NIST 222Rn emission standards
Copyright policy )NIST 222Rn emission standards
NIST radon standards are hermetically sealed polyethylene capsules filled with 226Ra solution. Recently, four new series of standards with activities 5, 50, 500, and 5000 Bq were prepared. The measured emanation fraction agrees with a calculation that accounts for the radon accumulated inside the polyethylene walls of the capsule. Obtained solubility of radon in polyethylene is approximately 45 of the solubility of radon in water. The radon diffusion coefficient in low-density polyethylene is 7.2x10(-8)cm2/s.
- National Institute of Standards and Technology United States
Radiation Monitoring, Radon, Reference Values, International Cooperation, Reproducibility of Results, Reference Standards, Radiation Dosage, Sensitivity and Specificity
Radiation Monitoring, Radon, Reference Values, International Cooperation, Reproducibility of Results, Reference Standards, Radiation Dosage, Sensitivity and Specificity
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