| Summary: | Of late, environmental pollution caused by outdoor 222Rn emanation rate from soil has become one of the main concerns of many researchers. This research focuses on the 222Rn emanation rate of Naturally Occurring Radioactive Materials (NORM) in the soil from the Tasik Paya Bungor area, Malaysia, which is one of the oldest tropical rainforest in the world. This area has been transformed into a plantation area by the locals. With the increment of agricultural activities in the area which involve the use of phosphate fertilisers and pesticides, the radiation contamination due to 222Rn emanation rate from the soil has also increased. To investigate the 222Rn emanation rate from the soil, samples from 14 different points on selected locations were collected using a hand auger, based on a standard sampling method. Both methods in determining the 222Rn emanation rate for long-term measurement using CR-39 and 222Rn exhalation rate using diurnal measurement by Sun Nuclear Continuous Radon Monitor, CRM-1029 in Air-Tight Chamber were used. From the results, the average 222Rn emanation rate obtained using CR-39 is 0.51±0.05 Bq m-3day-1. As for the diurnal measurement using CRM-1029, the 222Rn mass exhalation rate reading ranges between 0.11 – 0.72 mBq kg-1hr-1and the 222Rn surface exhalation rate between 0.31 - 2.0 Bq m-2hr-1. It shows that both methods may be used, depending on the accessibility. The values are considered low as compared to the allowed national limit. However, in the future, more points on the selected locations should be considered for radon emanation rate measurement and its natural radionuclides concentration should also be determined. © **. All Rights Reserved.
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