Online ISSN: 1884-4111 Print ISSN: 0033-8303
Radioisotopes 65(11): 431-439 (2016)


富士山南西麓における地下水の222Rn濃度分布Distribution of Radon Concentration in Groundwater at the Southwestern Foot of Mt. Fuji

産業技術総合研究所地質調査総合センターGeological Survey of Japan, National Institute of Advanced Industrial Science and Technology ◇ 305–8567 茨城県つくば市東1–1–1 中央第7 ◇ AIST Tsukuba Central 7, 1–1–1 Higashi, Tsukuba, Ibaraki Pref. 305–8567, Japan

受付日:2016年2月24日Received: February 24, 2016
受理日:2016年8月10日Accepted: August 10, 2016
発行日:2016年11月15日Published: November 15, 2016


222Rn concentration in groundwater was investigated around the southwestern foot of Mt. Fuji. The results showed that 222Rn concentrations in water samples of the coastal area were higher than those of the inland area and its distribution seemed not to be correlated with the distribution of fault in the study area. In addition, most of the water samples with high 222Rn concentration showed relatively high strontium isotope ratio (87Sr/86Sr) indicating the influence of sand and gravel layer in alluvial fan. Consequently, the main factor for the increase of 222Rn concentration in groundwater at the coastal area was estimated the radioactive decay from 226Ra which is concentrated in the alluvial fan deposit.

Key words: radon; strontium; groundwater; Mt. Fuji

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