A nondestructive gamma spectrometric method has been developed to get a quantitative estimate for the neutron fluence obtained by slightly irradiated low-enriched uranium. The approach is based on intrinsic calibration method and applicable whenever 234mPa γ-lines can be seen and secular equilibrium between 238U and 234Th ( T 1 2 = 24.1 d ) is attained. The obtained fluence and the plutonium buildup is estimated directly from the measured 137Cs/ 238U activity ratio, providing a high level of independence from the irradiation history data. Although enrichment is an input datum, under favourable conditions it can be determined from the same γ-spectrum as well. The method and its sensitivity was demonstrated for the case of slightly irradiated fuel rods.