Bala Sundar S, Chitra N, Vijayalakshmi I, Danalakshmi B, Chandrasekaran S, Jose M T, Venkatraman B
Radiological Safety Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India
Radiological Safety Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India.
Radiat Prot Dosimetry. 2015 Jun;164(4):569-74. doi: 10.1093/rpd/ncv313. Epub 2015 May 13.
The objective of this study is to compute the primordial radionuclides activity in soil samples and estimate the radon/thoron exhalation rates. A total of 25 locations were chosen for the study at Kalpakkam. Ambient radiation levels were monitored prior to collection of samples, which were subjected to gamma spectrometry. While (238)U concentration was found to be below detectable limit, the activities of (232)Th and (40)K were varying from 34.53 to 1093.11 Bq kg(-1) and 36.6 to 570.08 Bq kg(-1), respectively. The radium equivalent activities (Raeq) were in the range of 83-1574 Bq kg(-1). There was no appreciable radon exhalation, and the thoron surface exhalation rate varied from 942 to 7720 Bq m(-2) h(-1). The annual effective dose was ranging from 0.05 to 0.81 mSv y(-1). Good correlation was observed between (232)Th content and thoron exhalation rate. The details of the study are presented in this article.
本研究的目的是计算土壤样品中原始放射性核素的活度，并估算氡/钍的析出率。在卡尔帕卡姆共选取了25个地点进行研究。在采集样品之前监测了环境辐射水平，样品随后进行了伽马能谱分析。虽然发现（238）U浓度低于可检测限，但（232）Th和（40）K的活度分别在34.53至1093.11 Bq kg（-1）和36.6至570.08 Bq kg（-1）之间变化。镭当量活度（Raeq）在83 - 1574 Bq kg（-1）范围内。没有明显的氡析出，钍表面析出率在942至7720 Bq m（-2）h（-1）之间变化。年有效剂量在0.05至0.81 mSv y（-1）范围内。观察到（232）Th含量与钍析出率之间有良好的相关性。本文介绍了该研究的详细情况。
