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Description:

We report on the membrane diamond detector, which consists of 5 μm-thick diamond p-i-n diodes and a dedicated front-end ASIC, fabricated in a 65 nm CMOS technology. The p-i-n diode has an attractive feature for low γ-ray sensitivities due to its extremely thin drift layer, which is difficult to form by etching of bulk diamond with a Metal-Insulator-Metal structure. The pseudo-vertical p-i-n diode structure was formed on the single crystal diamond {111} substrate by MWCVD and dry-etching process. The readout electronics was designed to meet specifications for real-time neutron monitoring in harsh γ-ray environments. The prototype system was evaluated in charge distribution measurements induced by α-particles from 241 Am. The charge spectra were successfully obtained from multi-channels, each of which has a diameter of 250 μm aligning in a pixel matrix. By combining with neutron converters, e.g ., 10 B or 7 Li, we expect the detector system as a good candidate for detecting spontaneous fission neutrons, emitted from submerged fuel debris at the Fukushima Daiichi Nuclear Power Plant in Japan.

Rights:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

Keyword: Diamond, Nuclear power plant, alpha particle, gamma ray

Date published: 2023-10-03

Publisher: Informa UK Limited

Journal:

• Journal of Nuclear Science and Technology (ISSN: 18811248) p. 1285-1291
• JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY (ISSN: 00223131) vol. 60 issue. 10 p. 1285-1291

Funding:

• KAKENHI 22H01255
• Center of World Intelligence Project for Nuclear Sci- ence/Technology and Human Resource Development 30I123

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1080/00223131.2023.2190548

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Updated at: 2024-02-07 15:14:37 +0900

Published on MDR: 2024-02-07 16:30:25 +0900