JP4861240B2 - Body surface monitor - Google Patents

Description

  The present invention relates to a body surface monitor for measuring radiation contamination on a body surface of a subject used in a radiation handling facility.

In general, a conventional body surface monitor has radiation detectors for measuring radiation contamination on the front and back, side, head, and temporal regions of a subject fixedly installed on the monitor body, and these radiation detectors are installed. The radiation contamination of the body surface of the subject is measured by detecting the radiation emitted from the radioactive substance attached to the body surface of the subject. Patent Document 1 discloses a conventional example of a body surface monitor. In Patent Document 1, in addition to a front detector, a back detector, and an overhead detector that measure radiation contamination on the front surface, back surface, and top surface of the subject, respectively, radioactive contamination of the subject's temporal region is measured. A body surface monitor having a structure provided with a temporal detector has been proposed.
Japanese Patent No. 3100677

  However, the conventional technique of Patent Document 1 has the following problems.

  The subject's neck, throat, chin, etc. are concave with respect to the face, shoulders, and chest, that is, the neck, throat, chin, etc. When viewed from the front, it is present at a position that is further pulled back (back side) than the face and chest positions. For this reason, the distance between the neck portion, the throat portion, the chin portion and the like from the front detector is farther than the face and chest surface, and it is difficult to measure the radiation contamination of these portions with the front detector. Further, when viewed from the side of the subject (the temporal side), the neck portion, the throat portion, the chin portion, and the like are present at a position that is retracted deeper than the temporal portion. For this reason, the neck portion, the throat portion, the chin portion, and the like are farther away from the temporal detector than the temporal detector, and it is difficult to measure the radiation contamination of these portions with the temporal detector.

  In addition, radiation emitted from radioactive materials attached to the neck, throat, and jaw includes those whose radiation direction is not directed toward the radiation measurement surface of the front detector or the temporal detector. Therefore, radiation in such a direction is difficult to measure with a front detector or a temporal detector. For example, the radiation direction of the radiation emitted from the radioactive material attached to the lower jaw is downward from the lower jaw toward the ground, so there is no radiation on the radiation measurement surface of the front detector or the radiation measurement surface of the temporal detector. If it does not reach or if it arrives, it is very small and difficult to measure.

  As described above, the conventional body surface monitor has a problem that it is difficult to measure radiation contamination of the neck, throat, and jaw of the subject.

  The present invention proposes to solve the above-mentioned problems of the prior art, and an object thereof is to provide a body surface monitor that can reliably measure radiation contamination of the neck, throat, and jaw of a subject. It is in.

In order to solve the above problems, a body surface monitor according to the present invention includes a front frame, a front radiation detector installed on the front frame, a door installed on the front frame so as to be opened and closed, and a door. Side radiation detector installed, rear frame, rear radiation detector installed on the rear frame, head radiation detector, temporal radiation detector, and head radiation detection A body surface monitor that measures radiation contamination of a subject, and a head drive radiation detector. is disposed in a position closer to the front frame, the throat portion of the subject, which is movable in a measuring position close to at least one portion of the jaw portion, said throat portion, radiation fouling of at least one portion of the jaw portion And further comprising a radiation detector to measure.

  According to the present invention, it is possible to reliably measure radiation contamination in at least one of the neck portion, throat portion, and chin portion of a subject.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
First, the first embodiment of the body surface monitor of the present invention will be described with reference to FIGS.

  FIG. 1 is a general view when the body surface monitor 100 is viewed from the front. FIG. 2 is a diagram showing the inside of the measurement chamber of the body surface monitor 100. FIG. 2 shows a state when the body surface monitor 100 is viewed from the front through the front frame 1 shown in FIG. 3 and 4 are diagrams showing the drive mechanism unit 25 of the body surface monitor 100. FIG. FIG. 3 shows a state of the drive mechanism unit 25 (a state in which the drive mechanism unit 25 is in the initial position) when measurement of radiation contamination of the subject 200 is not performed. FIG. 4 shows a state of the drive mechanism unit 25 (a state in which the drive mechanism unit 25 is at the measurement position) when the radiation contamination of the subject 200 is being measured.

  The body surface monitor 100 of the present invention is a detector for measuring the radiation contamination of the subject 200, as shown in FIGS. 1 and 2, that is, the front-side radiation detector 2, the right-side radiation detector 3, Left side radiation detector 4, right hand radiation detector 5, left hand radiation detector 6, right foot radiation detector 7, left foot radiation detector 8, rear surface radiation detector 9, head radiation detector 11 In addition to the right-side temporal radiation detector 12 and the left-side temporal radiation detector 13, the apparatus further includes a neck radiation detector 16 shown in FIGS.

  The front radiation detector 2 is fixedly installed on the front frame 1 as shown in FIG. 1, and measures radiation contamination on the front surface of the subject 200. The radiation detector 3 for the right side surface is installed on one door 3a provided on the front frame 1 so as to be openable and closable, and measures radiation contamination on the right side surface of the subject 200 with the door 3a closed. The left-side radiation detector 4 is installed on the other door 4a provided on the front frame 1 so as to be openable and closable, and measures radiation contamination on the left side surface of the subject 200 with the door 4a closed. . The right-hand radiation detector 5 and the left-hand radiation detector 6 are fixedly installed on the front frame 1 and measure radiation contamination of the right hand and the left hand of the subject 200, respectively. The radiation detector 7 for the right foot and the radiation detector 8 for the left foot are fixedly installed on the pedestal of the body surface monitor 100 and measure radiation contamination of the right foot and the left foot of the subject 200, respectively.

  Further, as shown in FIG. 2, the rear radiation detector 9 is fixedly installed on the rear frame 10 and measures radiation contamination on the rear surface of the subject 200. The head radiation detector 11 is installed so as to be movable up and down (movable up and down) with respect to the rear frame 10 via an elevation drive mechanism (not shown), and is moved up and down according to the head position of the subject 200. And measure radiation contamination on the upper surface of the head. The right temporal radiation detector 12 and the left temporal radiation detector 13 are respectively installed on the left and right sides of the head radiation detector 11, and respectively measure the right and left temporal radiation contamination of the subject 200. To do.

  As shown in FIGS. 1 and 2, the main body of the body surface monitor 100 is constituted by the front frame 1, the rear frame 2, and the two doors 3a and 4a. Form a measurement chamber to measure contamination.

  Next, the drive mechanism unit 25 for moving the right temporal radiation detector 12, the left temporal radiation detector 13, and the neck radiation detector 16 will be described with reference to FIGS.

  The drive mechanism unit 25 has a head detector driving electric motor 14 for moving the right temporal radiation detector 12 and the left temporal radiation detector 13, and the driving force of the head detector driving electric motor 14 is geared. To the right temporal radiation detector 12 and the left temporal radiation detector 13, and the temporal detection for moving the right temporal radiation detector 12 and the left temporal radiation detector 13 in synchronization with each other. A fixed frame 17 that holds the neck radiation detector 16 movably toward the subject 200 with respect to the instrument connecting shaft 15 and the head radiation detector 11, and a driving force to the fixed frame 17 via a gear. And a neck detector driving motor 18 for moving the neck radiation detector 16.

  The right-side head radiation detector 12 and the left-side head radiation detector 13 are respectively installed at positions near the right and left heads of the subject 200 of the head radiation detector 11.

  The neck radiation detector 16 is installed on the portion of the head radiation detector 11 close to the face of the subject 200 (position close to the front frame 1 of the head radiation detector 11) via the fixed frame 17. Has been. Further, the neck radiation detector 16 has a radiation measurement surface on 16a and 16b which are surfaces facing the neck portion, the throat portion, and the chin portion of the subject 200. The fixed frame 17 has a shape that does not block radiation emitted from the face of the subject 200 toward the front radiation detector 2 so as not to hinder measurement of radiation contamination on the face of the subject 200.

  Next, the operation of the body surface monitor 100 when measuring radiation contamination will be described.

  When radiation contamination is not measured, the right side radiation detector 12, the left side radiation detector 13, and the neck radiation detector 16 are the temporal detector driving motor 14 and the neck detector driving motor 18. Are installed at the initial positions shown in FIG. The right temporal radiation detector 12 and the left temporal radiation detector 13 have a flat plate shape, and their initial positions are positions where the respective radiation measurement surfaces face the ground (with respect to the temporal region of the subject 200). The position where each radiation measurement surface is almost vertical). The initial position of the head radiation detector 11 is a position when the fixed frame 7 is substantially perpendicular to the ground.

  On the other hand, when measuring radiation contamination, the right side radiation detector 12, the left side radiation detector 13, and the neck radiation detector 16 are the temporal detector driving motor 14, the neck detector driving motor. 18 is moved to the measurement position (position shown in FIG. 4).

  Here, when the subject 200 enters the measurement room of the body surface monitor 100 and performs radiation contamination measurement, the head radiation detector 11 is lowered by a lifting drive mechanism (not shown) (direction A in FIG. 2). The subject 200 is moved to a position close to the head of the subject 200. In conjunction with the downward movement of the head radiation detector 11, the temporal detector drive motor 14 is connected to the right temporal radiation detector 12 and the left temporal head via the temporal detector coupling shaft 15. The radiation detector 13 is simultaneously moved in the C direction from the initial position and is positioned at the measurement position. Thus, the radiation measurement surfaces of the right temporal radiation detector 12 and the left temporal radiation detector 13 are respectively disposed at positions facing and close to the right temporal head and the left temporal head of the subject 200. Become. Simultaneously with the movement of the right-side and right-side radiation detectors 12 and 13, the neck detector driving motor 18 moves the neck radiation detector 16 from the initial position to the E direction via the fixed frame 17. Move to position at the measurement position. As a result, the radiation measurement surfaces 16a and 16b of the neck radiation detector 16 are arranged at positions facing and close to the neck portion, the throat portion, and the chin portion of the subject 200, respectively.

  When the measurement of the radiation contamination is finished, the lifting drive mechanism (not shown) moves the head radiation detector 11 upward (direction B in FIG. 2). In conjunction with the upward movement of the head radiation detector 11, the temporal detector drive motor 14 is connected to the right temporal radiation detector 12 and the left temporal head via the temporal detector coupling shaft 15. The radiation detector 13 is simultaneously moved from the measurement position in the D direction and returned to the initial position. At the same time, the neck detector driving motor 18 moves the neck radiation detector 16 from the measurement position in the direction F via the fixed frame 17 to return to the initial position.

  As described above, according to the first embodiment, the neck radiation detector 16 is brought close to the neck portion, the throat portion, and the chin portion of the subject 200 to measure the radiation contamination. Radiation contamination can be reliably measured, and more strict radiation contamination inspection and access control can be performed.

(Second Embodiment)
Next, a second embodiment of the body surface monitor of the present invention will be described with reference to FIGS. The body surface monitor 100 according to the second embodiment has a right neck radiation detector 19 shown in FIGS. 5 and 6 instead of the neck radiation detector 16 of the first embodiment shown in FIGS. The left neck radiation detector 20 is provided. The drive mechanism 26 of the body surface monitor 100 of the second embodiment includes the right neck radiation detector 19, the left neck radiation detector 20, the right neck radiation detector driving motor 21, and the left neck. A radiation detector driving motor 22, a right neck radiation detector connecting shaft 23, and a left neck radiation detector connecting shaft 24 are provided. Other configurations are the same as those of the body surface monitor 100 of the first embodiment described above, and the same components are denoted by the same reference numerals.

  FIG. 5 shows a state of the drive mechanism unit 26 (a state where each detector of the drive mechanism unit 26 is in an initial position) when the radiation contamination of the subject 200 is not measured. FIG. 6 shows a state of the drive mechanism unit 26 (a state in which each detector of the drive mechanism unit 26 is in the measurement position) when the radiation contamination of the subject 200 is being measured.

  The right neck radiation detector 19 has a radioactive measurement surface 19a for measuring the radiation radiated in the right direction of the subject 200 out of the radiation radiated from the neck portion, the throat portion, and the chin portion of the subject 200. . The left neck radiation detector 20 has a radioactive measurement surface 20a for measuring the radiation radiated in the left direction of the subject 200 out of the radiation radiated from the neck portion, the throat portion, and the chin portion of the subject 200. .

  The right neck radiation detector driving motor 21 is installed on the right head radiation detector 12 and is directly connected to the right neck radiation detector 19 via the right neck radiation detector connecting shaft 23. The neck radiation detector 19 is held rotatably with respect to the right temporal radiation detector 12. The left neck radiation detector driving motor 22 is installed on the left head radiation detector 13 and is directly connected to the left neck radiation detector 20 via the left neck radiation detector connecting shaft 24. The neck radiation detector 20 is held rotatably with respect to the left temporal radiation detector 13.

  As in the first embodiment, when measuring radiation contamination, the head radiation detector 11 is lowered by an elevating drive mechanism (not shown) and moved to a position close to the head of the subject 200. In conjunction with the downward movement of the head radiation detector 11, the temporal detector drive motor 14 is connected to the right temporal radiation detector 12 and the left temporal head via the temporal detector coupling shaft 15. The radiation detector 13 is simultaneously moved in the direction C from the initial position and is positioned at the measurement position. Simultaneously with the movement of the right side radiation detector 12 and the left side radiation detector 13, the right neck radiation detector driving motor 21 and the left neck radiation detector driving motor 22 are rotationally driven to drive the right neck. The right neck radiation detector 19 and the left neck radiation detector 20 are moved in the G direction from the initial position via the radiation detector coupling shaft 23 and the left neck radiation detector coupling 24, and are positioned at the measurement position. . Thereby, as shown in FIG. 5, the radiation measurement surfaces 19a and 20a of the right neck radiation detector 19 and the left neck radiation detector 20 are arranged on the left and right sides of the neck portion, the throat portion, and the chin portion of the subject 200, respectively. It will be arranged at a position facing and close to the side surface.

  When the measurement of the radiation contamination is finished, a lifting drive mechanism (not shown) moves the head radiation detector 11 upward. In conjunction with the upward movement of the head radiation detector 11, the temporal detector drive motor 14 is connected to the right temporal radiation detector 12 and the left temporal head via the temporal detector coupling shaft 15. The radiation detector 13 is moved in the D direction and returned from the measurement position to the initial position. At the same time, the right neck radiation detector driving motor 21 and the left neck radiation detector driving motor 22 are driven to rotate, the right neck radiation detector connecting shaft 23 and the left neck radiation detector connecting shaft 24. Then, the right neck radiation detector 19 and the left neck radiation detector 20 are moved in the H direction to return from the measurement position to the initial position.

  As described above, according to the second embodiment, the right neck radiation detector 19 and the left neck radiation detector 20 are brought close to the left and right side surfaces of the neck portion, the throat portion, and the jaw portion of the subject 200. Since the contamination is measured, it is possible to reliably measure the radiation contamination of these portions, and it is possible to perform a more strict inspection of radiation contamination and access control.

(Third embodiment)
Next, a third embodiment of the body surface monitor of the present invention will be described with reference to FIG. FIG. 7 is a perspective view of the front side (front side radiation detector 2 side) of the body surface monitor viewed from the measurement chamber of the body surface monitor 100.

  The body surface monitor 100 of the third embodiment includes a neck radiation detector 27 shown in FIG. 7 in place of the neck radiation detector 16 of the first embodiment shown in FIGS. . Furthermore, the drive mechanism part 28 and the base 29 are provided. Other configurations are the same as those of the body surface monitor 100 of the first embodiment described above, and the same components are denoted by the same reference numerals.

  The neck radiation detector 27 has radiation measurement surfaces 27a and 27b. The radiation measurement surface 27a is provided with a concave chin rest portion 27c at substantially the center so that the chin portion of the subject 200 can be placed thereon. The neck radiation detector 27 is held by a drive mechanism 28 so as to be movable in the vertical direction. The neck radiation detector 27 is held by the drive mechanism 28 at an initial position predetermined as an average jaw position of the subject 200 when measurement is not being performed. The drive mechanism 28 is fixedly installed on the front frame 1. Of the front radiation detectors 2 installed on the front frame 1, the front radiation detector 2 a for facial measurement places the face of the subject 200 on the chin rest portion 27 c of the neck radiation detector 27. In order to save space, it is installed at a position that is moved to the front frame 1 side relative to the other front radiation detectors 2b and 2c. Further, a radiation detector 7 for the right foot and a radiation detector 8 for the left foot are installed on the pedestal 29 on which the subject 200 is placed.

  A drive mechanism unit that moves the base 29 up and down in the vertical direction can be further provided. Further, as a driving control method by the driving mechanism unit 28 of the neck radiation detector 27 described above or a driving control method by a driving mechanism unit (not shown) of the pedestal 29, the jaw position (or head position, face position) of the subject 200 is used. Etc.), and the position of the movement destination of the neck radiation detector 27 or the base 29 is determined based on the jaw position (or head position, face position, etc.) detected by this sensor. It is also possible to move to a destination position.

  In the above description, the drive mechanism 28 is described as automatically moving the neck radiation detector 27 up and down in the vertical direction. However, the subject 200 manually moves the neck radiation detector 27 up and down. It is good also as a structure which can be moved up and down to a direction and can adjust the position.

  As described above, according to the third embodiment, the chin portion of the subject 200 is placed on the neck radiation detector 27, and the neck portion, the throat portion, and the chin portion are brought close to the neck radiation detector 27 to perform radiation. Since the contamination can be measured, the radiation contamination of these portions can be reliably measured, and it becomes possible to perform a more rigorous inspection of radiation contamination and access control.

  In addition, the neck radiation detector 27 or the pedestal 29 is moved up and down in the vertical direction so that the relative position of the subject 200 with respect to the neck, throat, and chin can be adjusted. The examiner 200 can perform measurement without taking an unreasonable posture.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment.

The general view when the body surface monitor of this invention is seen from the front. The figure which shows the mode inside the measurement chamber of a body surface monitor. The figure which showed the state in which each detector of the drive mechanism part of the body surface monitor which concerns on 1st Embodiment exists in an initial position. The figure which shows the state in which each detector of the drive mechanism part of the body surface monitor which concerns on 1st Embodiment exists in a measurement position. The figure which shows the state which each detector of the drive mechanism part of the body surface monitor which concerns on 2nd Embodiment exists in an initial position. The figure which shows the state in which each detector of the drive mechanism part of the body surface monitor which concerns on 2nd Embodiment exists in a measurement position. The perspective view which looked at the device front side from the inside of the measurement room of the body surface monitor concerning a 3rd embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Front frame, 2, 2a, 2b, 2c ... Radiation detector for front side, 3 ... Radiation detector for right side, 3a ... Door, 4 ... Radiation detector for left side, 4a ... Door, 5 ... Radiation for right hand Detector: 6 ... Radiation detector for left hand, 7 ... Radiation detector for right foot, 8 ... Radiation detector for left foot, 9 ... Radiation detector for rear surface, 10 ... Rear frame, 11 ... Radiation detector for head region, 12 ... Radiation detector for right temporal region, 13... Radiation detector for left temporal region, 14... Motor for driving head detector, 15... Shaft for connecting temporal detector, 16. Measurement surface, 17 ... fixed frame, 18 ... motor for driving detector for neck, 19 ... radiation detector for right neck, 19a ... radiation measurement surface, 20 ... radiation detector for left neck, 20a ... radiation measurement surface, 21 ... Electric motor for driving radiation detector for right neck, 22 ... Radiation detector driving motor for side neck, 23 ... Shaft for connecting radiation detector for right neck, 24 ... Shaft for connecting radiation detector for left neck, 25, 26 ... Drive mechanism, 27 ... Radiation detector for neck, 27a, 27b ... radiation measurement surface, 27c ... chin rest, 28 ... drive mechanism, 29 ... pedestal, 100 ... body surface monitor, 200 ... subject.

Claims (7)

A front frame, a front radiation detector installed on the front frame, a door installed on the front frame so as to be openable and closable, a side radiation detector installed on the door, a rear frame, and the rear surface Rear radiation detector installed on the frame, head radiation detector, temporal radiation detector, head radiation detector and temporal radiation detector can be moved up and down A body surface monitor for measuring radiation contamination of a subject, comprising an elevating drive mechanism installed on the rear frame,
Is located closer to the front frame of the head for a radiation detector, throat portion of said subject, which is movable in a measuring position close to at least one portion of the jaw portion, said throat portion, a chin portion A body surface monitor, further comprising a radiation detector for measuring radiation contamination in at least one place. In conjunction with the downward movement of the head radiation detector by the elevating drive mechanism, the radiation detector is moved from the initial position to at least one of the neck portion, throat portion, and chin portion of the subject. The body surface monitor according to claim 1, further comprising: a radiation detector driving electric motor that is moved to an adjacent measurement position. The temporal radiation detector is movably installed at a position close to the subject's temporal region of the head radiation detector,
The radiation detector is movably installed on the temporal radiation detector,
An electric motor for driving the temporal radiation detector that moves the temporal radiation detector from an initial position to a measurement position close to the temporal region of the subject;
In conjunction with the movement of the temporal radiation detector of the electric motor for driving the temporal radiation detector, the radiation detector is moved from an initial position to at least one of the neck portion, the throat portion, and the jaw portion of the subject. The body surface monitor according to claim 1, further comprising: a radiation detector driving motor that is moved to a measurement position close to the body. The said radiation detector is arrange | positioned in the position close | similar to the said subject's jaw of the said front frame, and has a chin mounting part for mounting the said subject's chin. Body surface monitor. The body surface monitor according to claim 4 , further comprising a drive mechanism that moves the radiation detector in a vertical direction according to a jaw position of the subject. The body surface monitor according to claim 5 , wherein the drive mechanism unit is capable of manually adjusting a position of the radiation detector. A sensor for detecting the jaw position of the subject;
The body surface monitor according to claim 5 , wherein the drive mechanism unit adjusts the position of the radiation detector based on a jaw position of the subject detected by the sensor.

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