| 摘要 |
PURPOSE:To generate a three-dimensional distribution image of gamma ray source by calculating the conical surface indicating the ray source position from the gamma ray incidence position which is detected by two detectors, loss energy, the arrival position of passing gammarays, counting up the counter value of each position of the conical surface for each incidence, and then counting up the counter value when it matches a specific value. CONSTITUTION:A detector 1 is provided with two detection systems 2 and 3 at front and rear stages. A position calculation part 10 calculates the gamma ray incidence position from the output of the detection system 2 and an addition part 11 calculates energy loss. A position calculation part 12 calculates the gamma ray arrival position from the output of the detection system 3. A conical calculation part 13 calculates the connection of the incidence position and the arrival position, obtains the scattering angle according to energy loss, and then obtains the conical surface as the possible range of gamma ray source. A memory control part 14 counts up the value in a memory 15 every time the counter value of each position on the conical surface enters, a ray source estimation part 16 counts up the value in a memory 17 as being a high ray source possibility for one whose counter value matches a specific value, and then a three-dimensional distribution image of the ray source is created.
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