Survey meter combining CVD diamond and silicon detectors for wide range of dose rates and high accumulated doses

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• 作者：Hidenori Sato^a ; ^b ; ^{sato3837@hitachi-aloka.co.jp} ; Akihito Yamaguchi^b ; Osamu Maida^a ; Toshimichi Ito^a
• 关键词：CVD diamond ; Self-standing diamond film ; Diamond detector ; Survey meter ; Radiation hardness ; Dose rate linearity
• 刊名：Radiation Measurements
• 出版年：2012
• 期刊代码：71_13504487
• 类别：ce
• 出版时间：April, 2012
• 卷：47
• 期：4
• 页码：266-271
• 文件大小：425 K

摘要

We have developed a prototype of a survey meter combining a CVD diamond detector and silicon detectors to appropriately take temporal measurements of 纬-ray radiations over a wide range of the dose rates and to measure high accumulated doses of 纬-ray radiations. In order to carry out this, at first, we have studied the radiation hardness of diamond detectors suitably fabricated with high-quality single-crystalline CVD diamond films to confirm that such CVD diamond detectors have greatly superior radiation hardness, compared with commercially available silicon detectors. It is evidenced that the performance of the CVD diamond detector did not significantly change even after heavy 纬-ray irradiation of 0.7聽MGy while the silicon detectors have a remarkable increase in the dark current, a detection peak shift to the low energy side, and a decrease in detection counts for 5.486-MeV 伪 particles. Due to a size limitation of the CVD diamond detector, such a CVD diamond detector was combined with six commercially available silicon detectors to fabricate a survey meter which can appropriately work under severe irradiation conditions, or, at accumulated doses larger than at least 0.5聽MGy and which can cover a wide range of the dose rates from 1聽渭Gy/h to at least 1聽kGy/h. The prototype survey meter had a practically useful linearity in this dose rate range. Thus, we have confirmed that such a diamond-Si combined survey meter can be put into practical use.