Plant transfer factors of naturally occurring radioactive decay series radionuclides, 7Be, and 137Cs in a semi-arid climate

IF 1.6 3区工程技术 Q3 CHEMISTRY, INORGANIC & NUCLEAR Applied Radiation and Isotopes Pub Date : 2024-12-09 DOI:10.1016/j.apradiso.2024.111616

V.M. Expósito-Suárez , J.A. Suárez-Navarro , E. Fernández , M. Barragán , O.C. Lind , J. Mantero , R. García-Tenorio

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Abstract

Arid and semi-arid climates give rise to drought stress in plants, implying an increased uptake of radionuclides through both leaves and roots. This study was carried out in the Tabernas Desert (Almería, Spain), classified as an arid climate. Seventeen plants were analyzed, collected from four areas of the study site. The soils in the four areas were statistically comparable and showed a chemical composition and activity concentrations characteristic of uncontaminated soils, with activity concentrations corresponding to world averages, i.e., 31 ± 4 Bq·kg⁻¹ for the uranium series, 37 ± 4 Bq·kg⁻¹ for thorium one, and 344 ± 17 Bq·kg⁻¹ for ⁴⁰K. Conversely, the soils showed that ⁷Be was below the limit of detection, levels of ¹³⁷Cs equivalent to fallout, but an average ²¹⁰Pb_ex of 19 ± 9 Bq·kg⁻¹. The radionuclides of the three naturally occurring radioactive decay series are mainly present in the insoluble fraction, with ²²⁶Ra being the most abundant. The transfer factors showed the usual behaviour of Cs > Ra > U > Th. The activity concentrations of ⁷Be and ²¹⁰Pb showed a statistically significant linear relationship, indicating greater incorporation through the plant leaves.

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半干旱气候中天然产生的放射性衰变系列放射性核素、7Be 和 137Cs 的植物转移因子。

干旱和半干旱气候会引起植物的干旱胁迫，这意味着通过叶片和根系对放射性核素的吸收增加。这项研究是在被归类为干旱气候的塔伯纳斯沙漠（Almería，西班牙）进行的。研究人员分析了从研究地点的四个地区收集的17种植物。4个地区土壤的化学成分和活性浓度具有统计学上的可比性，与世界平均水平相对应，铀系为31±4 Bq·kg-1，钍系为37±4 Bq·kg-1, 40K为344±17 Bq·kg-1。相反，7Be低于检测限值，137Cs水平相当于沉降物，但平均210Pbex为19±9 Bq·kg-1。三种自然发生的放射性衰变系列的放射性核素主要存在于不溶性部分，其中226Ra含量最多。传递因子表现为Cs > Ra > U > Th。7Be和210Pb的活性浓度呈显著的线性关系，表明7Be和210Pb通过叶片的掺入量较大。

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来源期刊

Applied Radiation and Isotopes 工程技术-核科学技术

CiteScore

3.00

自引率

12.50%

发文量

406

审稿时长

13.5 months

期刊介绍： Applied Radiation and Isotopes provides a high quality medium for the publication of substantial, original and scientific and technological papers on the development and peaceful application of nuclear, radiation and radionuclide techniques in chemistry, physics, biochemistry, biology, medicine, security, engineering and in the earth, planetary and environmental sciences, all including dosimetry. Nuclear techniques are defined in the broadest sense and both experimental and theoretical papers are welcome. They include the development and use of α- and β-particles, X-rays and γ-rays, neutrons and other nuclear particles and radiations from all sources, including radionuclides, synchrotron sources, cyclotrons and reactors and from the natural environment. The journal aims to publish papers with significance to an international audience, containing substantial novelty and scientific impact. The Editors reserve the rights to reject, with or without external review, papers that do not meet these criteria. Papers dealing with radiation processing, i.e., where radiation is used to bring about a biological, chemical or physical change in a material, should be directed to our sister journal Radiation Physics and Chemistry.