Applicability of pulse shape analysis methods in measurements of low energy gamma rays from human lungs
Pulssimuoto-analyysi menetelmiä sovellettiin gammaspektrometrisiin mittauksiin, tavoitteena vähentää matala-energistä Compton taustaa spektrissä. Tarkasteltu käytännön sovellus oli sisäänhengitetyn plutoniumin havaitseminen suorissa keuhkomittauksissa. Vuorovaikutussyvyyden ja pulssin nousuajan välillä ei löydetty mittauksissa yhteyttä. Mittauksissa käytetyssä plutonium-239 keuhkot sisältävässä phantomissa oli ei-toivottu americium-241 kontaminaatio. Työssä keskustellaan myös mittarisuunnittelun keinoista, joilla pulssimuotoanalyysin tehokkuutta voitaisiin parantaa. Pulse shape analysis methods were applied to gamma spectroscopy measurements in an attempt to reduce the contribution from low-energy Compton background events, with focus on measuring inhaled plutonium from human lungs. No link between interaction depth and pulse rise time was found with the BEGe-detector used. The human torso phantom with plutonium-239 incorporated lungs used in the measurements had an undesired americium-241 contamination. Detector properties that would better enable pulse shape analysis to enhance detector performance are discussed.
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