ASSESSMENT OF GROUNDWATER RADON CONCENTRATIONS IN KELANTAN, MALAYSIA
This study aimed to assess radon concentration in groundwater and the associated dose receives by people in Kelantan, Malaysia. The measurements were carried out by means of continuous radon/thoron monitor model RTM1688-2 involving 8 dug wells and 21 boreholes in 6 districts. Generally, groundwater samples contained low radon concentrations. The range of measured radon concentrations was 0.05 – 22.63 Bq/L with the mean value of 5.1 Bq/L. This mean value was 50% lower than UNSCEAR (2000) average of 10 Bq/L and far less than WHO (2011) reference level of 100 Bq/L. Radon concentrations vary with location, well depth and season. The calculated annual effective dose was 9 µSv. Radon in groundwater poses no significant radiological hazard to the people in the state.