کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1739247 1016840 2007 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Systematics of radon at the Wairakei geothermal region, New Zealand
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی هسته ای و مهندسی
پیش نمایش صفحه اول مقاله
Systematics of radon at the Wairakei geothermal region, New Zealand
چکیده انگلیسی

222Rn and 220Rn in geothermal steam at Wairakei, NZ, range from 11 to 19 500 Bq kg−1, and 25 to 16 700 Bq kg−1, respectively, but do not cause toxic concentrations in air. The wide ranges are mainly due to differences in different physical conditions underground (e.g. thin silica diffusion barriers), not geochemical differences. Groundwater Rn from outside the area probably plays only a minor role. 210Po was found present in non-toxic levels in the steam. Historical records showed little change in Rn concentration over several decades, therefore potentially hazardous concentrations might be predicted from early exploration. 220Rn concentrations at Wairakei should decrease as the field becomes steam-dominated. Rock surfaces were variably leached or enriched with U, Th, Ra and 210Pb, providing a possible model for deposition in cooler regions near the field. Estimates of 222Rn permeability ranged from 2 to 77% of the maximum possible, with a median of 13%.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Environmental Radioactivity - Volume 92, Issue 1, 2007, Pages 16–29
نویسندگان
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