A development for determining the activity of radionuclides in the environmental sample by HPGE γ-spectroscopy using only one absolute efficiency value and an intrinsic efficiency

In the present work, we presented a development for determining the radioactivities in the environmental sample based on knowing only absolute (full-energy peak) efficiency value at the energy of 1460.83keV corresponding to characteristic γ-ray of 40K by using a reference in separate and an intrinsic (relative) efficiency function.