Distribution of natural radioactivity in rocks from Ikogosi-Ekiti, Southwestern Nigeria and its radiological implications

被引：12

作者：

Ajayi, OS ^{[1
]}

机构：

[1] Fed Univ Technol, Dept Phys, Akure, Ondo State, Nigeria

来源：

HEALTH PHYSICS | 2000年 / 79卷 / 02期

关键词：

naturally occurring radionuclides; geology; spectroscopy; gamma; dose; absorbed;

D O I：

10.1097/00004032-200008000-00013

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The natural radioactivity in some rock samples in Ikogosi-Ekiti, Southwestern Nigeria, has been measured using a very sensitive gamma spectroscopic system consisting of a 76 mm x 76 mm NaI(TI) scintillation detector system coupled to a versatile Canberra Series 10 plus multichannel analyzer. The average concentrations of natural radioisotopes U-238, Th-232, and K-40 are 57.9 +/- 28.1 Bq kg(-1), 81.6 +/- 23.8 Bq kg(-1) and 1203.1 +/- 687.2 Bq kg(-1), respectively, These average values give rise to a mean absorbed dose rate of 0.128 +/- 0.051 mu Gy h(-1) at a height of 1.0 m and an effective dose equivalent of 156.90 mu Sv y(-1). The results indicate no radiological anomaly. The data presented here will serve as a baseline survey for primordial radionuclide concentrations in rocks of the area.

引用

页码：192 / 195

页数：4