Radiation detection device
A radiation detection device is provided that is wide in visual field, wide in application range of radiation energy, and which is smaller and lighter in weight as compared to other devices. The device includes a detecting element group has a plurality of detecting elements that detect radiation are three-dimensionally arranged. The detecting element group has a structure with a depletion formed by removing the detecting element at any position from a virtual detecting element group in which the detecting elements are laid out on any virtual surface. The depletion is provided at a position at which a difference of detected values between one detecting element and another detecting element arranged along any direction exhibits different values in a case where the radiation having the direction as an incident direction enters and a case where the radiation having an opposite direction of the direction as an incident direction enters.
1 . A radiation detection device comprising:
a detecting element group in which a plurality of detecting elements that detect radiation are three-dimensionally arranged,
wherein the detecting element group has a structure provided with a depletion formed by removing the detecting element at any position from a virtual detecting element group in which the detecting elements are laid out on any virtual surface,
wherein the virtual surface includes a first virtual surface and a second virtual surface, the second virtual surface being opposed to the first virtual surface,
wherein the detecting element group includes a first detecting element group arranged on the first virtual surface and a second detecting element group arranged on the second virtual surface, and
wherein the first detecting element group and the second detecting element group include respective first detecting elements arranged at mutually different positions viewed in a normal direction of the first virtual surface and the second virtual surface, and at least a second detecting element of the first detecting element group is arranged in a same position in the normal direction as another detecting element of the second detecting element group.
2 . The radiation detection device according to claim 1 , wherein at least a part of the depletions is provided with a shielding member that shields against the radiation.
3 . The radiation detection device according to claim 1 , wherein the first virtual flat surface and the second virtual surface are arranged to be approximately mutually parallel; and wherein the first virtual surface and the second virtual surface mutually have approximately a same square shape.
4 . The radiation detection device according to claim 1 , wherein one of the first virtual surface and the second virtual surface includes a virtual curved surface in a shape of a hemisphere surface.
5 . The radiation detection device according to claim 1 , further comprising an arithmetic processing unit, wherein the arithmetic processing unit includes a hardware processor that acquires a spatial intensity distribution of the radiation in the detecting element group based on respective detected values of the plurality of detecting elements and estimates a source location of the radiation based on an acquisition result of the intensity distribution.
6 . The radiation detection device according to claim 5 , wherein the hardware processor uses an estimation model that estimates the source location from the acquisition result of the intensity distribution, and wherein the estimation model is a model preliminarily generated through a machine learning based on training data in which the intensity distribution acquired for each incidence angle of the radiation to the detecting element group is associated with the source location at the acquisition of the intensity distribution.
7 . The radiation detection device according to claim 1 , wherein the first virtual surface and the second virtual surface are flat surfaces.
8 . The radiation detection device according to claim 1 , wherein the virtual surface further includes a third virtual surface opposed to the second virtual surface, the detecting element group includes a third detecting element group in which the detecting element and the depletion are arranged on the third virtual surface, and at least a first one of the detecting elements in the third detecting element group, the at least a first one of the detecting elements in the first detecting element group, and the at least the first one of the detecting elements in the second detecting element group are arranged at mutually different positions viewed in the normal direction.