Open AccessRadioactivity level of coastal sediments and water across the Sangihe Island as the outlying islands of Indonesia
Author(s) -
Mohamad Nur Yahya,
Untara,
Murdahayu Makmur,
Wahyu Retno Prihatiningsih,
D I P Putra,
Y Priasetyono
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/890/1/012008
Subject(s) - environmental science , radionuclide , natural radioactivity , seawater , sediment , effective dose (radiation) , environmental chemistry , oceanography , physical geography , hydrology (agriculture) , geography , chemistry , geology , physics , nuclear medicine , medicine , paleontology , quantum mechanics , geotechnical engineering
Indonesia as an archipelagic country is very concerned about maritime development, the outlying islands are the entrance for potential threats of radioactive distribution from global waters. Furthermore, the outlying islands have functions such as territorial defence, security, and sovereignty, economic and ecological. As environmental protection, level of natural and anthropogenic radioactivity was performed due to potential threats. The activity concentration of natural ( 226 Ra, 232 Th, and 40 K) radionuclides inshore sediments samples are range from 3.44 ± 0.01 Bq kg −1 , 5.13 ± 0.03 Bq kg −1 and 151.42 ± 0.04 Bq kg −1 respectively and average concentration level of anthropogenic of 137 Cs in sediment and seawater obtained were 0.35 Bq kg −1 and 0.83 Bq m 3 respectively. The concentrations value of NORM was lower compare to another region but the ratio sequence 226 Ra< 232 Th< 40 K relatively have same pattern. The presence of fission product 137 Cs in this region comes from global fallout since no nuclear activities in Indonesia and the level of 137 Cs are almost same as the estimation the concentration 137 Cs in the Pacific Ocean and comparable with other studies. Radioactivity levels in all samples are under the value of radiological hazard index (0.004-0.039, trace hold h-index=1) and annual effective dose rate are in save level (0.01 mSv/y, recommended limit AED=1mSv/year). The level of NORM radioactivity is locally and varied for each region meanwhile anthropogenic radioactivity are global and comparable since there are no nuclear activity in Indonesia.