Evaluation and assessment of 7 years of radioactivity monitoring data for Th232, Ra226, K40 on surface soil and the impact of the construction of mass rapid transit stations around pasar jumat nuclear area

Abstract

Evaluation and assessment of 232Th, 226Ra, and 40K as natural radioactivity in surface soil in Pasar Jumat Nuclear Facility (PJNA) are important and are a routine activity to monitor the impact of human activities on changes in the level of natural radioactivity in soils. The monitoring data over 7 years period (2012 – 2018) was evaluated to show the time trends, the ratio concentration, and correlation between the outside of PJNA of natural radioactivity level on surface soils. The average radioactivity trend over 7 years monitoring of 232Th, 226Ra, and 40K concentration have varied data. While the mean ratio of 40K/232Th is range from 0.732 to 2.178. The average level of radioactivity concentration at surface soil during the pre-construction, construction, and operation of the MRT project for 232Th, 226Ra, and 40K are 23.34, 21.64, 21.56 bq/kg, then 19.30, 16.73, 18.93 bq/kg, and 27.47, 26.05, 22.26 bq/kg, respectively. The evaluation result state during the MRT project that only the concentration of 232Th on before construction period has a significantly different the mean. There was no influence of MRT construction on surface soil concentration.