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Prototype Mn-solution bath for low activity primary standard neutron dosimetry
Journal of Radioanalytical and Nuclear Chemistry ( IF 1.6 ) Pub Date : 2020-10-10 , DOI: 10.1007/s10967-020-07405-0
A. R. El-Sersy , M. A. Hassan , Khaled Mostafa , A. Abdelsalam , W. Osman

In this work, a prototype Mn-bath was designed and constructed in our laboratory. It is composed of a spherical 304 stainless steel vessel with a diameter of 34 cm. A hydraulic system for circulating the 55Mn solution between the bath and the detection system. The detection system is composed of a Marinelli beaker attached to a 3 × 3″ NaI(TI) crystal detector connected to the Nomad analyzer. A 252Cf source with a flux of order 103 (n cm−2 S−1) was used. The output dose was measured by a standard NM2 neutron monitor. The output flux was calculated from the flux-dose relationship. It was found that the flux delivered by the used 252Cf was 170.56 ± 6.41 n cm−2 S−1as calculated from the dose measured by NM2. Different concentrations of 55Mn solution with the molarity of 0.89,1.18 and 1.48 (mol/l) extracted a flux of 194.48, 186.46, and 169.79 n cm−2 S−1, respectively. Data of neutron flux obtained from concentrations of 1.18 and 1.48 mol/l was in a good agreement with the flux measured by the standard neutron monitor and the guaranteed value of the used source. Uncertainty of flux measured by Mn bath was enhanced with increased concentration.

中文翻译:

用于低活度初级标准中子剂量测定的原型锰溶液浴

在这项工作中,我们实验室设计并建造了原型锰浴。它由一个直径为 34 厘米的球形 304 不锈钢容器组成。用于在浴槽和检测系统之间循环 55Mn 溶液的液压系统。检测系统由一个 Marinelli 烧杯组成,该烧杯连接到连接到 Nomad 分析仪的 3 × 3" NaI(TI) 晶体检测器。使用了通量为 103 (n cm-2 S-1) 的 252Cf 源。输出剂量由标准 NM2 中子监测器测量。根据通量-剂量关系计算输出通量。发现使用的 252Cf 提供的通量为 170.56 ± 6.41 n cm-2 S-1,根据 NM2 测量的剂量计算。摩尔浓度为0.89、1.18和1.48(mol/l)的不同浓度的55Mn溶液提取的通量分别为194.48、186.46和169。分别为 79 n cm-2 S-1。从浓度为 1.18 和 1.48 mol/l 获得的中子通量数据与标准中子监测仪测量的通量和所用源的保证值非常吻合。Mn 熔池测得的熔剂的不确定度随着浓度的增加而增加。
更新日期:2020-10-10
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