Le Tan Van, Inoue Kazumasa, Tsuruoka Hiroshi, Fujisawa Makoto, Arai Moeko, Nguyen Linh Dai Hung, Somboon Siriprapa, Fukushi Masahiro
Department of Radiological Sciences, Graduate School of Human Health Sciences, Tokyo Metropolitan University, 7-2-10 Higashiogu, Arakawa-ku, Tokyo 116-8551, Japan.
Department of Radiological Sciences, Tsukuba International University, 6-20-1 Manabe, Tsuchiura, Ibaraki 300-0051, Japan.
Radiat Prot Dosimetry. 2018 Apr 1;179(1):18-25. doi: 10.1093/rpd/ncx185.
Absorbed dose rates in air from natural radionuclides were measured by a car-borne survey in southern Vietnam. The mean absorbed dose rate in air for southern Vietnam, which consists of the south-east region and the Mekong River Delta region, was 64 ± 18 nGy h-1, while rates for the two regions were 61 ± 17 and 66 ± 19 nGy h-1, respectively. These dose rates were respectively 1.2, 2.1 and 0.9 times the measured values that were calculated on the basis of activity concentrations of soil samples in a previous study. It was considered that measured dose rate in the south-east region was influenced by the presence of artificial structures such as high-rise buildings and roads. The effective dose due to terrestrial gamma radiation for southern Vietnam was calculated to be 0.55 mSv y-1 which is 1.2 times higher than the world-wide average of 0.48 mSv y-1.
在越南南部通过车载调查测量了天然放射性核素在空气中的吸收剂量率。越南南部由东南部地区和湄公河三角洲地区组成，空气中的平均吸收剂量率为64±18纳戈瑞每小时，而这两个地区的剂量率分别为61±17和66±19纳戈瑞每小时。这些剂量率分别是根据先前一项研究中土壤样品的活度浓度计算出的测量值的1.2倍、2.1倍和0.9倍。据认为，东南部地区的测量剂量率受到高层建筑和道路等人造结构的影响。越南南部陆地伽马辐射所致的有效剂量经计算为0.55毫希沃特每年，比全球平均水平0.48毫希沃特每年高出1.2倍。
