Analysis on Natural Background Radiation Dose Rate in Mamuju, West Sulawesi Frafti Rejeki S(a*), Sidik Permana(a,b*), Adi Rahmansyah(b), Haryo Seno(c), Zulfahmi(a), Ismail Humolungo(b)
a) Physics Department, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia
*fraftirejeki[at]gmail.com, psidik[at]itb.ac.id
b) Nuclear Science and Engineering Department, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia
c) Indonesia^s National Research and Inovation Agency, Jalan Tamansari 71, Bandung 40132, Indonesia
Abstract
Measurement of natural radiation dose rates has been carried out in Mamuju Regency, West Sulawesi. The research was conducted to determine the dose rate of natural radiation, to compare the radiation dose rates at the research location with several other regions in Indonesia and the world, as well as to map the distribution of natural radiation dose rate. Measurement of the natural radiation dose rate above the ground level (ambient dose ) is carried out using a scintillator detector NaI(Tl) Inspector 1000 Canberra and Geiger Muller mini Radiac Canberra which can directly measure the radiation dose rates in the field. The research locations covered 5 sub-districts in Mamuju Regency where there were 75 measurement points whose coordinate positions were recorded using the GPX Garmin Etrex 10. The measurement technique was carried out using a grid system measuring 2 x 2 km2. Measurements were made at a distance of one meter above the ground and right above the ground surface. The measurement results show that there is a significant difference in the values of the two detectors used. The average natural radiation dose rate obtained from measurements using a NaI(Tl) scintillator detector is 0.21 μ-Sv/hour which is lower than Geiger Muller that show 0.78 μ-Sv/hour. The average annual effective dose value received by the population is around 0.37 mSv/year which is lower than the international standard set by UNSCEAR. The average annual radiation dose rate in Mamuju district is the highest in Indonesia.
