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The stability of in situ readings of the portable gamma-ray spectrometer GS256 during the field season of 2006 was studied. The instrument is an impulse detec- tor of gamma rays based on NaI(Tl) 3 × 3 scintillation unit and 256-channel spectral analyzer which allows simultaneous assessment of up to 8 radioisotopes in rocks. It is commonly used in surface geophysical survey for the measurement of natural 40 K, 238 U and 232 Th but also artificial 137 Cs quantities. The statistical evaluation is given of both repeated measurements - in the laboratory and at several field control points in different survey areas. The variability of values shows both the instrument stability and also the relative influence of some meteorological factors, mainly rainfalls. The analysis shows an acceptable level of instrument measurements stability, the ne- cessity to avoid measurement under unfavourable meteorological conditions and to keep detailed field book information about time, position and work conditions.

Field gamma-ray spectrometer GS256: measurements stability