The practical use of electrets in a public health radon remediation campaign

Denman, A.R., Groves-Kirkby, C.J., Phillips, P.S., Crockett, R.G.M., Woolridge, A. and Gillmore, G.K. (2005) The practical use of electrets in a public health radon remediation campaign. Journal of Environmental Radioactivity, 84(3), pp. 375-391. ISSN (print) 0265-931X


As part of a long-term assessment of domestic radon in Northamptonshire, England, a batch of 50 commercially available electrets was deployed for nearly 1000 exposures, individual exposure periods ranging from one to eight weeks. Responsivity was comparable with that of recently-calibrated Durridge RAD-7 continuously-monitoring equipment. Voltage history analysis indicated mean voltage decay during manufacturers' QA assessment of 0.059 ± 0.026 V day−1, increasing to 0.114 ± 0.073 V day−1 during storage to first use and to 0.204 ± 0.49 V day−1 during inter-deployment storage. At a representative elevated radon concentration of 500 Bq m−3, the resulting perturbation is 3% over a 7-day deployment; at the typical mean Northamptonshire level of 80 Bq m−3 it approaches 22%. Each electret can be used for up to 25 measurements, which makes the technology attractive for organisational use. It is not suited for deployment by individual householders.

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