Abstract
The validity of various analytical functions and semi-empirical formulae proposed for representing the full energy peak efficiency (FEPE) curves of Ge(Li) and HPGe detectors has been tested for the FEPE of 7.6 cm*7.6 cm and 5 cm*5 cm NaI(Tl) detectors in the gamma energy range from 59.5 to 1408.03 keV. The functions proposed by East (1971), and McNelles and Campbell (1973) provide by far the best representations of the present data. The semi-empirical formula of Mowatt (1969) describes the present data very well. The present investigation shows that some of the analytical functions and semi-empirical formulae, which represent the FEPE of the Ge(Li) and HPGe detectors very well, can be quite fruitfully used for NaI(Tl) detectors.
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