[2D06-08] Semiconductor in Radiation Application

[2D07] Feasibility study on neutron dosimetry under extreme radiation environments using a diamond detector

*Masayuki Hagiwara^1,2, Xiuqing Xu², Takahiro Oyama¹, Hiroshi Yashima³, So Kamada⁴ (1. KEK, 2. SOKENDAI, 3. Kyoto Univ., 4. NMRI)

Keywords:Mixed radiation field, Fuel Debris

We have been developing a prototype of submerged remotely operated vehicle (ROV) integrated with a neutron detector and sonars in collaboration with Japanese experts from KEK, NIMS and NMRI, targeting the localization and characterization of the fuel debris at the Fukushima Daiich Nuclear Power plants on site. For the neutron detector, a thin diamond detector coated by a neutron convertor is selected, because it could measure neutron events associated with the debris apart from huge γ-ray events by 137Cs widely-dispersed throughout the primary containment vessel. We will report on the feasibility study with the commercially-available CVD diamond detectors (B6-C by CIVIDEC) with thickness of 0.025 and 0.14 mm for the neutron and gamma-ray responses.