DefinePK

Abstract

A study of natural radioactivity in samples of groundwater and soil were collected from nine districts in Johor and it was carried out on years 2008 until years 2010. The totals of seventy locations were selected as sampling point by referred to the reconnaissance maps and have been considered to the certain factor such as groundwater sources, soil types and the surrounding activities such as industrial or agricultures. At sampling point, the portable gamma-ray survey meter, Model 19 Micro R meter manufactured by Ludlum is used to measure the gamma dose rate at the surrounding areas. In the laboratory, the sample preparation process is made according to the recommended steps and the preparation process of groundwater and soil are different from each other. The technology of HPGe spectrometer is used to counting all samples within 3 hours detection time and the collections of data on radionuclide is in the form of gamma spectrum. Further analysis is depends on the measurement of the natural radioactivity of the elements 238U, 232Th and 40K in order to get the estimation results of the concentration radionuclide contained in groundwater and soil samples. At last, the graphs were plotted for the relationship between the concentration of radionuclide in the samples and gamma dose. At last, graphs were plotted for the relationship between the concentration of radionuclide in the samples and gamma dose.