A Nationwide Survey of 222Rn and Gamma Radiation Levels in Australian Homes

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Abstract
A nationwide survey of Australian homes was conducted to determine the average annual dose equivalents to the Australian population from exposure to Rn and gamma radiation. The exposure to Rn was measured using solid-state track detectors (SSTD), while the gamma radiation dose was concurrently determined using thermoluminescent dosimetry. Dosimeters were placed in approximately 3,400 randomly distributed homes (representing about 1 in 1,400 occupied dwellings) for 12 mo. The average Rn concentration in Australian homes measured over a year is 11 Bq m−3. Using appropriate conversion factors, the annual average effective dose equivalents to the Australian population were determined to be 0.5 mSv and 0.9 mSv for Rn and gamma radiation exposure, respectively.

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