Main Article Content
This study investigates radioactivity in the ambient air for a district in Hanoi capital, Vietnam, in the period 2015 - 2018. Aerosol samples are collected by Taifful (Тайфун, Russia) equipment, using ΦПП 15-3p filter, to determine the 40K, 238U, and 232Th concentration by gamma spectrometry method and following the STI/DOC 010/295 TRS 295-IAEA-1989 guidelines. While the Radon concentration level is directly determined by the Pylon portable radiation monitors (model AB-5R). Results show that the 40K isotopes, 238U, 232Th, and Radon concentration levels are 40.43 ± 8.88 µBq.m-3, 4.39 ± 0.47 µBq.m-3, 2.01 ± 0.13 µBq.m-3, and 20.63 ± 1.06 Bq.m-3 respectively. The total annual effective dose for people of different age groups caused by radioactive isotopes ranges from 0.73 mSv.year-1 to 0.84 mSv.year-1. Those levels are lower than the current national standards and regulations of many cities in the world. The study can be used as an initial reference for the recommendation of regulation development for Vietnam in near future.
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