%0 Journal Article
%T Activity Concentration of 238U, 232Th and 40K Based on Soil Types in Perak State, Malaysia
%A Nursama Heru Apriantoro
%A Ahmad Termizi Ramli
%A Sutisna Sutisna
%J Earth Science Research
%D 2012
%I 
%R 10.5539/esr.v2n2p122
%X The activity concentrations of 238U, 232Th and 40K in soil samples from different soil types has been collected in the state of Perak, Malaysia. The samples were determined using a high resolution co-axial HPGe gamma ray spectrometry system. Mean values for 238U, 232Th and 40K activity concentrations were found to be (127 ¡À 97) Bq kg-1, (304 ¡À 28) Bq kg-1, and (302 ¡À 29) Bq kg-1 respectively. The highest concentration of 238U and 232Th was found for soil of the types Paleudults-Hapludults and 40K for the typic Aeric Tropaquepts. The external hazard values (Hex) are between 0.35 and 3.07. Soil type typic Paleudults and typic Hapludults have a hazard index, Hex value which is greater than 2, and the rest of the soil types (ten soil types) have Hex values between 1 to 2. The concentrations of 238U and 232Th in soil samples in the study area are higher than the reference value.
%U http://www.ccsenet.org/journal/index.php/esr/article/view/25262