A high correlation exists between the time decay constant of thermal neutrons in the fixed sample-moderator system and the absorption rate of the sample. The correlation allowed to elaborate a fast method of determination of the thermal neutron macroscopic absorption cross section of the rock matrix. Numerous experimental results obtained by Czubek's method, i.e. the time decay constants measured in the two-region cylindrical sample-moderator systems and the absorption rates determined for the samples, were sufficient to be used as the data to calculate the calibration lines utilising the existing correlation. Every line has been prepared for a fixed size of the moderator. The regression analysis made for the linear model shows that a fit of the straight line to the experimental data gives very good results.
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