4-channel digital positron lifetime spectrometer for studying biological samples

Petri Sane, Simo Kilpelainen, Filip Tuomisto

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Abstract

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.
Original languageEnglish
Title of host publicationPOSITRON AND POSITRONIUM CHEMISTRY
EditorsSJ Wang, ZQ Chen, B Wang, YC Jean
Number of pages3
PublisherTrans Tech Publications Ltd
Publication date2009
Pages254-256
ISBN (Print)*****************
DOIs
Publication statusPublished - 2009
MoE publication typeA4 Article in conference proceedings
Event9th International Workshop on Positron and Positronium Chemistry - Wuhan
Duration: 11 May 200815 May 2008

Publication series

NameMaterials Science Forum
PublisherTRANS TECH PUBLICATIONS LTD
Volume607
ISSN (Print)0255-5476

Fields of Science

  • Digital positron lifetime measurement
  • 4-channel detector setup
  • Biomaterial
  • 114 Physical sciences

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