![Systematics of radon at the Wairakei geothermal region, New Zealand [An article from: Journal of Environmental Radioactivity]](https://www.ebooknetworking.net/books/noimage.jpg)
Systematics of radon at the Wairakei geothermal region, New Zealand [An article from: Journal of Environmental Radioactivity]
Description
This digital document is a journal article from Journal of Environmental Radioactivity, published by Elsevier in 2007. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
^2^2^2Rn and ^2^2^0Rn in geothermal steam at Wairakei, NZ, range from 11 to 19@?500Bqkg^-^1, and 25 to 16@?700Bqkg^-^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. ^2^1^0Po 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. ^2^2^0Rn concentrations at Wairakei should decrease as the field becomes steam-dominated. Rock surfaces were variably leached or enriched with U, Th, Ra and ^2^1^0Pb, providing a possible model for deposition in cooler regions near the field. Estimates of ^2^2^2Rn permeability ranged from 2 to 77% of the maximum possible, with a median of 13%.
Description:
^2^2^2Rn and ^2^2^0Rn in geothermal steam at Wairakei, NZ, range from 11 to 19@?500Bqkg^-^1, and 25 to 16@?700Bqkg^-^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. ^2^1^0Po 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. ^2^2^0Rn concentrations at Wairakei should decrease as the field becomes steam-dominated. Rock surfaces were variably leached or enriched with U, Th, Ra and ^2^1^0Pb, providing a possible model for deposition in cooler regions near the field. Estimates of ^2^2^2Rn permeability ranged from 2 to 77% of the maximum possible, with a median of 13%.
