1. Durridge Co., RAD7 detector user Manual, (2009)
2. Durridge Co., RAD7 RAD H2O Radon in Water accessory owner’s Manual, (2009)
3. Exhalation of 222Rn from Porous Materials
4. World Health Organization (WHO), Guidelines for drinking water quality, Printed in China by Sun Fung, 3rd edition, vol. 1 (2004).
5. World Health Organization (WHO), Guidelines for drinking water quality (2011).