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The radioactivity concentrations of natural radionuclides 232 Th, 40 K, 238 U, have been determined for various mushroom samples collected from black sea region in Ordu and Kastomonu provinces of Turkey. NaI (Tl) γ-scintillation counter is used for radioisotope concentration measurements. The radionuclide activity concentrations of 232 Th, 40 K, 238 U in the mushroom species were found to be ranging from 0.354 to 5.43, 4.37 to 90.9, 1.03 to 8.45 Bq/kg, respectively. Annual effective doses for ingestion of edible mushrooms were calculated and it is shown that exposure is mainly due to 232 Th natural radionuclides. The mean annual effective dose due to the intake of mushrooms was found to be 1.13 × 10-04 mSv.

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Seasonally gross alpha–beta activities were measured in surface water and sediments in Sır Dam Pond (Kahramanmaras, Turkey). Six sampling sites were pre-defined in different locations of the Sır Dam Pond. Preliminary studies of gross-α and gross-β activities in the surface water and deep sediments were determined. The results obtained from the determination of the activity indicate that gross-α and gross-β activities were ranging from 0,007 ± 0,005 to 0,077 ± 0,006 Bq/l and from 0,028 ± 0,006 to 0,189 ± 0,009 Bq/l for the surface water and from 0,001 ± 0.001 to 0,229 ± 0,032 Bq/g and from 0,144 ± 0,026 to 0,419 ± 0,033 Bq/g for deep sediment, respectively.