Study on the homogeneity of preparation of reference radioactive soil by artificial addition

Lijun XU; Hongsheng YE; Lijun DIAO; Weidong ZHANG; Rui LUO; Ming LI; Min LIN; Xinpeng SONG; Wen XIA; Yizhen CHEN; Zhenhong XIAO; Kesheng CHEN

doi:10.11889/j.0253-3219.2018.hjs.41.090502

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Study on the homogeneity of preparation of reference radioactive soil by artificial addition

NUCLEAR PHYSICS, INTERDISCIPLINARY RESEARCH | 更新时间：2021-05-19

- Study on the homogeneity of preparation of reference radioactive soil by artificial addition
- NUCLEAR TECHNIQUES Vol. 41, Issue 9, Article number: 090502(2018)
- 作者机构：
  
  中国原子能科学研究院计量与校准技术重点实验室北京 102413
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2018.hjs.41.090502
  CLC： TL84
- Received：20 April 2018，
  
  Revised：23 May 2018，
  
  Published：2018-09
- 稿件说明：
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Lijun XU, Hongsheng YE, Lijun DIAO, et al. Study on the homogeneity of preparation of reference radioactive soil by artificial addition[J]. Nuclear techniques, 2018, 41(9): 090502
DOI：

Lijun XU, Hongsheng YE, Lijun DIAO, et al. Study on the homogeneity of preparation of reference radioactive soil by artificial addition[J]. Nuclear techniques, 2018, 41(9): 090502 DOI： 10.11889/j.0253-3219.2018.hjs.41.090502.

摘要

在核事故的条件下，边界土壤中的放射性分布难以确定，需研制一种含

Co、

Sr、

137

Cs、

241

Am等多种放射性核素的土壤标准物质，用于分析过程中的监督和校准。由于满足条件的受偶然放射性污染的土壤较难寻找，故采用人工添加目标放射性核素的方法制备放射性土壤标准物质。在制备过程中，土壤局部组成和颗粒大小的差异对所添加核素的吸附差别可能形成所谓的"热点"，造成最终标准物质的均匀性检验无法通过。为解决该难题，选择几个核素进行逐级添加与稀释制备土壤标准物质，并研究其在不同步骤中如溶液和固体粉末混合时和固体粉末的逐级稀释时的均匀性。通过单因素方差分析方法的检验证明，在制备方法进行改进后其均匀性满足要求，为下一步的正式制备奠定基础。

Abstract

Background

Under the condition of nuclear accident

the distribution of radioactivity in the boundary soil is difficult to be determined. It is necessary to develop a reference soil that has a variety of radionuclides such as

137

241

and so on.

Purpose

Due to the fact that the soil contaminated by accidental radioactivity is difficult to find

it is proposed to use artificial addition of radionuclides to prepare the reference soil.

Methods

The difference in the local composition of the soil and the difference in particle size with respect to the adsorption of radionuclide may form a so-called "hot spot"

resulting in inhomogeneity. In order to solve this problem

three nuclides

Sr and

137

Cs are selected for the preparation with stepwise addition method.

Results

Three groups and eighteen times of measurement data for each nuclide were calculated in a homogeneity test with

-value exam. The result is

≤

which meets the requirements.

Conclusion

The homogeneity of the reference material can be solved by an improvement method:1) changing the aqueous solution to an organic-aqueous solution in the first step of mixing; 2) using a ball milling mixing method instead of the three-dimensional mixing method in the mixing of the soil powders.

关键词

Keywords

references

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