode 116 and phototransistor 115 shown in FIG.

Note that while the card 9 is being transferred to the position shown in FIG. 15, the leftmost one of the plurality of thermoluminescent materials 11 provided on the power cord 9 is connected to the light emitting diode 102 shown in FIG. It passes between the phototransistor 103 and the presence or absence of this leftmost thermoluminescent material 11 and the presence or absence of damage are detected.

As shown in FIG. 15, when the calibration light source 80 reaches the optical axis L at the heating measurement position, the amount of light emitted from the calibration light source 80 is measured by the photomultiplier tube 61, and the sensitivity of the photomultiplier tube 61 is checked. It is done.

Next, when the pulse motor 67 rotates by the commanded number of pulses, as shown in FIG. Position it on the optical axis L of the measurement position.

At this time, the small hole 82 of the card drive plate 77 matches the small hole 91, and it is detected whether the card drive plate 77 has been transferred correctly.

Furthermore, while the card drive plate 77 is being transferred to the position shown in FIG.
It is detected by a light emitting diode 102 and a phototransistor 103 shown in FIG.

In the state shown in FIG. 16, the heating lamp 60 is turned on and the leftmost thermoluminescent material 11 of the card 9 is heated, and the thermoluminescent material 11 emits thermoluminescence through the light glass 113 shown in FIG. The radiation enters the photomultiplier tube 61, is converted into a current, this current is integrated, and the integrated value is detected to measure the radiation exposure dose.

In this way, when the measurement of the leftmost thermoluminescent material 11 of the card 9 is completed, the card drive plate 77 is further transferred, and the second thermoluminescent material 11 from the left is located on the optical axis L, and similarly Exposure dose is measured.

In this case, the small hole 83 and the small hole 91 of the card driving plate 77 detect whether or not the card driving plate 77 has been transferred normally. Presence and presence of damage are detected.

Similarly, the third and fourth thermoluminescent materials 11 are sequentially measured.

When the measurement of the four thermoluminescent materials 11 on the card 9 is completed, the pulse motor 67 reversely rotates by the commanded number of pulses, returning the card drive plate 77 and the card 9 to the state shown in FIG. It is stored inside the case body 1.

At this time, it is detected that the small hole 92 is unshielded by the card drive plate 77 and the card drive plate 77 has returned to its normal position.

In addition, even during the return, the thermoluminescent material 1 is
1 is detected.

Next, the pulse motor 39 shown in FIG. 6 rotates by the commanded number of pulses to lower the sliding rod 42 and move the element 20
It is lowered to the position shown in the figure and stored in the magazine 14.

At this time, the notch 46 of the disc 45 attached to the rotating shaft 40 of the pulse motor 39 rotates to the optical axis of the light emitting diode 47 and the phototransistor 49, and the sliding rod 42 descends to its normal position. is detected.

Next, the pulse motor 31 rotates by the commanded number of pulses to move the magazine 14 forward by one pitch.

At this time, one hole 30 of the disc 29 attached to the rotating shaft 27 of the pulse motor 31 is located on the optical axis of the light emitting diode 31 and the phototransistor 32, and it is detected that the magazine 14 has been fed at a regular pitch. be done.

Thereafter, the second, third, etc. elements 20 are sequentially measured in the same manner as above, and when the measurement of the last element 20 is completed, the rear end of the magazine 14 is connected to the light emitting diode 34 and the phototransistor 37. It is detected that the magazine 14 has moved to the final position, and the pulse motor 2
6 rotates in the opposite direction, and the magazine 14 is driven by the pulse motor 26 until the magazine 14 is removed from the optical axis of the light emitting diode 33 and the phototransistor 36, that is, until the gear 28 and the rack 19 of the magazine 14 are removed. It is.

By taking this magazine 14 out and inserting another magazine in the same way, it is possible to measure a large number of elements in the same way.

FIG. 17 shows that the card drive plate 77 and the element 20 are
The spacing between the filter 79, the calibration light source 80, the light emitting diode 102 and the thermoluminescent material 11 held on the card 9 within the element 20 is shown when in the position shown.

In this state, the filter 79 is located on the optical axis L of the heating device and the photomultiplier tube, and the light emitting diode 1
The distance from 02 is p (2 + 0.5), and expressed in the general formula p (n + 0.5), n = o, 1, 2, 3...
...becomes.

Also, the spacing between the filter 19 and the calibration light source 80 is adjusted to the distance between the a1 light emitting diode 102 and the leftmost thermoluminescent material 1
If the interval from 1 is b, then a=b+p(0+0.5)
, and when expressed in the general formula, a = b + p (n + 0.5
), n=0, 1, 2, 3...

When the above relationship is satisfied, when the card driving plate 77 is intermittently transferred and the calibration light source 80 or the thermoluminescent material 11 is located on the optical axis L, the light emitting diode 102 is located between the thermoluminescent materials 11. Therefore, during each intermittent operation of the card drive plate 77, each thermoluminescent material 1
1 and the presence or absence of damage are detected by an optical detection device consisting of a light emitting diode 102 and a phototransistor 103.

Conventionally, in this type of thermoluminescent dosimeter, the following steps are required: transferring a card to detect the presence or absence of the thermoluminescent material 11 and the presence or absence of damage, checking the power of the heating lamp 60, and calibrating the photomultiplier tube 61 and the measuring circuit using a light source. In contrast to the inefficient transportation of cards for sensitivity adjustment and thermoluminescence measurement, which were performed separately, according to the present invention, all of the above operations can be completed by simply transporting the card once. A series of operations can be performed very efficiently.

Recently, in this type of thermoluminescent dosimeter element, in order to shorten the heating measurement time, there is a tendency to provide a sheet within the hole 10 of the card 9 and to thinly disperse and fix the thermoluminescent material 11 to this sheet.

However, due to this thinner profile, it becomes more susceptible to damage due to mechanical external force or burnout due to heat, and if the heating lamp 6 is transferred to the heating measuring section in a damaged or burnt state,
There is a risk that the light from 0 passes through the hole 10 of the card 9 and enters the photomultiplier tube 61, deteriorating the sensitivity of the photomultiplier tube 61, and if it burns out during measurement, it may be a defective element. It may even force the wearer to use the product.

For this reason as well, detection of the presence or absence of thermoluminescent material and its damage is essential.

As described above, according to the present invention, it is possible to check whether or not the thermoluminescent material is present or damaged, check the heating power, adjust the thermoluminescence detection sensitivity, and measure the thermoluminescence by just transferring the card once, which is extremely efficient. It has the advantage that a good thermoluminescent dosimeter can be constructed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a thermoluminescent dosimeter element used in the thermoluminescent dosimeter of the present invention, FIG. 2 is an exploded perspective view of the same, FIG. 3 is a top view of a magazine containing the thermoluminescent dosimeter element, and FIG. The figures are a sectional view taken along the line AA' in FIG. 3, FIG. 5 is a sectional view taken along the line BB' in FIG. 3, FIG. 6 is a schematic diagram of a thermoluminescence dosimeter according to an embodiment of the present invention, and FIG. is a perspective view of the heating measurement part of the thermoluminescence dosimeter, FIG. 8 is a cross-sectional view of the main part of the thermoluminescence dosimeter, FIG. 9 is a cross-sectional view taken along the line A-N in FIG. 8, and FIG. BB'
11 is a sectional view taken along line c-c' in FIG. 8, FIG. 12 is a sectional view taken along line DD' in FIG. 8, and FIG. 13 is a sectional view taken along line EE in FIG.
14 is a sectional view of the main part of the thermoluminescence dosimeter when the element is transferred, and Figs. 15 and 16 are sectional views of the main part of the thermoluminescence dosimeter when the card is transferred, respectively.
FIG. 17 is a diagram showing the positional relationship of each part in the state shown in FIG. 14. 1...Case body, 5...Notch, 7
...Information reading section, 8...hole, 9...
... Card, 11 ... Thermoluminescence material, 12 ... Engagement claw, 13 ... Recess, 1
4... Magazine, 19... Rack, 2
0...Element, 26...Pulse motor,
27...Rotating shaft, 28...Gear, 29
... Disc, 30 ... Hole, 31 ...
...Light-emitting diode, 32...Phototransistor, 33-35...Light-emitting diode, 36-
38...Phototransistor, 39...
・Pulse motor, 40...Rotary axis, 41...
...Gear, 42...Sliding rod, 43...
- Rack, 45...Disc, 46...Notch, 47.48...Light emitting diode, 49.
50...Phototransistor, 51...
・Heating measurement section, 52...Main housing, 55.
... Sub-housing, 60 ... Heat lamp, 61 ... Photomultiplier tube, 65 ... Coiled spring, 66 ... Holding rod , 67...
・Pulse motor, 68... Rotating shaft, 69...
...Gear, 72...Vertical groove, 73...
Engagement release plate, 74...Protrusion, 76...
Horizontal groove, 77...Card drive plate, 78...
・Engagement protrusion, 79...Filter, 80...
...Calibration light source, 81-85...Small hole, 89-
92...Small hole, 106...Through hole, 1
07...Infrared transmission filter.

Claims (1)

[Claims] 1. A card holding a plurality of thermoluminescent materials at regular intervals p, a card drive plate that is slidably supported within a housing and that transports the card, and a card driving plate that is provided in the housing and that heats the thermoluminescent element. a heating means for heating, a thermoluminescence detecting means for detecting thermoluminescence emitted from the thermoluminescent material, which is also provided in the housing, a calibration light source, which is provided in the drive plate and is composed of a self-luminous substance; a filter provided in the housing to generate infrared rays with an intensity corresponding to the heating intensity of the heating means; and an optical detection means provided in the housing to detect the presence or absence of a thermoluminescent material in the card and the presence or absence of damage; The optical axis of the thermoluminescence detection means and the optical axis of the above-mentioned optical detection means are separated by an interval p (n + 0.5) (where n = 0, 1, 2, 3...
・) The above filter and the calibration light source are placed at a distance of a
and when the filter is located at the optical axis position of the thermoluminescence detection means, and b is the distance between the optical axis of the optical detection means and the thermoluminescence material located at the end of the card, a= b ten p (n + 0.5) (however, n
=o, 1t2, 3...) A thermoluminescence dosimeter in which a, b, and p are respectively set to have the following relationships.