4-channel digital positron lifetime spectrometer for studying biological samples

Petri Sane, Simo Kilpelainen, Filip Tuomisto

    Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskapligPeer review

    Sammanfattning

    In this work a novel detector setup for PALS-studies on biomolecular materials is presented. When pursuing optimal detecting efficiency and lifetime component resolution one must make compromises when using only one detector pair. With smaller scintillation heads the resolution is higher, but the detecting efficiency decreases and vice versa. When measuring biological materials that do not withstand long measurement periods, sacrifices are made for gaining efficiency. The price of this optimization is low resolution of the lifetime components, namely separating the always present water's lifetime component of similar to 1.8 ns from the actual material's lifetime component, typically >2 ns. A solution to this problem is measuring the annihilation spectra with two individual detector pairs simultaneously. Using analog setup, it would require duplicate ADC-hardware that are both expensive and degrade by time. With a fully digital setup, the need for hardware is smaller and the precision of the setup is constant during its service life.
    Originalspråkengelska
    Titel på gästpublikationPOSITRON AND POSITRONIUM CHEMISTRY
    RedaktörerSJ Wang, ZQ Chen, B Wang, YC Jean
    Antal sidor3
    FörlagTrans Tech Publications Ltd
    Utgivningsdatum2009
    Sidor254-256
    ISBN (tryckt)*****************
    DOI
    StatusPublicerad - 2009
    MoE-publikationstypA4 Artikel i en konferenspublikation
    Evenemang9th International Workshop on Positron and Positronium Chemistry - Wuhan
    Varaktighet: 11 maj 200815 maj 2008

    Publikationsserier

    NamnMaterials Science Forum
    FörlagTRANS TECH PUBLICATIONS LTD
    Volym607
    ISSN (tryckt)0255-5476

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