JP2013160713A - Radiographic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radiographic apparatus capable of capturing an image of a subject onto an image forming material even with reduced distance between a neutron generation source and the image forming material.SOLUTION: A radiographic device includes; a neutron generator having a neutron generation source for generating neutrons; an image forming material placement unit which is located at a distance from the neutron generating source and allows an image forming material to be placed facing the neutron generating source; a housing which surrounds the neutron generating source and the image forming material placement unit; a thermal neutron conversion member which is configured to be permeable to neutrons and is capable of converting the neutrons to thermal neutrons; and a wraparound neutron blocking member which covers a side of image capturing material that is opposite the side facing the neutron generating source and is impermeable to the thermal neutrons. The thermal neutron conversion member is located on a path of the neutrons traveling from the neutron generating source to the image capturing material.

Description

  The present invention relates to a radiography apparatus for imaging a subject on an imaging material.

  Conventionally, a radiography apparatus for imaging a subject on an imaging material using neutrons has been provided.

  Such a radiography apparatus includes a neutron generation apparatus having a neutron generation source that generates neutrons, and an imaging material arrangement unit that is disposed at a distance from the neutron generation source, and images the neutron generation source so as to face the neutron generation source. An imaging material placement unit capable of placing material, and a collimator placed between the neutron generation source and the imaging material placement unit, and a straight line connecting the neutron generation source and the subject among the neutrons generated by the neutron generation source And a collimator for guiding only neutrons traveling in the same direction or substantially in the same direction to the imaging material. The collimator is formed in a cylindrical shape having a first end and a second end opposite to the first end. And the neutron absorption part which absorbs a neutron is provided in the internal peripheral surface of the collimator.

  In this type of radiography apparatus, when an object is imaged on the imaging material, the imaging material is arranged on the imaging material arrangement unit, and the object is arranged on the imaging material so as to face the neutron generation source. The neutron generated by the neutron generation source reaches the imaging material directly or after passing through the subject through the collimator.

  More specifically, in this type of radiography apparatus, when the neutron generation source generates neutrons, the neutrons enter the collimator. Among the neutrons that have entered the collimator, neutrons traveling in the same direction or substantially in the same direction as the collimator's center line extends (hereinafter referred to as the center line direction) (in the same direction as the straight line connecting the neutron source and the subject or Neutrons traveling in substantially the same direction pass through the collimator without contacting the neutron absorber (without being absorbed by the neutron absorber) inside the collimator.

  In this way, in the radiography apparatus having the above configuration, only neutrons traveling in the same direction as the center line direction or substantially in the same direction reach the imaging material. Then, a reaction occurs in a portion of the imaging material that has received neutrons, and a subject is imaged on the imaging material (see, for example, Patent Document 1).

JP 2010-230328 A

  By the way, neutrons generated by a neutron generation source travel in various directions. Therefore, in the radiography apparatus having the above configuration, the length of the collimator in the center line direction is set to be long so that only neutrons traveling in the same direction as the center line direction or substantially in the same direction reach the imaging material.

  That is, the collimator in the radiographic apparatus having the above configuration is symmetrical with respect to the collimator center line between the first end of the collimator and the second end of the collimator by setting the length in the center line direction to be long. The angle formed by a straight line (hereinafter referred to as a diagonal line) that connects the two parts and the center line of the collimator is reduced. In this way, in the conventional radiography apparatus, among the neutrons that have entered the collimator, the neutrons traveling in the direction intersecting the center line direction (neutrons whose traveling direction forms a large angle with respect to the center line of the collimator) ) Is absorbed by the neutron absorber, and only the neutrons traveling in the same direction as the center line direction and the direction approximate to the center line direction are allowed to reach the imaging material.

  However, in the radiography apparatus having the above configuration, since the neutrons that have contacted the neutron absorption part of the collimator are absorbed by the neutron absorption part, the total amount of neutrons generated by the neutron generation source does not reach the imaging material.

  For this reason, in the radiography apparatus having the above-described configuration, the amount of neutrons that reach the imaging material decreases with respect to the amount of neutrons generated by the neutron generation source. The neutron source is used.

  By the way, in the radiography apparatus having the above-described configuration, in order to make the neutron generation source smaller and to make the amount of neutrons generated by the neutron generation source reach the imaging material, the length of the collimator in the center line direction is set short. It is possible to do.

  However, in the radiography apparatus configured as described above, the shorter the length of the collimator in the center line direction, the greater the angle formed by the diagonal line with respect to the collimator center line, and the neutrons generated by the neutron generation source are larger than the imaging material. Proceed to the outside. Such neutrons may wrap around the imaging material and reach the opposite side of the imaging material facing the neutron generation source. When neutrons reach a portion of the imaging material corresponding to the portion where the subject is imaged, the portion where the subject is imaged reacts more than necessary, and the subject may not be accurately imaged on the imaging material.

  Therefore, in view of such a situation, an object of the present invention is to provide a radiography apparatus that can image a subject on an imaging material even if the interval between the neutron generation source and the imaging material is narrowed.

  A radiography apparatus according to the present invention is a neutron generation apparatus having a neutron generation source for generating neutrons, and an imaging material arrangement unit disposed at a distance from the neutron generation source, and facing the neutron generation source In a radiography apparatus comprising an imaging material arrangement unit capable of arranging an imaging material as described above, a housing surrounding the neutron generation source and the imaging material arrangement unit, and a thermal neutron conversion member configured to transmit the neutrons A thermal neutron conversion member capable of converting the neutrons into thermal neutrons, and a wraparound prevention member that covers the opposite side of the imaging material facing the neutron generation source, the thermal neutrons being impermeable. The thermal neutron conversion member is disposed on a neutron moving path from the neutron generation source toward the imaging material.

  According to the radiography apparatus having the above configuration, since the thermal neutron conversion member is disposed on the neutron moving path from the neutron generation source to the imaging material, the neutron generated by the neutron generation source is on the way to the imaging material. It passes through the thermal neutron conversion member. Accordingly, neutrons are converted into thermal neutrons by the thermal neutron conversion member.

  When the thermal neutrons converted from neutrons travel toward the imaging material, they reach the imaging material directly or after passing through the subject. Moreover, the thermal neutron converted from the neutron may go to the opposite side of the part facing the neutron generation source in the imaging material. However, in the radiography apparatus having the above-described configuration, since the wraparound prevention member covers the opposite side of the portion facing the neutron generation source in the imaging material, the wrapping prevention member faces the neutron generation source in the imaging material. Blocks thermal neutrons going to the other side of the part. Thereby, in the radiography apparatus having the above-described configuration, it is possible to prevent the portion of the imaging material where the subject is imaged from reacting more than necessary and preventing the subject from being normally imaged on the imaging material.

  As described above, the radiography apparatus having the above configuration blocks thermal neutrons even if thermal neutrons wrap around the opposite side of the portion of the imaging material facing the neutron generation source. Therefore, the radiography apparatus having the above-described configuration can capture an image of a subject on the imaging material even when the interval between the neutron generation source and the imaging material is reduced.

  In this case, the casing includes an inner casing main body that surrounds the neutron generation source, and an outer casing main body that is provided outside the inner casing main body. The at least part of the thermal neutrons may be configured to be reflected, and the outer casing main body may be configured to be able to shield electromagnetic waves.

  If it does in this way, at least one part of the thermal neutron which goes toward a different part from an imaging material can be reflected by the inside of a housing | casing. Therefore, the radiographic apparatus having the above configuration can cause more thermal neutrons to reach the imaging material. Therefore, in the radiography apparatus having the above configuration, the subject can be imaged more reliably on the imaging material.

  Further, according to the radiography apparatus having the above-described configuration, an electromagnetic wave may be emitted when the neutron generation source generates neutrons. However, in the radiography apparatus having the above configuration, since the outer casing main body is configured to shield electromagnetic waves, even when electromagnetic waves are generated from a neutron generation source, the electromagnetic waves are radiated to the outside of the casing. Can be prevented.

  In this case, the thermal neutron conversion member may include a first thermal neutron conversion member surrounding the neutron generation source. In this way, all neutrons generated by the neutron generation source pass through the first thermal neutron conversion member. Therefore, in the radiography apparatus having the above configuration, more neutrons can be converted into thermal neutrons. Therefore, in the radiography apparatus having the above configuration, more thermal neutrons can reach the imaging material, so that the subject can be more reliably imaged on the imaging material.

  In this case, the thermal neutron conversion member may include a second thermal neutron conversion member disposed between the imaging material and the neutron generation source. If it does in this way, even if the neutron generated with the neutron generation source permeate | transmits the 1st thermal neutron conversion member without being converted into a thermal neutron, this neutron can be converted into a thermal neutron by the 2nd thermal neutron conversion member. Therefore, in the radiography apparatus having the above configuration, more neutrons can be converted into thermal neutrons. Therefore, in the radiography apparatus having the above configuration, more thermal neutrons can reach the imaging material, so that the subject can be more reliably imaged on the imaging material.

  As one aspect of the radiography apparatus according to the present invention, the neutron generation apparatus includes a gas supply apparatus that supplies a hydrogen isotope gas and a voltage application apparatus that applies a negative voltage, and the neutron generation source is provided therein. A storage container having a space, the storage container having a grounded first electrode, and a second electrode disposed in the storage container, wherein the gas supply device includes a hydrogen isotope in the storage container. Gas may be supplied, and the voltage application device may apply a negative voltage to the second electrode.

  According to the radiography apparatus having the above configuration, when the voltage application device applies a negative voltage to the second electrode in a state where the hydrogen isotope gas is sealed in the storage container, a nuclear fusion reaction occurs in the storage container and neutrons are generated. Occurs. Therefore, according to the radiography apparatus having the above-described configuration, the subject can be imaged on the imaging material by the thermal neutrons converted from the neutrons generated inside the container.

  As described above, the radiography apparatus according to the present invention can achieve an excellent effect that the subject can be imaged on the imaging material even if the distance between the neutron generation source and the imaging material is reduced.

FIG. 1 is a schematic configuration diagram of a radiography apparatus according to an embodiment of the present invention. FIG. 2 is a schematic configuration diagram of a radiography apparatus according to an embodiment of the present invention, and shows a schematic configuration diagram of a state in which a subject is imaged on an imaging material. Note that the neutrons and thermal neutrons in FIG. 2 are conceptually illustrated.

  Hereinafter, a radiography apparatus according to an embodiment of the present invention will be described with reference to FIG.

  The radiography apparatus 1 according to the present embodiment includes a neutron generation apparatus 2 having a neutron generation source 20 that generates neutrons, and an imaging material arrangement unit 3 that is arranged at an interval from the neutron generation source 20. The imaging material placement unit 3 capable of placing the imaging material F so as to face the neutron generation source 20, the casing 4 surrounding the neutron generation source 20 and the imaging material placement unit 3, and the neutron can be transmitted. A thermal neutron conversion member 5 that can convert the neutrons into thermal neutrons, and a wraparound prevention member 6 that covers the opposite side of the imaging material F that faces the neutron source 20. And it is provided with the unwinding prevention member 6 which cannot permeate | transmit the said thermal neutron.

  Furthermore, the radiography apparatus 1 according to the present embodiment includes a shielding member 7 that can accommodate therein an imaging plate that reacts strongly with thermal neutrons as the imaging material F, and that can shield electromagnetic waves. Yes.

  The neutron generator 2 includes a gas supply device 21 that supplies a hydrogen isotope gas and a voltage application device 22 that applies a negative voltage. Furthermore, the neutron generator 2 according to the present embodiment includes an evacuation device 23 that performs decompression.

  The neutron generation source 20 of the neutron generator 2 is a storage container 20a having a space inside, and is disposed in the storage container 20a having a grounded first electrode (not numbered) and the storage container 20a. Second electrode 20b.

  In the present embodiment, the storage container 20a has a space inside. In the present embodiment, the outer shape of the container 20a is spherical. The container 20a according to the present embodiment is entirely made of a metal material. Accordingly, the storage container 20a according to the present embodiment is also used as the first electrode.

  The second electrode 20b is composed of a plurality of annular members (not shown). The diameters of the annular members are set to be substantially the same. And each of a some annular member is arrange | positioned so that a mutual centerline may extend in a different direction, and it arrange | positions so that each centerline may cross | intersect at one point. Thereby, the space inside the second electrode 20b is always open to the outside of the second electrode 20b.

  The gas supply device 21 supplies a hydrogen isotope gas into the storage container 20a. More specifically, the gas supply device 21 is connected to the container 20a via a tubular gas supply path 210. The interior of the gas supply path 210 is configured to communicate with the space inside the storage container 20a. As a result, the gas supply device 21 can supply the hydrogen isotope gas into the storage container 20a via the gas supply path 210. In the present embodiment, the gas supply device 21 supplies deuterium into the storage container 20a.

  The voltage application device 22 applies a negative voltage to the second electrode 21b. More specifically, the voltage application device 22 is connected to the second electrode 20b of the neutron generation source 20 via a conductive wire (in this embodiment, a high-voltage cable) 220. Thereby, the voltage application apparatus 22 can apply a negative voltage with respect to the 2nd electrode 20b.

  The vacuum exhaust device 23 performs pressure reduction in the container 20a. More specifically, the vacuum evacuation device 23 is fluidly connected to the storage container 20 a via the pipe line 230. That is, the inside of the conduit 230 is configured to communicate with the space inside the storage container 20a. Thereby, in the neutron generator 2 which concerns on this embodiment, the space inside the storage container 20a can be pressure-reduced via the pipe line 230 by the vacuum exhaust apparatus 23 now. In addition, as the vacuum exhaust device 23, a rotary pump, a turbo molecular pump, etc. are employable.

  The imaging material placement unit 3 is placed along the inner surface of the housing 4. The imaging material placement unit 3 according to the present embodiment is formed in a plate shape.

  The housing 4 is a housing body 40 that surrounds the neutron generation source 20, and includes a housing body 40 provided with a through hole 402 and a lid 41 that can close the through hole 402 of the housing body 40. With.

  The housing body 40 according to the present embodiment is configured so that the outer shape is a rectangular parallelepiped shape by a plurality of partition walls (not numbered). Each of the housing main body portions 40 has a two-layer structure. That is, the housing main body 40 according to the present embodiment includes an inner housing main body 400 whose outer shape is a rectangular parallelepiped, and an outer housing main body 401 provided outside the inner housing main body 400. .

  The inner housing body 400 is configured to be able to reflect at least part of the collided thermal neutrons. In the present embodiment, the inner housing body 400 is made of graphite. Thereby, the inner housing body 400 according to the present embodiment can suppress thermal neutrons from being transmitted to the outside of the housing 4. Furthermore, the inner housing body 400 according to the present embodiment is formed in a box shape.

  The outer casing body 401 is configured to shield electromagnetic waves. In the present embodiment, the outer casing main body 401 is made of lead. Thereby, the outer housing body 401 according to the present embodiment can suppress the transmission of electromagnetic waves to the outside of the housing 4. In addition, the outer casing body 401 according to the present embodiment is provided in a portion constituting the outer surface of the casing 4 in the inner casing body 400.

  The housing body 40 of the housing 4 according to this embodiment is provided with a through hole 402 on one surface of the housing body 40 facing the neutron generation source 20. The through hole 402 is a first hole 402 a provided inward from the outer surface of the housing main body 40, and a second hole provided continuously to the first hole 402 a and connected to the inside of the housing main body 40. It is formed with the hole 402b. The hole diameter in the axial direction of the first hole 402a is constant. The hole diameter in the axial direction of the second hole portion 402b is configured to increase toward the inside of the housing main body portion 40.

  The inner lid portion 410 is configured to be able to reflect at least a part of the collided thermal neutrons. In the present embodiment, the inner lid portion 410 is made of graphite. Thereby, the inner side cover part 410 which concerns on this embodiment can suppress that a thermal neutron permeate | transmits the exterior of the housing | casing 4. FIG. And the inner side cover part 410 which concerns on this embodiment is comprised with respect to the housing body part 40 so that attachment or detachment is possible.

  The outer lid portion 411 is configured to shield electromagnetic waves. In the present embodiment, the outer lid portion 411 is made of lead. Thereby, the outer side cover part 411 which concerns on this embodiment can suppress that electromagnetic waves permeate | transmit the exterior of the housing | casing 4. FIG. Further, the outer lid portion 411 according to the present embodiment is provided in a portion constituting the outer surface of the housing 4 in the inner lid portion 410.

  The thermal neutron conversion member 5 is disposed on a neutron moving path from the neutron generation source 20 toward the imaging material F. More specifically, the thermal neutron conversion member 5 is a first thermal neutron conversion member 50 that surrounds the neutron generation source 20, and a second heat disposed between the storage container 20 a of the neutron generation source 20 and the imaging material F. A neutron conversion member 51.

  The first thermal neutron conversion member 50 is arranged so as to surround the container 20a of the neutron generation source 20. In the present embodiment, water is used as the first thermal neutron conversion member 50. Accordingly, the radiography apparatus 1 according to the present embodiment includes an outer shell member 500 that surrounds the storage container 20a. Thereby, a space is formed between the container 20 a of the neutron generation source 20 and the outer shell member 500. The first thermal neutron conversion member 50 is filled in a space between the storage container 20 a of the neutron generation source 20 and the outer shell member 500. In the present embodiment, the outer shape of the outer shell member 500 is spherical.

  The second thermal neutron conversion member 51 according to the present embodiment is disposed in the first hole 402 a of the housing 4. The second thermal neutron conversion member 51 according to the present embodiment is made of polyethylene.

  The anti-rotation member 6 according to the present embodiment is provided inside the housing 4 including a portion that defines the through hole 402 of the housing body 40. If demonstrating it concretely, the 1st anti-rotation member 60 provided in the part corresponding to the through-hole 402 (1st hole 402a) of the housing body part 40 in the inner side cover part 410, and the anti-rotation member 6 will be described. And a second anti-rotation member 61 provided in a portion including a portion defining the through hole 402 (first hole portion 402a and second hole portion 402b) inside the inner housing main body 400. The first entrainment 60 and the second entrainment prevention member 61 according to the present embodiment are made of cadmium.

  The shielding member 7 is formed in a box shape whose one surface can be opened. The shielding member 7 according to the present embodiment includes a box-shaped first shielding member 70 whose one surface is opened, and a second shielding member 71 that can close the opened portion of the first shielding member 70. .

  The first shielding member 70 is made of lead. The first shielding member 70 is disposed in the first hole 402 a of the housing 4 so that one surface is open toward the outside of the housing 4.

  The second shielding member 71 is made of lead. The second shielding member 71 according to the present embodiment is provided on the first turn-in preventing member 60 of the turn-in preventing member 6. That is, the second shielding member 71 according to the present embodiment is provided on the inner lid portion 410 via the first turning-in preventing member 60 of the turning-in preventing member 6. Thereby, when the cover part 41 of the housing | casing 4 is attached to the housing main-body part 40 of the housing | casing 4, the 2nd shielding member 71 open | released the 1st shielding member 70 according to this embodiment. The surface is blocked.

  The second shielding member 71 according to the present embodiment can fix the imaging material F and the subject T. That is, in the present embodiment, one surface of the second shielding member 71 (one surface constituting the inner surface of the shielding member 7) constitutes the imaging material arrangement unit 3. Accordingly, the imaging material F fixed to one surface (imaging material placement unit 3) of the second shielding member 71 is covered by the anti-rotation member 6 on the opposite side of the part facing the neutron generation source 20 in the imaging material F. (In this embodiment, it is covered via the second shielding member 71).

  The radiography apparatus 1 according to the present embodiment is as described above. Next, an operation of imaging the subject T on the imaging material F using the radiography apparatus 1 will be described with reference to FIG.

  In the radiography apparatus 1 according to the present embodiment, when the subject T is imaged on the imaging material F, the lid portion 41 of the housing 4 is removed from the housing body 40 of the housing 4. Then, the imaging material F and the subject T are fixed to the imaging material arrangement unit 3 (on the second shielding member 71 provided on the inner lid 410). In this state, the lid 41 of the housing 4 is attached to the housing body 40 of the housing 4, so that the imaging material placement unit 3 to which the imaging material F and the subject T are fixed is inside the housing 4. It is arranged along.

  Then, the inside of the storage container 20 a is decompressed by the vacuum exhaust device 23. Further, hydrogen isotope gas (in this embodiment, deuterium) is supplied from the gas supply device 21 into the inside of the container 20a. When the voltage application device 22 applies a negative voltage to the second electrode 20b in such a state, a discharge occurs between the container (first electrode) 20 and the second electrode 20b. Accordingly, deuterium ions directed toward the second electrode 20b are generated inside the storage container 20a. As described above, since the inside of the second electrode 20b is open to the outside, deuterium ions move toward the center of the second electrode 20b. And the deuterium ion which progresses toward the center part of the 2nd electrode 20b collides with deuterium, and a nuclear fusion reaction arises, The neutron N1 is generate | occur | produced from the inside of the storage container 20a.

  Neutrons N1 generated from the inside of the container 20a are decelerated when passing through the first thermal neutron conversion member 50. And the neutron N1 fully decelerated by the 1st thermal neutron conversion member 50 turns into a thermal neutron N2.

  The thermal neutron N2 converted by the first thermal neutron conversion member 50 reaches the imaging material F directly or after passing through the subject T. In addition, at least a part of the thermal neutrons N2 traveling toward a part different from the imaging material F is reflected by the inside of the casing 4 (inner casing main body 400). And the thermal neutron N2 which permeate | transmits the inside of the inner housing | casing main-body part 400, without being reflected by the inner housing | casing main-body part 400, and goes to the opposite side of the part facing the neutron generation source 20 in the imaging material F is a wraparound prevention member. 6 (first turn-in preventing member 60 and second turn-in preventing member 61).

  Furthermore, among the neutrons N1 generated in the storage container 20a of the neutron generation source 20, the neutrons N1 that have not been sufficiently decelerated by the first thermal neutron conversion member 50 are converted into the thermal neutrons N2 without being converted into the thermal neutrons N2. Radiated inside. When the neutron N1 radiated into the housing 4 passes through the second thermal neutron conversion member 51, it is decelerated by the second thermal neutron conversion member 51. Therefore, when the neutron N1 radiated into the housing 4 is sufficiently decelerated by the second thermal neutron conversion member 51, it becomes thermal neutron N2. The thermal neutron N2 converted from the neutron N1 by the second thermal neutron conversion member 51 also reaches the imaging material F directly or after passing through the subject T.

  As described above, in the radiography apparatus 1 according to the present embodiment, the portion of the imaging material F where the thermal neutron N2 has reached the reaction causes the subject T to be imaged on the imaging material F. Therefore, the radiography apparatus 1 according to the present embodiment can achieve an excellent effect that the subject T can be imaged on the imaging material F even if the distance between the neutron generation source 20 and the imaging material F is narrowed.

  Further, in the radiography apparatus 1 according to the present embodiment, the wraparound prevention member 6 covers the opposite side of the portion of the imaging material F that faces the neutron generation source 20. Therefore, the wraparound prevention member 6 blocks thermal neutrons N2 that are directed to the opposite side of the portion of the imaging material F that faces the neutron generation source 20. Thereby, in the radiography apparatus 1 according to the present embodiment, the portion of the imaging material F where the subject T is imaged is caused to react excessively, thereby preventing the subject T from being normally imaged on the imaging material F. You can also

  Note that the radiography apparatus of the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the gist of the present invention.

  In the above embodiment, the imaging plate is used as the imaging material F. However, the imaging plate is not limited to this. For example, as long as it reacts strongly with the thermal neutron N2, a material other than the imaging plate is used as the imaging material F. It can also be used.

  Moreover, in the said embodiment, although the external shape of the housing | casing 4 was a rectangular parallelepiped shape, it is not limited to this, For example, the external shape of the housing | casing 4 may be spherical.

  Moreover, in the said embodiment, the 2nd electrode 20b is arrange | positioned so that each center line may be arrange | positioned so that a center line may extend in a different direction, and each center line may cross | intersect at one point. Although it was comprised, it is not limited to this, For example, it can also be set as shapes, such as a hollow cylinder and a hollow polyhedron.

  In the above embodiment, the gas supply device 21 supplies deuterium to the inside of the storage container 20a. However, the present invention is not limited to this. For example, a gas mixture of deuterium and tritium is stored. You may make it supply in the inside of the container 20a.

  Moreover, in the said embodiment, although the inner housing | casing main-body part 400 and the inner side cover part 410 were comprised with graphite, it is not limited to this, For example, the inner side case main-body part 400 and the inner side cover part 410 are included. Is made of polyethylene, concrete, paraffin, water, heavy water, or the like, so that at least a part of the collided thermal neutrons N2 can be reflected.

  Moreover, in the said embodiment, although the outer housing | casing main-body part 401 and the outer side cover part 411 were comprised with lead, it is not limited to this, For example, the outer side housing | casing main body part 401 and the outer side cover part 411 are comprised. Can also be comprised of what can block electromagnetic waves, such as SUS, iron, lead, cadmium.

  In the above embodiment, in order to prevent electromagnetic waves from being transmitted from the inside of the housing 4 to the outside of the housing 4, the housing body 40 includes the outer housing body 401 and the lid 41 is outside. Although the lid portion 411 is provided, the present invention is not limited to this. For example, the housing main body portion 40 can be configured by only the inner housing main body portion 400. However, it goes without saying that the effect of preventing electromagnetic waves is improved by providing the housing body 40 with the outer housing body 401.

  Moreover, in the said embodiment, although the thermal neutron conversion member 5 was provided with the 1st thermal neutron conversion member 50 and the 2nd thermal neutron conversion member 51, it is not limited to this, For example, a thermal neutron conversion The member 5 can also be composed of only the first thermal neutron conversion member 50 or only the second thermal neutron conversion member 51.

  Moreover, in the said embodiment, although the water was used for the 1st thermal neutron conversion member 50, it is not limited to this, For example, heavy water is stored as the 1st thermal neutron conversion member 50 with the storage container 20a. You may accommodate between the shell members 500. FIG.

  Moreover, in the said embodiment, although it did not mention in particular, the outer shell member 500 may be comprised with the material which can convert the neutrons N1, such as polyethylene, into the thermal neutrons N2. In this way, more neutrons N1 can be converted into thermal neutrons N2.

  Moreover, in the said embodiment, although the 2nd thermal neutron conversion member 51 was comprised by polyethylene, it is not limited to this, For example, the 2nd thermal neutron conversion member 51 is neutrons, such as water and concrete N1 may be decelerated and converted to thermal neutron N2.

Moreover, in the said embodiment, although the 1st anti-rotation member 60 and the 2nd anti-rotation member 61 were comprised with cadmium, it is not limited to this, For example, the 1st anti-rotation member 60 and a second time write-preventing member 61 may be gadolinium, _LiF, B 4 C, also be configured with one capable of absorbing thermal neutrons N2 such as BN.

  DESCRIPTION OF SYMBOLS 1 ... Radiography apparatus, 2 ... Neutron generation source, 3 ... Imaging material arrangement | positioning part, 4 ... Housing | casing, 5 ... Thermal neutron conversion member, 6 ... Unwinding prevention member, 7 ... Shielding member, 20 ... Containment container, 21 ... 2nd electrode, 22 ... gas supply device, 23 ... voltage application device, 24 ... vacuum exhaust device, 40 ... housing body, 41 ... lid, 50 ... first thermal neutron conversion member, 51 ... second thermal neutron conversion 60, first entrainment prevention member, 61 ... second entrainment prevention member, 70 ... first shielding member, 71 ... second shielding member, 220 ... gas supply path, 240 ... conduit, 400 ... inner casing Main body part 401 ... Outer housing main body part 402 ... Through hole 402a ... First hole part 402b ... Second hole part 410 ... Inner cover part 411 ... Outer cover part 500 ... Outer shell member, F ... Imaging material, N1 ... neutron, N2 ... thermal neutron, T ... subject

Claims (5)

  A neutron generating apparatus having a neutron generating source for generating neutrons, and an imaging material arranging unit arranged at a distance from the neutron generating source, wherein the imaging material can be arranged to face the neutron generating source In a radiography apparatus comprising a material arrangement unit, a housing surrounding the neutron generation source and the imaging material arrangement unit, and a thermal neutron conversion member configured to be able to transmit the neutron, the neutron being converted into a thermal neutron A convertible thermal neutron conversion member, and a wraparound prevention member that covers the opposite side of the portion facing the neutron generation source in the imaging material, comprising a wraparound prevention member that cannot transmit the thermal neutrons, The thermal neutron conversion member is a radiography apparatus arranged on a neutron moving path from the neutron generation source toward the imaging material.   The casing includes an inner casing body that surrounds the neutron generation source, and an outer casing body that is provided outside the inner casing body. The radiography apparatus according to claim 1, wherein the radiography apparatus is configured to reflect at least a part of neutrons, and the outer casing body is configured to shield electromagnetic waves.   The radiography apparatus according to claim 1, wherein the thermal neutron conversion member includes a first thermal neutron conversion member that surrounds the neutron generation source.   The radiography apparatus according to any one of claims 1 to 3, wherein the thermal neutron conversion member includes a second thermal neutron conversion member disposed between the imaging material and the neutron generation source.   The neutron generator includes a gas supply device that supplies a hydrogen isotope gas and a voltage application device that applies a negative voltage, and the neutron generation source is a container having a space inside and is grounded A storage container having a first electrode; and a second electrode disposed in the storage container, wherein the gas supply device supplies a hydrogen isotope gas into the storage container, and the voltage application device includes: The radiography apparatus according to any one of claims 1 to 4, wherein a negative voltage is applied to the second electrode.

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