1. National Council on Radiation Protection and Measurements Measurement of Radon and Radon Daughters in Air 97, ISBN 0-913392-97-9 Bethesda, MD 1988
2. State-of-the-Art Instruments for Measuring Radon/thoron and Their Progeny in Dwellings-A Review
3. Improved Low‐Level Alpha‐Scintillation Counter for Radon