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Evaluation for low energy γ proportion of cobalt source high dose rate field based on plane-parallel ionization chamber
- NUCLEAR TECHNIQUES Vol. 41, Issue 7, Article number: 070201(2018)
- 作者机构：
中国工程物理研究院 核物理与化学研究所 绵阳 621900
- 作者简介：
- 基金信息：
DOI：10.11889/j.0253-3219.2018.hjs.41.070201
CLC： TL929;TB114.1Received：20 December 2016，
Revised：09 July 2017，
Published：10 July 2018
- 稿件说明：
移动端阅览
Lei LI, Jianmin SHI, Na YANG, et al. Evaluation for low energy γ proportion of cobalt source high dose rate field based on plane-parallel ionization chamber[J]. Nuclear techniques, 2018, 41(7): 070201
Lei LI, Jianmin SHI, Na YANG, et al. Evaluation for low energy γ proportion of cobalt source high dose rate field based on plane-parallel ionization chamber[J]. Nuclear techniques, 2018, 41(7): 070201 DOI： 10.11889/j.0253-3219.2018.hjs.41.070201.
摘要
利用重金属工艺可提高器件可靠性，低能γ将使器件高
Z
/低
Z
界面附近产生剂量增强效应，影响器件抗辐射性能评估。介绍了一种强钴源低能散射γ成分评价方法，利用铝单层室壁/金铝双层室壁平板型电离室辐射电流比值对γ能量敏感的特性，通过比较电流比值实测与参考值的差异，估计散射γ（≤300keV）成分是否过多，典型钴源能谱计算结果表明：参考值可取为2.8。研制了量程为0.01~2.3Gy·s
-1
（Si）的电离室探头，搭建了长距离辐射电流测量系统。单板钴源实验结果表明：空场条件和铅铝容器（散射抑制）内辐射电流比值实测结果与预期相符，方法可行；能够检验能谱硬化技术的有效性；可从剂量角度关联不同辐射场或相同辐射场不同辐照工位。
Abstract
Background
2
Heavy metal process is widely used to improve the reliability of electronic devices
which introduces interface formed by high
Z
and low
Z
material. There will be dose enhancement effect within region near such interface when exposing to low energy γ-ray field. This phenomenon could affect the reliability of hardness assurance tests.
Purpose
2
A method was introduced to evaluate the proportion of low energy scattering γ-ray within high dose rate irradiation field formed by cobalt source.
Methods
2
Two types of ionization chambers were designed
which utilize single layer Al(aluminum) wall and double layers Au(gold)/Al wall respectively. The γ-ray induced current of the latter ionization chamber varied more rapidly with the change of γ-ray energy than the former one. Consequently
the ratio of those two currents was sensitive to γ-ray energy
and the variation between measured and reference value of ratio could indicate whether the proportion of low energy γ-ray was over expectation obviously.
Results
2
It was advised that the reference value could be set as 2.8 based on analysis of typical energy spectrums of cobalt source. In addition
an ionization chamber dosimeter system with the range of 0.01~2.3Gy·s
-1
(Si) was designed with which the ratios were measured in free field and Pb(lead)/Al box reducing the amount of low energy γ-ray. There was an agreement between experimental and calculated results.
Conclusion
2
The method is effective for evaluating the proportion of scattering γ-ray and the effectiveness of spectral hardening technology. Furthermore
it could help correlate different irradiation fields or irradiation positions within specific irradiation field from the aspect of irradiation dose.
关键词
Keywords
references
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