Radiation dose assessment at amang processing .
Measurements of external radiation level, radon/thoron daughters concentrations in air and uranium/thorium concentrations in airborne mineral dust at 16 amang plants in Malaysia were carried out for three consecutive months to assess radiation dose to workers. Estimated occupational dose was within the range of 1.710.9 mSv y1. The mean total dose at the amang plants was 4.1 mSv y1. .