Radon: post‐remediation studies in National Health Service properties

An extensive radon remediation programme in National Health Service properties in Northamptonshire has been conducted since 1992 and has resulted in many buildings with raised levels being identified and remediated. In the autumn of 1997, several of the remediated properties were surveyed in order to determine the viability of the remedial measures and the dose reduction to staff. The initial assumption that reduction factors in radon levels would be greater than reduction factors in radiation dose per person was partially confirmed. This was due to the part‐time working patterns of staff and their mobility during working hours.