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CD as a dosimeter

08.04.2004

Bulgarian physicists from the University of Kliment Ohridski in Sofia have found that the CDs stored in almost every home can tell what kind of radiation load the inhabitants of the house received.

Alpha particles emitted by radon, the most common source of natural radiation in residential buildings built in the mountainous regions of Bulgaria, leave traces in the polycarbonate base of the disc. By etching the plastic with acid, these traces can be enlarged so that they become visible under an optical microscope.

Knowing when the disk was purchased and what the average temperature in the house has been over the past years, the number of footprints per square centimeter can be used to estimate the radiation dose with an accuracy of 10 percent.

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