Abstract
A simple method is proposed for determining the K shell fluorescence yield, ω K , using an NaI(Tl) detector coupled to an active filter amplifier and a 1K multi-channel analyser. By placing the target and the source right on the face of the detector, that is, by forming a 2π geometrical configuration, the intensities are measured by employing weak radioactive sources of strengths of the order of 10 4 Bq. The target criterion is suggested following Bambynek et al.'s prescription for optimization of target thickness. The ω K values were determined using several trials for each target to demonstrate the reliability and reproducibility of the method. The ω K values were obtained for lead, tantalum and gold elemental targets, and also for lead compounds and for some rare earth compounds. These values were compared with the recent standard fitted values of Hubbell et al. and were found to be in close agreement. The method is discussed in detail.
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