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Thorium content in zircon sand, thorium ore and a thorium liquid sample (EU Laboratories Network Intercomparison), as well as in some Romanian building materials: sand, wood, tufa, asbestos-cement. cement mill dust, coal fly ash, bricks, and tile (28 samples) was deterimined by gamma ray spectrometry. For the building materials, 226Ra, 40K and 137Cs specific activities were also measured. The results were compared with the Romanian legal norms concerning the highest admissible levels for 232Th, 226Ra. and 40K radioactivity. and to Th, U, and K concentration values previously determined in our laboratory on similar types of samples.

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The concentrations of 137Cs were determined by in 11 sediment samples, collected along the Romanian sector of the Danube river and the Black Sea coast during 1994 7-ray spectrometry. The concentrations of 9~ in the same sediment samples were determined by [3-counting of the 90y oxalate, precipitated after strontium separation using a strontium extraction chromatography column. The concentration distributions of 137Cs and 9~ are compared with the 238pu and 239'240pu concentration distributions in the same samples, reported in a previous paper. The accumulation potential of 137Cs, 9~ and plutonium isotopes in the river and sea sediments analysed is discussed.