JP2003215250A - Body surface monitor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a body surface monitor which detects radioactive contamination on a body surface capable of improving detection sensitivity and coping with subjects of various heights. <P>SOLUTION: A measurement chamber 18 has a vertical diamond-shape as a whole. So, a radiation detector can approach the head of a subject, and it can approach the lower part of the subject. A hand is inserted in a hand-part detecting unit 26, where measurement is performed for radiation. A top radiation detector S4, for example, may be further tilted according to body height. A radiation detector installed in a partition wall 30 may be both-sided detector type. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a body surface monitor, and more particularly to the structure of a body surface monitor.

[0002]

2. Description of the Related Art A body surface monitor functions as a radiation measuring device for body surface, and it 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 / exit of the radiation controlled area, and the radiation is measured for the radiation exposure control for the worker who enters the radiation controlled area and the worker who leaves the radiation controlled area.

A conventional body surface monitor is generally composed of a main body, an entrance door, an exit door and the like. Conventionally,
With the entrance door open and the exit door closed, the worker enters the measurement room, the worker turns 90 degrees inside the measurement room, and the right-hand and left-hand measurement units are formed in front of the measurement unit. Insert your hand into. In that state, the entrance door is closed and the radiation is measured for a predetermined time. After the measurement is completed, the exit door is opened and the worker exits the measurement room. Then, the exit door is closed and the entrance door is opened again. This process is repeated for each worker. It should be noted that Japanese Patent No. 2807168 discloses a body surface monitor that can perform measurement in the measurement chamber without changing its orientation.

In the conventional body surface monitor, the 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 thereof. On the other hand, a human body in an upright position has a contour that roughly swells at its middle portion and is squeezed at the top and bottom. Therefore,
When the measurement of the worker is performed in the measurement room, the upper and lower parts of the worker are apt to be separated from the radiation detector. As a result, there arises a problem that the detection efficiency or the sensitivity is lowered.

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

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

Further, it is desirable to measure the radiation while facing the inner surface of the exit door without changing the direction in the measurement chamber. In that case, two hand detectors should be arranged on the exit door. Has the problem of being difficult.

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

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

Another object of the present invention is to be able to deal with persons to be measured of various heights.

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

[0012]

(1) In order to achieve the above object, the present invention has a cavity penetrating from an inlet opening to an outlet opening, and the cavity functions as a measurement chamber for accommodating a person to be measured. A main body, an openable / closable inlet door provided at the inlet opening, an openable / closable outlet door provided at the outlet opening, the main body, the inlet door and the outlet door provided in the measurement chamber. For the measurement subject placed in a standing position facing the exit door, including a plurality of radiation detectors for detecting radiation from the body surface, the measurement chamber, at least one of the upper portion and the lower portion It has a form in which the left-right width of is narrower than the left-right width of the intermediate portion.

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

Preferably, the lateral width of the upper portion of the measuring chamber is gradually narrowed upward. Also preferably,
The lateral width of the lower portion of the measurement chamber is gradually narrowed downward. Desirably, the cavity as the measurement chamber has a substantially rhombic shape as a whole. The rhombus shape is a rational form that allows the inner surfaces of the measurement chamber to be close to the human body surface while covering the outer shapes of human bodies of various sizes. Also,
The rhombus shape is softer than the simple rectangle, and since the shape itself is apt to give a sense of familiarity, an effect of reducing a feeling of pressure can be expected.

Preferably, the main body includes a right upper surface, a lower right surface, an upper left surface, a lower left surface, and a floor surface facing the measurement chamber, and the plurality of radiation detectors are provided for the upper right surface provided on the right upper surface. Radiation detector, lower right radiation detector provided on the lower right surface, upper left radiation detector provided on the upper left surface, lower left radiation detector provided on the left lower surface, and the floor Floor radiation detector provided on a surface, a back radiation detector provided on an inner surface of the entrance door facing the measurement chamber, and a front radiation detector provided on an inner surface of the exit door facing the measurement chamber And are included. The radiation detector may be composed of a plurality of sensor units, or the two radiation detectors may be composed of one sensor unit.

Desirably, there is provided an attitude changing means for changing the attitude 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 chamber according to the height of the person to be measured. Desirably, the radiation detector for the upper right and the radiation detector for the upper left perform tilting movements with the lower side thereof as a rotation axis. When the position of the head is lowered, it is desirable to change the posture of the upper radiation detector according to the height of the person to be measured in which the distance from the radiation detector to the head is reduced to improve the detection sensitivity.

Desirably, the main body communicates with the measurement chamber, and the right hand groove accommodated in the measurement chamber into which the right hand of the person to be measured is inserted from above and the measurement chamber are communicated with each other. A left-hand groove into which the left hand of the measured person is inserted from above is formed, and the plurality of radiation detectors includes right-hand radiation for detecting radiation from the right-hand inserted in the right-hand groove. A detector and a left-handed radiation detector for detecting radiation from the left-hand inserted in the left-hand groove are included.

According to the above construction, the radiation is measured by inserting the hands into the grooves provided on the right and left sides of the person without raising both hands forward from both shoulders. In a typical body shape, the angle of opening the upper arm varies depending on the height, and the length of the hand increases depending on the height. Therefore, even if the height of the two grooves is fixed, Can accommodate height.

(2) In order to achieve the above object, the present invention has a cavity that penetrates from an inlet opening to an outlet opening, the cavity functioning as a measurement chamber for accommodating a person to be measured; An openable / closable entrance door provided at the entrance opening, an openable / closable exit door provided at the exit opening, the main body, the entrance door and the exit door, and facing the exit door in the measurement chamber A plurality of radiation detectors for detecting the radiation from the body surface of the subject placed in a standing position, wherein at least one of the plurality of radiation detectors is It is characterized in that the degree of inclination toward the measuring chamber can be changed according to the height.

According to the above construction, the radiation detector can be changed in posture depending on its height and body shape to improve the detection sensitivity. The data such as height may be read from a card carried by the person to be measured, or the height sensor may be provided near the entrance opening or in the measurement room.

Preferably, the inner surface of the body is a right upper surface,
A lower right surface, an upper left surface, a lower left surface, and a floor surface, and the plurality of radiation detectors include an upper right radiation detector provided on the right upper surface and a lower right radiation detector provided on the right lower surface. An upper left radiation detector provided on the upper left surface, a lower left radiation detector provided on the lower left surface, and a floor radiation detector provided on the floor surface.

Preferably, at least one of the upper right radiation detector and the upper left radiation detector tilts with its lower side as a rotation axis. According to this configuration, when measuring a person with a high height, the radiation detectors for the upper right and / or the upper left are retracted or in the original position, and when measuring a person with a short height, the measurement room side The inclination to the angle becomes larger and the distance to the head becomes shorter.

(3) In order to achieve the above object,
The present invention has a cavity that penetrates from an inlet opening to an outlet opening, the cavity functioning as a measurement chamber for accommodating a person to be measured, an openable / closable inlet door provided at the inlet opening, and the outlet. An openable / closable outlet door provided in the opening, the body, the inlet door, and the outlet door, which are provided in the measurement chamber and are placed in an upright position facing the outlet door in the measurement chamber A plurality of radiation detectors for detecting radiation from the surface; and, in the main body, a groove for the right hand, which communicates with the measurement chamber and into which the right hand of the person to be measured housed in the measurement chamber is inserted from above. A left-handed groove that communicates with the measurement chamber and into which the left hand of the subject stored in the measurement chamber is inserted from above is formed, and the plurality of radiation detectors are inserted into the right-handed groove. Right to detect radiation from the right hand And use the radiation detector, 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 penetrating in the penetrating direction of the cavity. If the groove penetrates, it is possible to reduce anxiety and pressure when inserting. The through-groove is preferably covered by both doors at the time of measurement.

(4) In order to achieve the above object,
The present invention has a cavity that penetrates from an inlet opening to an outlet opening, the cavity functioning as a measurement chamber for accommodating a person to be measured, an openable / closable inlet door provided at the inlet opening, and the outlet. An openable / closable outlet door provided in the opening, the body, the inlet door, and the outlet door, which are provided in the measurement chamber and are placed in an upright position facing the outlet door in the measurement chamber A plurality of radiation detectors for detecting radiation from the surface; and, in the main body, a groove for the right hand, which communicates with the measurement chamber and into which the right hand of the person to be measured housed in the measurement chamber is inserted from above. A left-handed groove that communicates with the measurement chamber and into which the left hand of the measurement subject stored in the measurement chamber is inserted from above, and the plurality of radiation detectors include the right-handed groove and the measurement. It is installed on the right partition wall between the room and Right-sided double-sided radiation detector capable of detecting radiation on the surface, and left-sided double-sided radiation detection provided on the left partition wall between the left-hand groove and the measurement chamber to detect radiation on both sides. And a container are included.

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

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a preferred embodiment of the 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 in, for example, a nuclear power plant, and specifically,
This device is installed at the entrance and exit of the radiation controlled area and measures the body surface contamination of workers entering and exiting the area.

The body surface monitor is roughly composed of 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. Note that FIG.
In, the Y direction is the direction in which the worker advances, the X direction is the left-right direction with respect to the worker, and the Z direction is the height direction.

The measuring chamber 18 as a cavity is roughly divided into 3
It is divided into two 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 wide in the X direction, the upper portion 18H is gradually narrowed in the X direction toward the upper side, and the lower portion 18L is moved downward in the X direction.
The width in the direction is gradually narrowing. Therefore, the measurement room 18
Has a vertically long rhombus shape as a whole when viewed from the inlet side. This rhombus shape is a shape corresponding to the expected height and body shape of the operator, and is a shape in which a radiation detector described later can be brought as close to the body surface as possible.

In the measuring chamber 18, the intermediate portion 18M
A pair of hand detecting units 26 are provided at the left and right ends in the X direction. The hand detection unit 26 is provided in the measurement chamber 18
It has a groove 28 as a vertical groove or a V-shaped groove communicating with. The groove 28 is a groove that penetrates in the Y direction. The right hand or the left hand is inserted into the groove 28, and radiation measurement of the hand is performed in that state. A partition wall 30 is formed between the groove 28 and the intermediate portion 18M, and the radiation detector S10 facing the groove 28 is provided on the partition wall 30. In addition, the radiation detector S in the groove 28
A radiation detector S11 is provided on the inner surface opposite to 10. These radiation detectors S10 and S11 and each radiation detector described later are planar radiation detectors,
Specifically, it is composed of a scintillator plate and a plurality of photomultiplier tubes.

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

Therefore, as described above, the measurement chamber 18 as a whole has a vertically long rhombus shape. The measurement room 18 further has a ceiling surface and a floor surface, and the floor surface has a radiation detector S9 for measuring radioactive contamination of the foot.
Is provided. At the time of measurement, the worker stands upright on the floor surface and places his / her hands on the hand detection unit 26.
Radiation is measured while it is inserted inside.

Further explaining the radiation detector,
In this embodiment, the entrance door 12 is provided with three radiation detectors S1 to S3 from the upper side to the lower side. Further, two radiation detectors S4 and S5 are provided vertically on the two upper inner surfaces 22. Further, two radiation detectors S6 and S7 are provided on the two lower inner surfaces 24 side by side, respectively.

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 the body surface contamination can be measured over the entire body of the worker who is the measured person.

FIG. 2 shows a schematic cross section of the body surface monitor shown in FIG. 1 as seen from above. In the configuration shown in FIG. 2, 18A indicates the inlet opening,
B indicates the outlet opening. The above-mentioned entrance door 12 and exit door 14 are provided in each opening. In FIG. 2, the center of rotation of the entrance door 12 is set to the left side as viewed from the approach direction, but of course it may be the right side. Similarly, the center of rotation of the outlet door 14 is formed on the right side as viewed from the entrance, but of course it may be on the left side. Further, the entrance door 12 and the exit door 14 may be a double door type door that opens in the left-right direction from the central portion. In any case, the doors 12 and 14 substantially hide the two openings 18A and 18B in the measurement chamber 18, thereby reducing background noise and enabling accurate detection of body surface contamination. Note that, in FIG. 2, the doors 12 and 14 do not have a length that covers the entire hand detecting unit 26, but of course, a larger door is installed, and the entire hand detecting unit 26 has the door. May be covered by.

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

Next, the operation will be described. First, in a state where the outlet door 14 is closed, the worker enters the inside of the measurement chamber 18 from the inlet opening side and stands up on the floor surface. In that state, the operator faces the inner surface of the exit door 14. Further, in that state, both hands are inserted into the two hand part detection units 26. Prior to starting the measurement, the entrance door 12 is closed. Then, the radiation measurement is performed for a predetermined time from the time when the radiation is closed.

When the radiation measurement is completed, only the exit door 14 is opened, which allows the worker to exit forward. After that, the exit door 14 is closed and the entrance door 12 is opened, and the same steps as described above are repeated. Therefore, the worker as the person to be measured does not need to change the direction inside the measurement chamber 18, so that the measurement time per person can be shortened. Further, since the radiation detector is brought close to the body surface, especially in the upper and lower parts of the worker, the detection sensitivity can be enhanced. Further, the measurement chamber 18 shown in FIG. 1 has a rhombus shape, and the measurement chamber 18 is configured with a certain height, so that almost all workers are accommodated to perform radiation measurement. It is possible.

In the body surface monitor of the present embodiment, the hand detection units 26 are fixedly provided at the left and right ends of the measurement chamber 18. However, the length of the hand is almost proportional to the height, and even with such a fixed arrangement, no particular problem occurs. Moreover, in general, in the case of a tall person, 2
It is possible to insert two hands into the hand detection unit 26 without opening one upper arm so much. On the other hand, in the case of a short person, the two upper arms are opened to some extent and the two hands are detected. 26, the difference in arm length and the difference in height can be absorbed or adjusted by such things as the difference in the upper arm opening or the bending angle of the joint. Therefore, even if the hand detection unit 26 is fixedly arranged, radiation measurement can be reliably performed for both hands according to various heights. However, the hand part detection unit 26 may be movable in the vertical direction as needed.

FIG. 3 shows another embodiment of the body surface monitor. In FIG. 3, the measurement chamber as a whole has a rhombus shape, which is similar to the configuration shown in FIG. In the embodiment shown in FIG. 3, a double-sided detection type radiation detector S20 is provided in the partition wall 30. That is, the radiation detector S20 is provided with scintillator plates on both one surface and the other surface, and detects the light emission generated by the scintillator plates by one or more photomultiplier tubes. Partition wall 30 with two independent radiation detectors
However, according to the present embodiment, by using such a double-sided detection type radiation detector, the partition wall 30 becomes thicker than necessary or the arrangement itself becomes difficult. Each problem can be solved.

Further, in the embodiment shown in FIG. 3, the two radiation detectors S4 provided at the uppermost part are configured to be able to change the inclination degree. Therefore, a tilting mechanism 32 is provided as a posture varying mechanism. When the height of the worker as the measured person is short, the tilting mechanism 32
Is operated and the tilt angle of the radiation detector S4 is increased. Thereby, the main sensitivity direction can be adjusted to the head of the person to be measured as much as possible, so that the detection sensitivity can be enhanced. Of course, such an inclination angle is preferably set according to the height of the operator, or the radiation detector S4 may be inclined when the height is lower than a certain value. When the height of the worker is high, the radiation detector S4 is returned to the original angle, and the radiation measurement is performed in that state.

In the embodiment shown in FIG. 3, the postures of only the uppermost two radiation detectors S4 are adjusted, but of course the postures of the other radiation detectors can be changed according to the height or body type. You may do it. In any case, the detection efficiency can be improved 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 composed of the vertical surface and the inclined surface, but the rhombus shape is maintained as the whole measurement chamber. There is.

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

[0047]

As described above, according to the present invention,
The detection sensitivity can be improved. Further, according to the present invention, the feeling of psychological pressure can be reduced. Further, according to the present invention, various heights can be accommodated.

[Brief description of drawings]

FIG. 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.

FIG. 3 is a schematic diagram showing a configuration of a body surface monitor according to another embodiment.

[Explanation of symbols]

10 main body, 12 entrance door, 14 exit door, 18 measurement chamber (cavity part), 26 hand detection unit, 28 groove, S1
~ S11, S20 Radiation detector.

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 2G075 AA01 AA17 AA18 CA48 DA08                       FA18 FC14 GA21                 2G088 AA07 EE19 LL15

Claims (15)

[Claims] 1. A body having a cavity penetrating from an inlet opening to an outlet opening, the cavity functioning as a measurement chamber for accommodating a person to be measured, an openable / closable inlet door provided at the inlet opening, An openable and closable outlet door provided at the outlet opening, the main body, the inlet door and the outlet door provided, for the subject in the standing position facing the outlet door in the measurement chamber, A plurality of radiation detectors for detecting radiation from the body surface, wherein the measurement chamber has a shape in which the left and right width of at least one of the upper portion and the lower portion is narrower than the width of the intermediate portion A characteristic body surface monitor. 2. The body surface monitor according to claim 1, wherein the lateral width of the upper portion of the measurement chamber is gradually narrowed upward. 3. The body surface monitor according to claim 1, wherein the lateral width of the lower portion of the measurement chamber is gradually narrowed downward. 4. The body surface monitor according to claim 1, wherein the cavity as the measurement chamber has a substantially rhombic shape as a whole. 5. The body surface monitor according to claim 1, wherein the main body includes a right upper surface, a right lower surface, an upper left surface, a left lower surface, and a floor surface facing the measurement chamber, and the plurality of radiation detectors include: An upper right 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, and a lower left surface provided on the lower left surface. Lower left radiation detector, floor radiation detector provided on the floor, back radiation detector provided on the inner surface facing the measurement room of the entrance door, and inner surface facing the measurement room of the exit door A front surface radiation detector provided on the body surface monitor, and a body surface monitor. 6. The body surface monitor according to claim 5, further comprising posture changing means for changing the posture of at least one radiation detector according to the height of the person to be measured. monitor. 7. The body surface monitor according to claim 5, wherein at least one of the upper right radiation detector and the upper left radiation detector tilts into the measurement chamber according to the height of the person to be measured. A characteristic body surface monitor. 8. The body surface monitor according to claim 7, wherein the radiation detector for the upper right and the radiation detector for the upper left are tilted about their lower sides as rotation axes. 9. The body surface monitor according to claim 1, wherein the body has a right-hand groove that communicates with the measurement chamber and into which the right hand of the person to be measured housed in the measurement chamber is inserted from above. A left-hand groove that communicates with the measurement chamber and into which the left hand of the measurement subject is inserted from above is formed, and the plurality of radiation detectors include a right-hand groove inserted into the right-hand groove. A body surface monitor, comprising: a right-hand radiation detector that detects radiation from the left hand; and a left-hand radiation detector that detects radiation from the left hand inserted into the left-hand groove. 10. A main body having a cavity penetrating from an inlet opening to an outlet opening, the cavity functioning as a measurement chamber for accommodating a person to be measured; an openable and closable inlet door provided at the inlet opening; An openable and closable outlet door provided at the outlet opening, the main body, the inlet door and the outlet door provided, for the subject in the standing position facing the outlet door in the measurement chamber, A plurality of radiation detectors for detecting radiation from the body surface, wherein at least one of the plurality of radiation detectors changes the inclination to the measurement chamber side according to the height of the person to be measured. A body surface monitor characterized by being capable of performing. 11. The body surface monitor according to claim 10, wherein the inner surface of the main body includes a right upper surface, a right lower surface, an upper left surface, a left lower surface, and a floor surface, and the plurality of radiation detectors include the right upper surface. An upper right radiation detector provided on the lower right radiation detector, a lower right radiation detector provided on the lower right surface, an upper left radiation detector provided on the upper left surface, and a lower left radiation provided on the left lower surface. A body surface monitor, comprising: a detector; and a floor radiation detector provided on the floor. 12. The body surface monitor according to claim 11, wherein at least one of the upper right radiation detector and the upper left radiation detector tilts about a lower side thereof as a rotation axis. . 13. A main body having a cavity penetrating from an inlet opening to an outlet opening, the cavity functioning as a measurement chamber for accommodating a person to be measured; an openable / closable inlet door provided at the inlet opening; An openable and closable outlet door provided in the outlet opening, the main body, the inlet door and the outlet door provided in the measurement chamber, the subject in the standing position facing the outlet door, A plurality of radiation detectors for detecting radiation from the body surface; and, in the main body, a groove for the right hand, which communicates with the measurement chamber and into which the right hand of the person to be measured housed in the measurement chamber is inserted from above. And a left-handed groove that communicates with the measurement chamber and into which the left hand of the measurement subject stored in the measurement chamber is inserted from above, and the plurality of radiation detectors are inserted into the right-handed groove. Radiation from the right hand A right-hand radiation detector for detecting, body surface monitors, characterized in that the left-hand radiation detector for detecting radiation from the left hand inserted into the left groove includes. 14. The body surface monitor according to claim 13, wherein the groove for the right hand and the groove for the left hand are grooves penetrating in the penetrating direction of the cavity. 15. A main body having a cavity penetrating from an inlet opening to an outlet opening, the cavity functioning as a measurement chamber for accommodating a person to be measured; an openable and closable inlet door provided at the inlet opening; An openable and closable outlet door provided in the outlet opening, the main body, the inlet door and the outlet door provided in the measurement chamber, the subject in the standing position facing the outlet door, A plurality of radiation detectors for detecting radiation from the body surface; and, in the main body, a groove for the right hand, which communicates with the measurement chamber and 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 communicating with the measurement chamber and into which the left hand of the measurement subject accommodated in the measurement chamber is inserted from above, and the plurality of radiation detectors include the right-hand groove and the right-hand groove. Right partition wall between measurement chamber A double-sided radiation detector for the right side that is provided and can detect radiation on both sides, and a left-sided dual-sided radiation detector that is provided on the left partition wall between the left-hand groove and the measurement chamber and that can detect radiation on both sides Type radiation detector, and a body surface monitor, comprising: