PURPOSE: To measure easily distribution of radiation energy and its intensity distribution, by using a solid-state image sensing element having a signal accumulating function.

CONSTITUTION: A semiconductor substrate 6 is provided with a solid-state image sensing element having a signal accumulating function for forming CCD consisting of a detection part 61, an accumulation part 62, and a reading part 63, etc. Accordingly, energy distribution and intensity distribution of radiation rays incident in parallel to the substrate 6 are measured easily through a data processor 9, an anergy distribution display device 10, an intensity distribution display device 11, etc. without using amplifiers, etc., corresponding to each element.