Retrospective radon progeny measurements for dwellings based on implanted 210Po210Po activities in glass objects

In the present work, we used the (CR–LR) difference technique for retrospective radon progeny measurements in 17 dwellings based on implanted 210Po activities in glass objects. A total of 48 glass objects were examined, but only 19 objects gave results which were sufficiently reliable due to the sensitivity of the method. From these 19 data, an increase in the surface 210Po activities in the glass objects with the age of the glass objects was noticeable as expected. The surface activities of 210Po in the glass objects were then converted to the potential alpha energy concentration (PAEC) through a calibration curve. It was found that the PAEC for dwelling sites did not change significantly with the building age.