JP2004239919A - Body surface monitor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the detection ability and to deal with the measurement for various body heights in the body surface monitor to detect the radioactive contamination on the body surface. <P>SOLUTION: The measuring room 18 has a diamond form in depth as a whole. Therefore, the radiation detector can be brought close to a measured person's head and his lower part. The hand detection unit 26 has a penetration slot so that a hand is inserted into it to detect the hand radioactive contamination. For example, the topmost radiation detector S4 can be inclined further according to a measured person's height. Moreover, the radiation detector prepared in the bridgewall 30 can be made into a double-sided detection type radiation detector. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to a body surface monitor, and more particularly, to a structure of a body surface monitor.

  The body surface monitor functions as a body surface radiation measuring device, which is installed in, for example, a nuclear power plant, a nuclear fuel processing facility, or the like. That is, a body surface monitor is installed at the entrance of the radiation control area, and radiation is measured for workers who enter the radiation control area and who leave the radiation control area for controlling their exposure.

  A conventional body surface monitor generally includes a main body, an entrance door, an exit door, and the like. Conventionally, when the entrance door is in the open state and the exit door is in the closed state, the worker enters the measurement room, in which the worker turns 90 degrees, and the right and left hands formed on the front face are turned. Insert your hand into the measuring unit. In that state, the entrance door is closed and radiation is measured for a predetermined time. After the measurement is completed, the exit door is opened, and the worker leaves the measurement room. Then, the exit door is closed and the entrance door is opened. This process is repeated for each worker. In addition, Japanese Patent No. 2807168 discloses a body surface monitor that can perform measurement without changing the direction in a measurement room.

  In a conventional body surface monitor, a measurement chamber as a cavity has a box shape or a rectangular shape. A plurality of planar radiation detectors are arranged on the inner surface. On the other hand, a human body in a standing state roughly has an outer shape whose middle part is expanded and whose top and bottom are narrowed. Therefore, when measuring the worker in the measurement room, the upper and lower parts of the worker tend to separate from the radiation detector. As a result, a problem such as a decrease in detection efficiency or sensitivity occurs.

  Some body surface monitors have a head detector that moves up and down to accommodate workers of various heights. However, there is a problem that when the heavy head detector is further vertically lowered and positioned near the head in the state of being confined in the measurement room, a considerable psychological oppression is generated.

  Further, in order to cope with various heights, it is desired to raise and lower the hand detector in accordance with the height, but in that case, there is a problem that the device configuration becomes complicated.

  Further, it is desired to measure the radiation in a state facing the inner surface of the exit door without changing the direction in the measurement room. In this case, it is difficult to arrange two hand detectors at the exit door. There is a problem.

Microfilm of Japanese Utility Model Application No. 58-188323 (Japanese Utility Model Application No. 60-95567) JP-A-8-248134 JP-A-6-180366

  An object of the present invention is to improve detection sensitivity in a body surface monitor.

  Another object of the present invention is to eliminate the feeling of psychological pressure as much as possible.

  It is another object of the present invention to be able to accommodate subjects of various heights.

  Another object of the present invention is to reduce the apparatus cost.

(1) In a preferred embodiment, a main body having a cavity penetrating from an entrance opening to an exit opening, the cavity functioning as a measurement chamber for accommodating a subject, and an openable / closable entrance provided in the entrance opening A door, an openable / closable exit door provided at the exit opening, and a cover provided on the main body, the entrance door, and the exit door, and placed in a standing position facing the exit door in the measurement chamber. A plurality of radiation detectors for detecting radiation from the body surface with respect to the measurer, wherein the measurement chamber has a configuration in which the left and right widths of at least one of an upper portion and a lower portion are smaller than the left and right widths of an intermediate portion. It is characterized by having.

  According to the above configuration, at least one of the upper part and the lower part of the measurement chamber has a form narrowed inward, so that the radiation detector can be brought closer to the body surface. Therefore, the sensitivity can be improved. The shape of the measurement chamber is determined so as to cover various heights and various body types. The entrance door and the exit door may be one door or two doors. In the latter case, it is desirable to adopt the double door system.

  Preferably, the left-right width of the upper part of the measurement chamber is gradually narrowed upward. Preferably, the left and right width of the lower portion of the measurement chamber is gradually narrowed downward. Preferably, the cavity as the measuring chamber has a substantially rhombic shape as a whole. The rhombus shape is a reasonable form that allows the inner surfaces of the measurement chamber to be close to the surface of the human body while covering the external shapes of the human body of various sizes. In addition, the rhombic shape has a softness in shape itself as compared with a simple rectangular shape, and the feeling of intimacy is easily generated, so that an effect of reducing the feeling of oppression can be expected.

  Desirably, the main body includes a right upper surface facing the measurement chamber, a right lower surface, a left upper surface, a left lower surface, and a floor surface, and the plurality of radiation detectors include a right upper radiation detector provided on the right upper surface. A lower right radiation detector provided on the lower right surface, an upper left radiation detector provided on the upper left surface, a lower left radiation detector provided on the lower left surface, and provided on the floor surface Floor radiation detector, the back radiation detector provided on the inner surface facing the measurement room of the entrance door, and the front radiation detector provided on the inner surface facing the measurement room of the exit door, included. The radiation detector may be constituted by a plurality of sensor units, or two radiation detectors may be constituted by one sensor unit.

  Preferably, there is provided a posture varying means for varying the posture of at least one radiation detector according to the height of the person to be measured. Preferably, at least one of the upper right radiation detector and the upper left radiation detector tilts into the measurement room according to the height of the subject. Preferably, the upper right radiation detector and the upper left radiation detector perform a tilting movement with the lower side as a rotation axis. When the position of the head is lowered, it is desirable to improve the detection sensitivity by changing the attitude of the upper radiation detector according to the height of the subject whose distance from the radiation detector to the head decreases.

  Preferably, the main body communicates with the measurement chamber, and a groove for a right hand into which the right hand of a subject accommodated in the measurement chamber is inserted from above, and communicates with the measurement chamber and is housed in the measurement chamber. A left-hand groove into which the left hand of the person to be measured is inserted from above is formed, and the plurality of radiation detectors include a right-hand radiation detector that detects radiation from the right hand inserted into the right-hand groove. And a left-handed radiation detector for detecting radiation from the left hand inserted into the left-handed groove.

  According to the above configuration, the radiation is measured by inserting the hands into the grooves provided on the left and right sides of the person without raising both hands forward from both shoulders. In a general body type, the angle to open the upper arm differs according to the height, and the length of the hand increases according to the height, so even if the height of the two grooves is fixed, various Can respond to height.

(2) In a preferred embodiment, a main body having a cavity penetrating from the entrance opening to the exit opening, the cavity functioning as a measurement chamber for accommodating the subject, and an openable / closable entrance provided in the entrance opening A door, an openable / closable exit door provided at the exit opening, and a cover provided on the main body, the entrance door, and the exit door, and placed in a standing position facing the exit door in the measurement chamber. A plurality of radiation detectors for detecting radiation from the body surface for the measurer, and at least one of the plurality of radiation detectors is directed to the measurement room side according to the height of the subject. It is characterized in that the inclination can be changed.

  According to the above configuration, it is possible to improve the detection sensitivity by changing the posture of the radiation detector according to the height and the body shape. The data such as height may be read from a card carried by the subject, or a height sensor may be provided near the entrance opening or in the measurement room.

  Desirably, the inner surface of the main body includes a right upper surface, a right lower surface, a left upper surface, a left lower surface, and a floor surface, and the plurality of radiation detectors include an upper right radiation detector provided on the right upper surface, A radiation detector for lower right provided on the lower right surface, a radiation detector for upper left provided on the upper left surface, a radiation detector for lower left provided on the lower left surface, and a floor provided on the floor surface And a surface radiation detector.

  Desirably, at least one of the upper right radiation detector and the upper left radiation detector performs a tilting movement about a lower side as a rotation axis. According to this configuration, the radiation detectors for the upper right and / or the upper left are retracted or in the original posture when measuring a person with a high height, and when measuring a person with a short height, the radiation detectors are located on the measurement room side. And the distance to the head becomes shorter.

(3) In a preferred embodiment, a main body having a cavity penetrating from an entrance opening to an exit opening, the cavity functioning as a measurement chamber for accommodating a subject, and an openable / closable entrance provided in the entrance opening A door, an openable / closable exit door provided at the exit opening, and a cover provided at the main body, the entrance door, and the exit door, and placed in a standing position facing the exit door in the measurement chamber. A plurality of radiation detectors for detecting radiation from the body surface of the person to be measured, and the main body communicates with the measurement room, and the right hand of the person to be measured housed in the measurement room is inserted from above. And a left-hand groove that communicates with the measurement chamber and into which the left hand of the person to be measured housed in the measurement chamber is inserted from above, and the plurality of radiation detectors includes the right-hand groove. Right hand inserted into the groove A right-hand radiation detector for detecting et radiation, and left for a radiation detector for detecting radiation from the left hand inserted into the left groove, characterized in that it is included.

  Preferably, the right-hand groove and the left-hand groove are grooves that penetrate in the direction in which the cavity passes. If the groove penetrates, the feeling of anxiety and pressure during insertion can be reduced. The penetrated groove is desirably covered by both doors during measurement.

(4) In a preferred embodiment, a main body having a cavity penetrating from an entrance opening to an exit opening, the cavity functioning as a measurement chamber for accommodating a subject, and an openable / closable entrance provided in the entrance opening A door, an openable / closable exit door provided at the exit opening, and a cover provided at the main body, the entrance door, and the exit door, and placed in a standing position facing the exit door in the measurement chamber. A plurality of radiation detectors for detecting radiation from the body surface of the person to be measured, and the main body communicates with the measurement room, and the right hand of the person to be measured housed in the measurement room is inserted from above. And a left-hand groove that communicates with the measurement chamber and into which the left hand of the person to be measured housed in the measurement chamber is inserted from above, and the plurality of radiation detectors includes the right-hand groove. Between the groove and the measuring chamber A right-sided double-sided radiation detector provided on the right partition wall and capable of detecting radiation on both surfaces, and a left-side partition wall provided between the left-hand groove and the measurement chamber, capable of detecting radiation on both surfaces. And a double-sided radiation detector for the left side.

  According to the above configuration, the thickness of the partition wall can be reduced, or radiation can be reliably detected. Further, there is an advantage that the apparatus cost is reduced.

(5) The present invention includes a main body having a cavity penetrating from an entrance opening to an exit opening, the cavity functioning as a measurement chamber for accommodating a subject, an entrance door provided at the entrance opening and capable of opening and closing, An openable and closable exit door provided at the exit opening, the main body, the entrance door and the exit door, provided for the subject placed in a standing position in the measurement chamber, radiation from the body surface. A plurality of radiation detectors for detecting, the main body communicates with the measurement chamber, a right-hand groove into which the right hand of the person to be measured housed in the measurement chamber is inserted from above, And a left-hand groove into which the left hand of the subject housed in the measurement chamber is inserted from above, and the plurality of radiation detectors are provided with radiation from the right hand inserted into the right-hand groove. With a right-handed radiation detector to detect And left for a radiation detector for detecting radiation from the left hand inserted into the left groove, characterized in that it is included.

  Preferably, the subject enters the measurement room, faces the exit door, and measures the radiation in that state without changing its direction. Preferably, the right-hand groove and the left-hand groove are grooves that penetrate in the direction in which the cavity passes. Desirably, as the right-hand radiation detector, a right-hand one-side radiation detector provided on one side of the right-hand groove, a right-hand other-surface radiation detector provided on the other side of the right-hand groove, , Provided, as the left-handed radiation detector, a left-handed one-sided radiation detector provided on one side of the left-handed groove, and a left-handed other-side radiation detection provided on the other side of the left-handed groove And a vessel. Preferably, each of the radiation detectors is a planar radiation measuring device having a scintillator plate.

  The present invention has a cavity penetrating from an entrance opening to an exit opening, and the cavity functions as a measurement chamber for accommodating a subject, an openable / closable entrance door provided at the entrance opening, and the exit An openable and closable exit door provided at an opening, and the main body, the entrance door and the exit door are provided, and the radiation from the body surface is detected for the subject placed in an upright position in the measurement room. A plurality of radiation detectors, and the main body communicates with the measurement chamber, and a groove for a right hand into which the right hand of a subject accommodated in the measurement chamber is inserted from above, and the main body communicates with the measurement chamber. And a left-hand groove into which the left hand of the person to be measured housed in the measurement chamber is inserted from above, and the plurality of radiation detectors include a right-hand groove between the right-hand groove and the measurement chamber. Provided on the partition wall, radiation on both sides A right-sided double-sided radiation detector capable of exiting, and a left-sided double-sided radiation detector provided on the left partition wall between the left-hand groove and the measurement chamber and capable of detecting radiation on both sides, It is characterized by being included. Preferably, the subject enters the measurement room, faces the exit door, and measures the radiation in that state without changing its direction.

  As described above, according to the present invention, the detection sensitivity can be improved. According to the present invention, a feeling of psychological oppression can be reduced. According to the present invention, various heights can be accommodated.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a preferred embodiment of a body surface monitor according to the present invention, and FIG. 1 is a schematic perspective view thereof.

  The body surface monitor shown in FIG. 1 is installed at, for example, a nuclear power plant. Specifically, the body surface monitor is provided at an entrance of a radiation control area, and measures body surface contamination of workers entering and leaving the area. It is a device to do.

  The body surface monitor is roughly divided into a main body 10, an entrance door 12, an exit door 14, and a base 16. The main body 10 has a measurement chamber 18 as a cavity formed from the inlet opening to the outlet opening. In FIG. 1, the Y direction is a direction in which the worker moves, the X direction is a left-right direction with respect to the worker, and the Z direction is a height direction.

  The measurement chamber 18 as a cavity is roughly divided into three parts. That is, it is divided into an upper portion 18H, an intermediate portion 18M, and a lower portion 18L. As shown in FIG. 1, the middle portion 18M is wider in the X direction, the upper portion 18H is gradually narrower in the X direction upward, and the lower portion 18L is narrower in the X direction downward. It is gradually narrowing. Therefore, the measurement chamber 18 has a generally vertically long rhombus shape as a whole when viewed from the entrance side. This rhombus shape is a shape corresponding to the height and body shape of the worker which is assumed substantially, and is a form in which a radiation detector described later can be brought as close to the body surface as possible.

  In the measurement chamber 18, a pair of hand detection units 26 are provided at the left and right ends in the X direction of the intermediate portion 18M. The hand detection unit 26 has a groove 28 as a vertical groove or a V-shaped groove communicating with the measurement chamber 18. This groove 28 is a groove penetrating in the Y direction. The right hand or the left hand is inserted into the groove 28, and the radiation of the hand is measured in this state. A partition wall 30 is formed between the groove 28 and the intermediate portion 18M. The partition wall 30 is provided with a radiation detector S10 facing the groove 28. Further, a radiation detector S11 is provided on an inner surface of the groove 28 facing the radiation detector S10. These radiation detectors S10 and S11 and each of the radiation detectors described later are planar radiation detectors, and specifically include a scintillator plate and a plurality of photomultiplier tubes.

  The main body 10 is formed with two upper inner surfaces 22 and two lower inner surfaces 24 as surfaces facing the measurement chamber 18. The upper inner surface 22 is inclined at a constant angle toward the measurement chamber 18 side, and the lower inner surface 24 is also inclined at a constant angle while opening upward.

  Therefore, as described above, the measurement chamber 18 has a vertically long diamond shape as a whole. The measurement room 18 further has a ceiling surface and a floor surface, and the floor surface is provided with a radiation detector S9 for measuring radioactive contamination of the feet. At the time of measurement, the worker stands upright on the floor surface, and measures the radiation with both hands inserted into the respective hand detection units 26.

  Describing the radiation detector further, in the present embodiment, the entrance door 12 is provided with three radiation detectors S1 to S3 from above to below. Further, two radiation detectors S4 and S5 are provided on the two upper inner surfaces 22 so as to be vertically arranged. Further, two radiation detectors S6 and S7 are provided on the two lower inner surfaces 24, respectively, which are vertically arranged.

  Of course, the arrangement of the radiation detectors is an example, and various arrangement methods can be used. However, it is desirable to arrange each radiation detector so that body surface contamination can be measured over the entire body of the worker who is the subject.

  FIG. 2 shows a schematic cross section of the body surface monitor shown in FIG. 1 as viewed from above. In the configuration shown in FIG. 2, 18A indicates an inlet opening, and 18B indicates an outlet opening. Each opening is provided with the above-described entrance door 12 and exit door 14. In FIG. 2, the center of rotation of the entrance door 12 is set on the left side when viewed from the approach direction, but may be on the right side as a matter of course. Similarly, the center of rotation of the exit door 14 is formed on the right side from the entrance, but may be on the left side. Further, the door 12 may be a double door system in which the entrance door 12 and the exit door 14 open in the left-right direction from the center. In any case, by substantially concealing the two openings 18A and 18B in the measurement chamber 18 with these doors 12 and 14, background noise can be reduced and highly accurate body surface contamination detection can be performed. In FIG. 2, the doors 12 and 14 do not have a length that covers the entire hand detection unit 26, but a larger door is installed, and the entire hand detection unit 26 is It may be covered by.

  Returning to FIG. 1, in the present embodiment, the height of the apex of the partition wall 30 is set within a range of, for example, 90 to 100 cm from the floor surface, and is desirably 95 cm. The distance between the centers of the two grooves 28 is, for example, 60 to 120 cm, preferably 90 cm. Further, the depth of the groove 28 is, for example, 30 to 45 cm, preferably 40 cm. Further, the height from the floor surface to the ceiling surface is, for example, 2 m, but of course, other values may be adopted. The angle of inclination of the upper inner surface 22 from the vertical is, for example, 0 to 80 °, and preferably 35 °. The open inclination angle of the lower inner surface 24 is, for example, 0 to 20 °, and preferably 10 °. However, each of the numerical values described above is an example, and other values can be adopted. For example, all or a part of the lower inner surface 24 may be a vertical surface. In addition, the whole or a part of the upper inner surface 22 may be a vertical surface, and the inclination angle may be set in two or more steps. Ultimately, it is also possible to configure the measurement chamber 18 as a vertically long elliptical shape. However, according to the embodiment of the present invention, it has a relatively simple form and can perform efficient measurement, and thus has practical value.

  Next, the operation will be described. First, with the exit door 14 closed, an operator enters the inside of the measurement chamber 18 from the entrance opening side and stands on the floor. In this state, the worker faces the inner surface of the exit door 14. In this state, both hands are inserted into the two hand detection units 26. Prior to the start of the measurement, the entrance door 12 is closed. Then, the radiation measurement is performed for a predetermined time from the time of the closing.

  When the radiation measurement is completed, only the exit door 14 is opened, so that the operator can exit forward. Thereafter, the exit door 14 is closed, and the entrance door 12 is opened, and the same steps are repeated and executed. Therefore, the worker as the person to be measured does not need to change his or her direction inside the measuring chamber 18, so that the measuring time per person can be reduced. In addition, especially in the upper and lower parts of the worker, the radiation detector is close to the body surface, so that the detection sensitivity can be increased. Further, since the measuring chamber 18 shown in FIG. 1 has a rhombic shape, and the measuring chamber 18 is configured with a certain height, almost all workers are accommodated and the radiation measurement is performed. It is possible.

  In the body surface monitor of the present embodiment, hand detection units 26 are fixedly provided at both left and right ends of the measurement chamber 18. However, the length of the hand is roughly proportional to the height, and such a fixed arrangement does not cause any particular problem. Moreover, in general, in the case of a tall person, two hands can be inserted into the hand detection unit 26 without opening the two upper arms so much. Will open the two upper arms to some extent and insert the two hands into the hand detection unit 26, so that the difference in the arm length and the height difference due to such an opening of the upper arms or the difference in the bending angle of the joints. Can be absorbed or adjusted. For this reason, even if the hand detection unit 26 is fixedly arranged, radiation measurement for both hands can be reliably performed according to various heights. However, if necessary, the hand detection unit 26 may be vertically movable.

  FIG. 3 shows another embodiment of the body surface monitor. In FIG. 3, the measurement chamber has a rhombic shape as a whole, which is the same as the configuration shown in FIG. In the embodiment shown in FIG. 3, a radiation detector S20 of a double-sided detection type is provided in the partition wall 30. That is, the radiation detector S20 has scintillator plates on both one side and the other side, and detects the light emission generated by the scintillator plates by one or more photomultiplier tubes. If two independent radiation detectors are provided on the partition wall 30, the partition wall 30 becomes unnecessarily thick or the arrangement itself becomes difficult. According to the present embodiment, such a double-sided detection is performed. The above problems can be solved by using a radiation detector of the type.

  Further, in the embodiment shown in FIG. 3, the two radiation detectors S4 provided at the top are configured to be able to change the inclination. For this purpose, an inclination mechanism 32 as a posture variable mechanism is provided. When the height of the worker as the subject is short, the tilt mechanism 32 is operated, and the tilt angle of the radiation detector S4 is increased. Thereby, the main sensitivity direction can be matched to the head of the subject as much as possible, so that the detection sensitivity can be increased. Of course, such an inclination angle is desirably set according to the height of the worker, or when the height is lower than a certain value, the radiation detector S4 may be inclined. When the height of the worker is high, the radiation detector S4 is returned to the original angle, and radiation measurement is performed in that state.

  In the embodiment shown in FIG. 3, only the uppermost two radiation detectors S <b> 4 are adjusted in their postures. However, it is needless to say that the postures of the other radiation detectors can be changed according to their height or body type. You may. In any case, the detection efficiency can be increased by bringing the radiation detector as close to the body surface as possible.

  Incidentally, in the embodiment shown in FIG. 3, the surface corresponding to the lower inner surface shown in FIG. 1 is constituted by the vertical surface and the inclined surface, but the rhombic shape is maintained in the entire measurement chamber.

  In the above description, the two radiation detectors S4 are equally inclined, but only one of them may be inclined. For example, if one of the radiation detectors S4 is tilted so as to be parallel (horizontal) with respect to the floor surface, the detection sensitivity of the head can be increased for a shorter person.

1 is a schematic perspective view showing a preferred embodiment of a body surface monitor according to the present invention. FIG. 2 is a cross-sectional view of the body surface monitor shown in FIG. 1. It is the schematic which shows the structure of the body surface monitor which concerns on other embodiment.

Explanation of reference numerals

  10 body, 12 entrance door, 14 exit door, 18 measurement room (cavity), 26 hand detection unit, 28 grooves, S1 to S11, S20 radiation detector.

Claims (7)

A main body having a cavity that penetrates from the entrance opening to the exit opening, and the cavity functions as a measurement chamber for accommodating the subject;
An openable and closable entrance door provided at the entrance opening,
An exit door provided at the exit opening and capable of opening and closing,
The main body, provided on the entrance door and the exit door, a plurality of radiation detectors for detecting radiation from the body surface, for the subject placed in an upright state in the measurement room,
Including
In the main body,
A right-hand groove, into which the right hand of the person to be measured housed in the measurement chamber is inserted from above, communicating with the measurement chamber;
A left-hand groove into which the left hand of the subject accommodated in the measurement chamber is inserted from above, communicating with the measurement chamber;
Is formed,
The plurality of radiation detectors,
A right-hand radiation detector for detecting radiation from the right hand inserted in the right-hand groove,
A left-hand radiation detector for detecting radiation from the left hand inserted in the left-hand groove,
A body surface monitor characterized by including: The body surface monitor according to claim 1,
A body surface monitor, wherein a subject entering the measurement room faces the exit door, and the radiation is measured in that state without changing its direction. The body surface monitor according to claim 2,
The body surface monitor, wherein the right-hand groove and the left-hand groove are grooves that penetrate in the penetrating direction of the cavity. The body surface monitor according to claim 1,
As the right-hand radiation detector, a right-hand one-side radiation detector provided on one side of the right-hand groove, and a right-hand other surface radiation detector provided on the other side of the right-hand groove are provided. And
As the left-handed radiation detector, a left-handed one-sided radiation detector provided on one side of the left-handed groove and a left-handed other-sided radiation detector provided on the other side of the left-handed groove are provided. Body surface monitor characterized by having been done. The body surface monitor according to claim 1,
The body surface monitor, wherein each of the radiation detectors is a planar radiation measuring device having a scintillator plate. A main body having a cavity that penetrates from the entrance opening to the exit opening, and the cavity functions as a measurement chamber for accommodating the subject;
An openable and closable entrance door provided at the entrance opening,
An openable and closable exit door provided at the exit opening,
The main body, provided on the entrance door and the exit door, a plurality of radiation detectors for detecting radiation from the body surface, for the subject placed in an upright state in the measurement room,
Including
In the main body,
A right-hand groove, into which the right hand of the person to be measured housed in the measurement chamber is inserted from above, communicating with the measurement chamber;
A left-hand groove into which the left hand of the subject accommodated in the measurement chamber is inserted from above, communicating with the measurement chamber;
Is formed,
The plurality of radiation detectors,
A right-sided double-sided radiation detector that is provided on a right partition wall between the right-hand groove and the measurement chamber and can detect radiation on both sides,
A left-sided double-sided radiation detector that is provided on the left partition between the left-hand groove and the measurement chamber and can detect radiation on both sides,
A body surface monitor characterized by including: The body surface monitor according to claim 1,
A body surface monitor, wherein a subject entering the measurement room faces the exit door, and the radiation is measured in that state without changing its direction.

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