Abstract
The intensities of some gamma-ray lines emitted from
234Th and
234Pa are usually used to estimate the concentrations of
238U in different environmental samples. However, the absolute intensity values currently available for some gamma-ray lines which are used for determination of these concentrations seem to be inaccurate and include some discrepancies. In the present work, the absolute intensity values for some gamma-ray lines of
235U,
234Th and
234Pa have been studied and precisely evaluated using a hyper pure germanium high-resolution gamma spectrometer.