Determination of thorium concentrations in soil and sand samples using instrumental neutron activation analysis

被引:10
作者
Mishra, D. G. [1 ]
Acharya, R. [2 ]
Swain, K. K. [3 ]
Joshi, R. M. [1 ]
Joshi, V. M. [1 ]
Verma, P. C. [1 ]
Hegde, A. G. [1 ]
Reddy, A. V. R. [3 ]
机构
[1] Bhabha Atom Res Ctr, Div Hlth Phys, Bombay 400085, Maharashtra, India
[2] Bhabha Atom Res Ctr, Div Radiochem, Bombay 400085, Maharashtra, India
[3] Bhabha Atom Res Ctr, Div Analyt Chem, Bombay 400085, Maharashtra, India
关键词
Instrumental neutron activation analysis; Thorium; Soil; Sand; Reactor neutron irradiation; Gamma-ray spectrometry; ICP-MS; URANIUM; RADIONUCLIDES; SEPARATION; MATRICES; TH-232;
D O I
10.1007/s10967-012-1781-3
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Thorium along with its daughter products present in the soil is one of the major contributors to the external gamma dose in the environment. To establish the dose levels, quantification of thorium contents in soil samples is very important. As a part of pre-operational environmental radiological surveillance, a total of 23 soil and six sand samples were collected from different locations around the proposed nuclear power plant site of Jaitapur, Maharashtra. Thorium concentrations in these samples were determined by instrumental neutron activation analysis (INAA). Samples were irradiated with neutrons in Apsara reactor at a neutron flux of similar to 5 x 10(11) cm(-2) s(-1) and radioactive assay was carried out using high resolution gamma ray spectrometry. Relative method of INAA was used for quantification of thorium utilizing 311.9 keV gamma ray of Pa-233, the daughter product of Th-233. The concentrations of thorium in the soil and sand samples were in the ranges of 4.0-18.8 and 1.2-6.2 mg kg(-1) respectively.
引用
收藏
页码:333 / 336
页数:4
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