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Spatial distribution of natural and artificial radioactivity concentrations in soil samples and statistical approach, Nevşehir, Turkey
Radiochimica Acta ( IF 1.8 ) Pub Date : 2020-11-26 , DOI: 10.1515/ract-2020-0061
Nesli Bingöldağ 1 , Pelin Otansev 2
Affiliation  

Abstract The concentrations of 226Ra, 232Th, 40K and 137Cs radionuclides in soil samples collected from 323 different regions of Nevşehir province were determined by using a gamma spectrometer with an HPGe detector. The mean gamma activity concentrations (ranges) of 226Ra, 232Th, 40K and 137Cs for districts were determined as 49.45 (7.40–193.90), 54.08 (<2.8–122.50), 698.43 (37.67–1370.20) and 8.26 (0.10–52.60) Bq kg−1, respectively. The mean activity concentrations of 226Ra, 232Th and 40K were higher than the world mean value. According to Kolmogorov–Smirnov test, distributions of 226Ra, 232Th and 137Cs show log-normal distributions. Whereas, 40K shows normal distribution. The mean radium equivalent activity was 181.68 Bq kg−1 which is lower than the recommended maximum value of 370 Bq kg−1. The mean external terrestrial gamma dose rate was found to be 85.12 nGy h−1. The calculated external hazard value was 0.49 and within the acceptable limit which is less than unity (Hex ≤ 1). Thermo Scientific RadEye NBR detector was used to determine environmental gamma dose rates. The gamma dose rates were measured at 445 points at a height of 1 m from land surface. The mean outdoor gamma dose rate (range) was found as 150.13 (50–480) nGy h−1. This mean value was found higher than world mean value. The fact that most of the Nevşehir province is based on volcanic rocks explains why the gamma dose rates are high.

中文翻译:

土壤样品中自然和人工放射性浓度的空间分布和统计方法,土耳其内夫谢希尔

摘要 利用伽马光谱仪和HPGe 探测器测定了从内夫谢希尔省323 个不同地区采集的土壤样品中226Ra、232Th、40K 和137Cs 放射性核素的浓度。各地区 226Ra、232Th、40K 和 137Cs 的平均 γ 活性浓度(范围)确定为 49.45 (7.40–193.90)、54.08 (<2.8–122.50)、698.43 (37.67.06) 和 q.82–106 (B)。 kg-1,分别。226Ra、232Th和40K的平均活性浓度均高于世界平均值。根据 Kolmogorov-Smirnov 检验,226Ra、232Th 和 137Cs 的分布呈现对数正态分布。而 40K 显示正态分布。平均镭当量活度为 181.68 Bq kg-1,低于推荐的最大值 370 Bq kg-1。发现平均外部地面伽马剂量率为 85.12 nGy h-1。计算出的外部危害值为 0.49,在小于 1 的可接受限度内(Hex ≤ 1)。Thermo Scientific RadEye NBR 检测器用于确定环境伽马剂量率。伽马剂量率是在距地表 1 m 高度的 445 个点测量的。平均室外伽马剂量率(范围)为 150.13 (50–480) nGy h-1。发现该平均值高于世界平均值。内夫谢希尔省的大部分地区以火山岩为基础,这一事实解释了伽马剂量率高的原因。伽马剂量率是在距地表 1 m 高度的 445 个点测量的。平均室外伽马剂量率(范围)为 150.13 (50–480) nGy h-1。发现该平均值高于世界平均值。内夫谢希尔省的大部分地区以火山岩为基础,这一事实解释了伽马剂量率高的原因。伽马剂量率是在距地表 1 m 高度的 445 个点测量的。平均室外伽马剂量率(范围)为 150.13 (50–480) nGy h-1。发现该平均值高于世界平均值。内夫谢希尔省的大部分地区以火山岩为基础,这一事实解释了伽马剂量率高的原因。
更新日期:2020-11-26
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