Patent Number: 
Section: claims

1. A radiation imaging apparatus comprising:a radiation detection panel configured to detect radiation irradiated by a radiation generation unit;a first member and second member arranged on a radiation-incident direction side;a third member and fourth member arranged on a side opposite to the radiation-incident direction side; anda housing containing the radiation detection panel and at least the fourth member,wherein the fourth member is configured as a base which supports the radiation detection panel, andwherein the second member is arranged between the first member and the radiation detection panel,the third member is arranged between the radiation detection panel and the fourth member and in contact with the radiation detection panel,the second member and the third member are lower in elastic modulus than the first member and the fourth member, andthe elastic modulus of the second member is lower than the elastic modulus of the third member. 2. The radiation imaging apparatus according to claim 1, wherein a plate thickness of the second member is not smaller than a plate thickness of the third member. 3. The radiation imaging apparatus according to claim 1, wherein a rigidity of the second member is lower than a rigidity of the third member. 4. The radiation imaging apparatus according to claim 1, wherein the fourth member has a rigidity higher than the rigidity of the first member. 5. The radiation imaging apparatus according to claim 1, wherein a rigidity of the radiation detection panel is lower than the rigidity of the first member and the rigidity of the fourth member. 6. The radiation imaging apparatus according to claim 1, wherein an area of each of the first member and the fourth member is not smaller than an area of the radiation detection panel when viewed from the radiation-incident direction. 7. The radiation imaging apparatus according to claim 1, wherein the radiation detection panel is constituted by integrating at least the first member, the second member, the third member, and the fourth member with the radiation detection panel. 8. The radiation imaging apparatus according to claim 1, wherein a rigidity of an integrated structure of the first member and second member arranged in the incident direction of the radiation is lower than a rigidity of an integrated structure of the third member and fourth member arranged on the side opposite to the incident direction of the radiation. 9. The radiation imaging apparatus according to claim 1, wherein the first member is part of the housing. 10. The radiation imaging apparatus according to claim 1, wherein the fourth member is a member supporting a control unit configured to process data detected by the radiation detection panel. 11. The radiation imaging apparatus according to claim 1, wherein a radiation shielding member is arranged between the fourth member and the third member. 12. The radiation imaging apparatus according to claim 11, wherein the radiation shielding member is constituted using a material containing at least one heavy metal selected from the group consisting of lead (Pb), barium (Ba), tantalum (Ta), molybdenum (Mo), and tungsten (W), or stainless steel. 13. The radiation imaging apparatus according to claim 1, wherein the second member and the third member are constituted by buffer materials. 14. The radiation imaging apparatus according to claim 1, wherein the fourth member is fastened to the housing.