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Nugraha, E. D.*; Hosoda, Masahiro*; Kusdiana*; Untara*; Mellawati, J.*; Nurokhim*; Tamakuma, Yuki*; Ikram, A.*; Syaifudin, M.*; Yamada, Ryohei; et al.
Scientific Reports (Internet), 11(1), p.14578_1 - 14578_16, 2021/07
Times Cited Count：19 Percentile：83.39(Multidisciplinary Sciences)Mamuju is one of the regions in Indonesia which retains natural conditions but has relatively high exposure to natural radiation. The goals of the present study were to characterize exposure of the entire Mamuju region as a high natural background radiation area (HNBRA) and to assess the existing exposure as a means for radiation protection of the public and the environment. A cross-sectional study method was used with cluster sampling areas by measuring all parameters that contribute to external and internal radiation exposures. It was determined that Mamuju was a unique HNBRA with the annual effective dose between 17 and 115 mSv, with an average of 32 mSv. The lifetime cumulative dose calculation suggested that Mamuju residents could receive as much as 2.2 Sv on average which is much higher than the average dose of atomic bomb survivors for which risks of cancer and non-cancer diseases are demonstrated. The study results are new scientific data allowing better understanding of health effects related to chronic low-dose-rate radiation exposure and they can be used as the main input in a future epidemiology study.
collected around the Fukushima Dai-ichi Nuclear Power PlantDohi, Terumi; Omura, Yoshihito*; Fujiwara, Kenso; Kikuchi, Naoyuki; Iijima, Kazuki
no journal, ,
A plenty of various radionuclides was released into the atmosphere by the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident. The local radioactive contaminations (i.e. radioactive plume's trajectory) around the FDNPP were caused by the releasing radionuclides from each reactor, meteorological and geographical conditions, etc. In order to clarify the contamination characteristics of the plume's trajectory, we focused on lichen samples that are well known organism to retain radionuclides for a long period. A field investigation was carried out around the FDNPP on January 2016. , a common species at the area, growing on trunks of trees was collected around the FDNPP. The fragments of lichen thalli were analyzed by the scanning electron microscope coupled with energy dispersive X-ray spectrometer (SEM-EDS). Heavy metal particles were detected on the surface of
. They might originate from reactors of the FDNPP because they contain anthropogenic elements such as, (Fe, Zn), (Cd, Zn), (Zr, Ti), (Fe, Zn, Cr), (Ti, Fe, Ce), (Fe, Ti, Cr, Ni), (Fe, Cr, Zn, Cd), etc. Further data of the elemental composition in particles on lichen samples would be helpful to discuss the differences among the radioactive plume's trajectories from each reactor.
