The 14C age of groundwater around saltwater-freshwater interface in deep coastal aquifer

Isao Machida1, Masahiko Ono1, Reo Ikawa1, Masaru Koshigai2 and Atsunao Marui1, (1)Geological Survey of Japan, Institute for Georesources and Environment, Tsukuba, Japan, (2)SUNCHO CONSULTANTS Co. Ltd, Tokyo, Japan