Evaluation of a microdosimetric-based neutron instrument
Evaluation of a microdosimetric-based neutron instrument
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DOI：
10.1093/oxfordjournals.rpd.a033051
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发表时间：
2000-01-01
影响因子：
1
通讯作者：
Liu, JC
中科院分区：
文献类型：
--
作者：
Liu, JC
市售的REM 500中子测量仪是一种基于使用低压组织等效正比计数器的微剂量测量仪器。用五种放射性同位素中子源（（238）pULi、（PuF）-Pu-238、（PuB）-Pu-238、（PuBe）-Pu-236和Cf-252）和单能14 MeV中子评价了REM 500测量适当微剂量谱的能力以及剂量当量响应。响应（计数.mSv（-1））和灵敏度（计数每中子）作为平均中子能量的函数进行了测定。基于测量的脉冲高度谱，频率平均和剂量平均线性能量值，以及平均品质因子，推导出所有源。用REM 500测量的剂量和平均品质因子确定的中子剂量当量与ICRP 21中子源最大剂量当量参考值吻合较好。然而，对于REM 500在加速器场中测量适当的线性谱，对于高能中子的低灵敏度和不准确的测量是可能需要改进的区域。
The commercially available REM500 neutron survey meter is a microdosimetric instrument based on the use of a low-pressure tissue-equivalent proportional counter. The ability to measure proper microdosimetric spectra, as well as the dose equivalent response, of the REM500 was evaluated with five radioisotopic neutron sources ((238)pULi, (PuF)-Pu-238, (PuB)-Pu-238, (PuBe)-Pu-236 and Cf-252) and the monoenergetic 14 MeV neutrons. The response (counts.mSv(-1)) and sensitivity (counts per neutron) as a function of average neutron energy were determined. Based on the measured pulse height spectra, the frequency-mean and dose-mean lineal energy values, as well as the mean quality factors, were derived for all sources. The neutron dose equivalent determined using both the dose and mean quality factor measured by the REM500 agreed well with the neutron sources' reference values of ICRP 21 maximum dose equivalent. However, for the REM500 to measure proper lineal spectra in accelerator fields, the low sensitivity and inaccurate measurements for high energy neutrons are areas that may need improvement.