The Implications of the Proposed Changes in Radon Dosimetry to the Uranium Industry

In 2009, the International Commission on Radiological Protection published a statement on radon stating some significant departures from the approach currently in existence. The changes related to the most recent results of epidemiological studies which suggested a higher risk per unit exposure and also a move to the use of dosimetric rather than epidemiological approach to the calculation of dose conversion factors. For the uranium industry, the changes in radon dosimetry could be very important to the viability of some uranium operations and in particularly operations with a higher potential for radon exposure such as underground operations. Under the World Nuclear Association banner, a number of uranium mining companies formed a working group to examine the implications of the proposed changes and also the practical approaches required to ensure a high standard for occupational radiation protection. These studies included examining the existing radon and radon decay product doses, the characterisation of the physical properties of the radon decay products, and also the effectiveness of corrective measures such as increased ventilation, the use of purification of supplied air and the effectiveness of protective equipment. The overall aim of the uranium industry is to remain at the forward edge of the science of radiation protection to ensure the safety and protection of the workforce in a practical and appropriate manner. (author)