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To the Measurements of 3γ/2γ Ratio for Positron Annihilation in Matter Using Annihilation Energy Spectrum

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Andrukhovich S., Berestov A., Antovich N., Metelitsa O.
Acta Physica Polonica A
|
2001
|
vol. 99
|
issue 3-4
315-320
EN
Processes of the summation of cascadeγ-quanta usually neglected, when registering the annihilation energy spectrum for the determination of the three-photon annihilation probability P_{3γ} of positronium in samples, are studied. The deviations of the actual P_{3γ} value from that determined without allowance made for the summation processes are 56% and 25% for NaI(Tl) and Ge detectors placed at the distance of 3 cm from a positron source, respectively.
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