  Measurements of I-131 (T1/2 = 8.04 days) have been performed in IFIN-HH's
underground laboratory situated in Unirea salt mine from Slanic-Prahova,
Romania. The rain water samples were collected in March 27th in Brasov and in
March 27th, 29th and April 2nd in Slanic. Also sheep milk was collected in
Slanic area and subsequently measured. The samples were measured in the
IFIN-HH's underground laboratory in ultra-low radiation background, using a
high resolution gamma-ray spectrometer equipped with a GeHP detector having a
FWHM = 1.80 keV at 1332.48 keV at the second Co-60 gamma-ray, and a relative
efficiency of 22.8%. The results show a specific activity of I-131 from 0.17 to
0.87 Bq/dm^3. In the sheep milk from Slanic area the specific activity of I-131
was about 6 Bq/dm^3
