土壤样品化学成分比例对预处理方法(直接法、AMP)和 MDA 的影响分析

IF 0.8 4区 物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY
Eun-Sung Jang
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引用次数: 0

摘要

通过分析土壤样品的化学成分,并利用直接法和 AMP 有效去除样品中的铯同位素自发放射性核素,测得 MDA 值,并与直接法进行比较,分析和评估其可降低的程度。在标准科学研究所,将 37 kBq/kg 的 134Cs 水溶液稀释到蒸馏水中,制备成 500、1000、2500 和 5000 Bq/kg 的水溶液,作为标准土壤样品。由于使用 AMP 试剂对土壤样本进行了 AMP 预处理,并减少了化学预处理过程中可能造成的铯同位素损失,因此取得了平均 89.5%的令人满意的结果。在校准后测量标准土壤样本,结果非常令人满意,与标准样本至少相差 0 至 5 Bq/kg。此外,三种方法(直接法、AMP)校正后的效率测量值与蒙特卡罗值相比,不确定度在 3% 以内,吻合度很高。本底、样品测量时间和回收率等多种因素都会影响 MDA 值,特别是当放射性浓度高于 2500 Bq/kg 时,通过缩短测量时间,可以降低 MDA 值。随着样品量的增加,由于自吸收效应,效率明显降低。因此,可以肯定的是,土壤类型和成分比例越高,放射性浓度受到的影响越大。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Analysis of the effect of the chemical composition ratio of soil samples on pretreatment methods (direct method, AMP) and MDA

Analysis of the effect of the chemical composition ratio of soil samples on pretreatment methods (direct method, AMP) and MDA

By analyzing the chemical composition of soil samples and effectively removing spontaneous radionuclides of cesium isotopes from the samples using the direct method and AMP, the MDA value is measured and compared with the direct method, and how much it can be reduced is analyzed and evaluated. A standard soil sample was made by diluting 37 kBq/kg of 134Cs aqueous solution in distilled water to prepare 500, 1000, 2500, and 5000 Bq/kg of aqueous solution at the Institute of Standard Science. As a result of AMP pretreatment using soil samples and reducing the loss of cesium isotopes that may occur during chemical pretreatment using AMP reagents, a satisfactory result of an average of 89.5% was obtained. As a result of measuring the standard soil sample after calibration, a very satisfactory result could be derived with a difference of at least 0 to 5 Bq/kg from the standard sample. In addition, the efficiency measurements in the three methods (direct method, AMP) after correction showed uncertainty within 3% compared to Monte Carlo values, which matched well. Several factors, such as background, sample measurement time, and recovery rate, affect the MDA value, especially when the radioactivity concentration is above 2500 Bq/kg, by shortening the measurement time, MDA values can be reduced. As the amount of sample increased, the efficiency decreased clearly due to the self-absorption effect. Therefore, it was confirmed that the higher the soil type and component ratio, the more the radioactive concentration was affected.

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来源期刊
Journal of the Korean Physical Society
Journal of the Korean Physical Society PHYSICS, MULTIDISCIPLINARY-
CiteScore
1.20
自引率
16.70%
发文量
276
审稿时长
5.5 months
期刊介绍: The Journal of the Korean Physical Society (JKPS) covers all fields of physics spanning from statistical physics and condensed matter physics to particle physics. The manuscript to be published in JKPS is required to hold the originality, significance, and recent completeness. The journal is composed of Full paper, Letters, and Brief sections. In addition, featured articles with outstanding results are selected by the Editorial board and introduced in the online version. For emphasis on aspect of international journal, several world-distinguished researchers join the Editorial board. High quality of papers may be express-published when it is recommended or requested.
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