A novel envelope-type radon monitor has been used for short-term (as little as 1 week) radon concentration measurements in a workplace environment. The commercially available LR-115 type II damage track detector was used in this study and the chemically etched sheets were spark counted. The measure ments were made over a period of 1 year in a workplace consisting of three adjacent rooms situated in the lower ground level of a multistorey office build ing in Rome, Italy. The variations of the radon concentration are from ∼ 20 to ∼ 300 Bq m-3 with averages of 130, 81 and 73 Bq m-3 for the three different rooms resulting in annual doses of ∼ 3.8, ∼ 2.4 and ∼ 2.2 mSv, respectively.
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