Dose distribution measuring device

Patent metadata

Field	Value
Publication number	US-9645254-B2
Application number	US-201514838896-A
Country	US
Kind code	B2
Filing date	Aug 28, 2015
Priority date	Mar 12, 2013
Publication date	May 9, 2017
Grant date	May 9, 2017

Abstract

The present invention measures the dose distribution of radiation emitted from a measurement region. A dose distribution measuring device comprises a radiation detecting unit and a radiation varying unit disposed between the radiation detecting unit and a measurement region. A dose at the location of the radiation detecting unit is measured by the radiation detecting unit in a state in which the direction from which the radiation, which is to be measured by being varied by the radiation varying unit, is emitted from the measurement region onto the radiation detecting unit, is predetermined. The angular distribution of the radiation dose emitted on the radiation detecting unit from the measurement region is measured by identifying the direction and angle from which the radiation arrives from the measurement region to the radiation detecting unit and calculating the dose of the arriving radiation before varying with the radiation varying unit.

First claim

The invention claimed is:

1. A dose distribution measuring device comprising:
a radiation detecting unit and;
a radiation varying unit arranged between the radiation detecting unit and a region to be measured, the radiation varying unit varying the strength of radiation from the region to be measured,
wherein
a dose at a location of the radiation detecting unit is measured by the radiation detecting unit,
in a state in which a direction of a radiation, of which a dose is to be varied by the radiation varying unit and measured, is predetermined and,
a dose angular distribution of a radiation emitted from the region to be measured toward the radiation detecting unit is measured,
by way in which the direction or an angle, where the radiation arrives to the radiation detecting unit from the region to be measured, is identified and a dose of the radiation before being varied by the radiation varying unit is calculated as a difference from a dose measured by the radiation detecting unit in the case where the radiation varying unit is not arranged.

2. The dose distribution measuring device according to claim 1 , wherein the radiation varying unit comprises a second radiation varying unit and a moving means for two-dimensionally moving the second radiation varying unit, and
the moving means two-dimensionally moves the second radiation varying unit.

3. The dose distribution measuring device according to claim 2 , wherein an effective size and an effective shape of the second radiation varying unit are the same as or approximate to a size and a shape of a side surface of the radiation detecting unit, the side surface facing the second radiation varying unit.

4. The dose distribution measuring device according to claim 3 , further comprising a radiation shielding portion,
wherein the radiation detecting unit is covered by the radiation shielding portion except for a side surface of the radiation detecting unit, the side surface facing the second radiation varying unit.

5. The dose distribution measuring device according to claim 2 , further comprising a radiation shielding portion,
wherein the radiation detecting unit is covered by the radiation shielding portion except for a side surface of the radiation detecting unit, the side surface facing the second radiation varying unit.

6. The dose distribution measuring device according to claim 1 , wherein the radiation varying unit comprises a second radiation varying unit and a moving means for one-dimensionally moving the second radiation varying unit,
the radiation detecting unit comprises a radiation detecting one-dimensional array constituted by a plurality of radiation detectors linearly arranged, and
the moving means one-dimensionally moves the second radiation varying unit.

7. The dose distribution measuring device according to claim 6 , wherein an effective size and an effective shape of the second radiation varying unit are the same as or approximate to a size and a shape of a side surface of the radiation detector, the side surface facing the second radiation varying unit.

8. The dose distribution measuring device according to claim 7 , further comprising a radiation shielding portion,
wherein the radiation detector is covered by the radiation shielding portion except for a side surface of the radiation detector, the side surface facing the second radiation varying unit.

9. The dose distribution measuring device according to claim 6 , further comprising a radiation shielding portion,
wherein the radiation detector is covered by the radiation shielding portion except for a side surface of the radiation detector, the side surface facing the second radiation varying unit.

10. The dose distribution measuring device according to claim 1 , wherein the radiation varying unit comprises a second radiation varying unit and a fixing unit,
the radiation detecting unit comprises a radiation detecting two-dimensional array constituted by a plurality of radiation detectors planarly arranged, and
the fixing unit fixes the second radiation varying unit.

11. The dose distribution measuring device according to claim 10 , wherein an effective size and an effective shape of the second radiation varying unit are the same as or approximate to a size and a shape of a side surface of each radiation detector constituting the radiation detecting two-dimensional array, the side surface facing the second radiation varying unit.

12. The dose distribution measuring device according to claim 11 , further comprising a radiation shielding portion,
wherein the radiation detector is covered by the radiation shielding portion except for a side surface of the radiation detector, the side surface facing the second radiation varying unit.

13. The dose distribution measuring device according to claim 10 , further comprising a radiation shielding portion,
wherein the radiation detector is covered by the radiation shielding portion except for a side surface of the radiation detector, the side surface facing the second radiation varying unit.

14. The dose distribution measuring device according to claim 1 , wherein the radiation varying unit comprises a spatial modulating two-dimensional array constituted by a plurality of spatial modulators planarly arranged, and
the spatial modulating two-dimensional array changes a dose of radiation detected by the radiation detecting unit.

15. The dose distribution measuring device according to claim 14 , further comprising a radiation shielding portion,
wherein the radiation detecting unit is covered by the radiation shielding portion except for a side surface of the radiation detecting unit, the side surface facing the spatial modulating two-dimensional array.

16. The dose distribution measuring device according to claim 1 , wherein the radiation varying unit comprises a spatial modulating one-dimensional array constituted by a plurality of spatial modulators linearly arranged,
the radiation detecting unit comprises a radiation detecting one-dimensional array, and
the spatial modulating one-dimensional array changes a dose of radiation detected by the radiation detecting one-dimensional array.

17. The dose distribution measuring device according to claim 16 , further comprising a radiation shielding portion,
wherein each detector of the radiation detecting one-dimensional array is covered by the radiation shielding portion except for a side surface of each detector, the side surface facing the spatial modulating one-dimensional array.

18. The dose distribution measuring device according to claim 1 , further comprising one or both of a visible light camera and an infrared camera,
wherein one or both of a visible light image and an infrared image of the region to be measured are captured by one or both of the visible light camera and the infrared camera.

19. The dose distribution measuring device according to claim 1 , further comprising a distance meter,
wherein a distance between the radiation detecting unit and the region to be measured is measured by the distance meter, and a dose distribution of the region to be measured is obtained by calculating a dose of radiation emitted from each position on the region to be measured.

20. The dose distribution measuring device according to claim 19 , further comprising a display unit combining the dose distribution and one or both of the visible light image and the infrared image and displaying a composite image.

21. The dose distribution measuring device according to claim 2

Assignees

• Nat Inst Advanced Ind Science & Tech

Inventors

• Nagamune Yasushi

Classifications

• G01T7/00

  Details of radiation-measuring instruments · CPC title

• G01T1/16

  Measuring radiation intensity (G01T1/29 takes precedence {; self-powered detectors G01T3/006; using an ionisation chamber filled with a liquid or solid, e.g. frozen liquid, dielectric G01T3/008}) · CPC title

• G01T1/02

  Dosimeters (G01T1/15 takes precedence) · CPC title

• G01T1/167 Primary

  Measuring radioactive content of objects, e.g. contamination (whole body counters G01T1/163) · CPC title