Total ionizing dose effects on the SOI pixel sensor for X-ray astronomical use
Total ionizing dose effects on the SOI pixel sensor for X-ray astronomical use
复制标题
总电离剂量对 X 射线天文用途 SOI 像素传感器的影响
DOI：
10.1016/j.nima.2018.07.057
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Shinya N
中科院分区：
文献类型：
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作者：
Koji Mori;Yusuke Nishioka;Ayaki Takeda;Nobuaki Takebayashi;Ryota Takenaka;Seina Sakakura;Shoma Yokoyama;Kohei Fukuda;Masataka Yukumoto;Takahiro Hida;Takeshi G. Tsuru;Takaaki Tanaka;Hideaki Matsumura;Hideki Hayashi;Takayoshi Kohmura;Shinya N
我们报告了总电离剂量对x射线SOI像素传感器XRPIX的影响。XRPIX是一种用于空间x射线天文应用的成像光谱仪。正面和背面照明（FI和BI）装置用硬x射线照射，x射线来自30kv的x射线管，带有钼靶。我们发现，作为辐射暴露的函数，BI设备的读出噪声的降解率大约比FI设备慢三倍。然而，当读出噪声作为埋藏氧化层吸收剂量的函数进行评估时，这两种类型的装置实际上是相同的。基座和模数转换增益也显示出类似的趋势。这些结果表明，BI型器件作为x射线反射镜的焦平面传感器具有较高的辐射容限，而XRPIX器件的辐射容限受D BOX控制。在D BOX中，读数噪声在1 krad左右时保持稳定，在10 krad时增加10%左右，并在进一步辐照下继续增加。如果我们使用半功率直径为10弧秒、焦距为10米的x射线反射镜，那么D BOX中的10克拉，这个实验中合理的辐射容忍阈值相当于在轨道上运行三年以上，这通常是星载传感器所需要的。
We report on total ionizing dose effects on the X-ray SOI pixel sensor, XRPIX. XRPIX has been developed as an imaging spectrometer for X-ray astronomical use in space. Front-and back-illuminated (FI and BI) devices were irradiated with hard X-rays from an X-ray tube operated at 30 kV with a Molybdenum target. We found that the degradation rate of the readout noise of the BI device was approximately three times slower than that of the FI device as a function of radiation exposure. Those of both type of devices, however, were virtually identical when the readout noise was evaluated as a function of the absorbed dose at the buried oxide layer, D BOX. The pedestal and analog-to-digital conversion gain also displayed similar tendencies. These results demonstrate that BI type devices have a higher radiation tolerance as a focal plane sensor of an X-ray mirror and the radiation tolerance of XRPIX devices is governed by D BOX. The readout noise was stable up to about 1 krad in D BOX, increased by about 10% at 10 krad in D BOX, and continued to increase under further irradiation. If we employ an X-ray mirror with a half-power diameter of 10 arcsec and a focal length of 10 m, 10 krad in D BOX, a reasonable threshold of radiation tolerance in this experiment, is equivalent to more than three years in orbit, typically required of space-borne sensors.