  The experience of discovery of the radioactive products which have released
into atmosphere of Sakhalin region from Fukushima Daiichi accident is
presented. Sampling of airborne particulates and atmosphere fallout was carried
out by means of the air ventilation set and horizontal gauze planchs,
respectively. The HPGe detector was used for gamma analyses of the airborne
samples. Since 23 March we confidently measured 131I in the airborne samples,
after 03.04.2011 we also registered a rise of activity 137Cs and 134Cs. 132Te
and 132I were discovered in ashen sample of the planch, which had exposed in
Youzhno-Kurilk from 14 to 17 March. The effect of the pairs production when in
the samples 208Tl presence, which emits gamma-quanta of 2615 keV, causes a rise
in apparatus spectra of the peak corresponding to energy 1593 keV, which could
be in error ascribed to 140La. It had been experimentally shown that the
systematic reduction of 134Cs content in measuring samples due to effect of
gamma - gamma coincidence did not exceed 7 % (for the detector and geometry of
the measurement used).
