No abstract

In this report, the radiological survey of radioactivity measurements in soil and onion and their mobility is carried out which is very important in the environment and several scientific fields. The measurements about the concentrations of activity in soil, leaves and bulbs for onion in the location of Johor and Perak, Malaysia have been carried out using neutron activation analysis (NAA) of TRIGA MARK II research reactor facilities at Nuclear Agency, Bangi, Malaysia. The transfer factors (TFs) of 238U, 232Th and 40K from 6 different natural background soils are studied from soil to onion under natural field conditions. The TFs for onion leaves and bulb are in the range of (6.01-79.2) x 10-3, (1.21-61.4) x 10-3, (1.012-4.265) x 10-1 and 0.028-0.334, 0.017-0.293 and (0.908 -3.685) x10-1for 238U, 232Th, and 40K respectively. There exists a linearity correlation between the dose rate as well as activity concentration of the soils. The observed transfer factor of onion bulbs was usually higher than in leaves.

This paper has explained the contamination of natural radionuclides in various water testers using gamma ray measurement which is very significant as part of health scrutiny programs to progress the ecological knowledge. Natural radioactivity was determined in five groups of water samples (rain, mine, tap, drinking and mineral) from different places at Johor, Malaysia by means of gamma-ray spectrometry tool. The annual cumulative effective doses were estimated 6.05 mSv /yr for rain, 9.49 mSv/ yr for mine, 6.39 mSv /yr for tap, 5.67 mSv /yr for drinking, and 6.01 mSv/yr for mineral water. Among the five samples, mine water gave the highest value in annual effective dose measurement. The measured data are compared with the reported value. The activity concentrations of five water samples provided that bottled drinking water was the lowest than other water samples. This research is useful to provide some information to the public about the amount of radionuclide content uranium, thorium and potassium that present in water.