A deuterium plasma experiment is being planned at the Large Helical Device (LHD) at the National Institute for Fusion Sciences (NIFS). To delineate the regional background tritium concentration level before initiation of the experiment, we evaluated tritium concentrations in environmental water samples (river water, pond water, well water, tap water, and rainwater) collected at Tono area, Japan since 1982. Tritium concentrations in environmental water samples ranged widely from N.D. (below the instrumental detection limit of 0.27 Bq L?1) to a maximum of 4.39 Bq L?1. Tritium concentrations at 9 continuous monitoring locations over the 15 years ranged from N.D. to 1.36 Bq L?1. This regional background concentration range will be used to evaluate environmental assessments after the initiation of the deuterium plasma experiment in LHD.
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机译：美国国家融合科学研究院（NIFS）的大型螺旋装置（LHD）计划进行氘等离子体实验。为了描述实验开始前的区域本底background浓度水平，我们评估了自1982年以来在日本Tono地区收集的环境水样品（河流水，池塘水，井水，自来水和雨水）中的concentrations浓度。环境水样的范围很广，从ND（低于仪器检测限0.27 Bq L ？1 ）到最大4.39 Bq L ？1 。在过去的15年中，连续9个监测点的concentrations浓度范围为N.D.至1.36 Bq L ？1 。在LHD中进行氘等离子体实验后，该区域背景浓度范围将用于评估环境评估。
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