巴基斯坦北部喀喇昆仑山主脉沿线的伽马辐射水平

IF 1.4 3区 化学 Q4 CHEMISTRY, INORGANIC & NUCLEAR Radiochimica Acta Pub Date : 2023-12-07 DOI:10.1515/ract-2023-0229
Mohammad Wasim, Arfan Tariq, Manzoor Ali
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引用次数: 0

摘要

本文记录了巴基斯坦北部喀喇昆仑山脉主喀喇昆仑山脉(MKT)附近地区天然放射性核素的分布情况。研究了 30 个样本中三种天然放射性核素(226Ra、232Th 和 40K)和一种人为放射性核素(137Cs)的比活度。测量是通过高分辨率伽马射线光谱仪进行的。采样区位于巴基斯坦吉尔吉特-巴尔蒂斯坦省,海拔 1838 米/6030 英尺。MKT 将喀喇昆仑板块与南部的科希 斯坦-拉达克地层和印度板块分隔开来。226Ra、232Th、137Cs 和 40K 的比活度分别为 4.5-56.5 Bq kg-1、18.2-61.4 Bq kg-1、1.4-19.6 Bq kg-1 和 51-1640 Bq kg-1。平均镭当量活度为 127.8 ± 45.9 Bq kg-1。所有样品的外部危害指数为 1,大多数样品的代表性水平指数为 1。平均空气吸收剂量率为 60.9 ± 23.2 nGy h-1,室外有效剂量率为 73.7 ± 28.0 μSv y-1。这些数值略高于空气吸收剂量率(51 nGy h-1)和室外年有效剂量率(70 μSv y-1)的世界平均值。数据显示,226Ra 和 40K 之间存在明显的正相关关系。主成分分析显示了样本的分布模式,并确定了三个不同的组别。数据还评估了铀、钍和钾的浓度及其比率。
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Gamma-radiation levels along the main Karakorum thrust area of Northern Pakistan
In this contribution, the distribution of naturally occurring radionuclides in the area around Main Karakoram Thrust (MKT) in Karakoram Range, North Pakistan is documented. Three natural radionuclides (226Ra, 232Th, and 40K) and one anthropogenic radionuclide (137Cs) were studied for their specific activities in 30 samples. The measurements were made by high resolution gamma-ray spectrometry. The sampling area is located in Gilgit Baltistan province of Pakistan at an altitude of 1838 m/6030 ft above sea level. MKT separates the Karakoram plate from the Kohistan-Ladakh Terranes and Indian Plate to the south. The specific activity varied as 4.5–56.5 Bq kg−1, 18.2–61.4 Bq kg−1, 1.4–19.6 Bq kg−1 and 51–1640 Bq kg−1 for 226Ra, 232Th, 137Cs and 40K, respectively. The average radium equivalent activity was 127.8 ± 45.9 Bq kg−1. The external hazard index was <1 for all samples and representative level index was <1 for majority of the samples. The average air absorbed dose rate was 60.9 ± 23.2 nGy h−1 corresponding to the outdoor effective dose rate of 73.7 ± 28.0 μSv y−1. These values were slightly higher than the world average values for air absorbed dose rate (51 nGy h−1) and outdoor annual effective dose rate (70 μSv y−1). The data revealed significant positive correlation between 226Ra and 40K. Principal component analysis revealed distribution patterns within the samples and identified three distinct groups. Data was also evaluated for the concentrations of uranium, thorium and potassium and their ratios.
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来源期刊
Radiochimica Acta
Radiochimica Acta 化学-核科学技术
CiteScore
2.90
自引率
16.70%
发文量
78
审稿时长
6 months
期刊介绍: Radiochimica Acta publishes manuscripts encompassing chemical aspects of nuclear science and technology.
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