Journal
RADIATION MEASUREMENTS
Volume 105, Issue -, Pages 1-6Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.radmeas.2017.06.003
Keywords
MultiCell spectrometer; Rapid C-14 dating; Rn-222 contribute correction; Delayed coincidence method; Bi-214/Po-214 pairs counting
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Funding
- National Centre for Research and Development in Poland [LIDER/001/404/L-4/12/NCBR/2013]
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This paper presents a low-level liquid scintillation counting spectrometer with five identical counting units that allow simultaneous measurements to be performed. The counting chambers are enclosed in high purity copper and lead shielding which significantly decreases the background count rate. Each of the five counting chambers is equipped with a high stability software-controllable power supply, and each counting module contains a signal analyzer that measures the pulse height, pulse shape and the time between subsequent pulses, returning all the data as a time-stamped sequence which enables the identification of pulse pairs. Such pulse pairs, arising from the decay of Bi-214/Po-214, provides a sensitive tool for Rn-222 contamination determination in low-level C-14 measurements. This enables radiocarbon dating or bio-component determination to be performed directly after liquid scintillator production without the risk of Rn-222 interfering with the measurement of C-14. (C) 2017 Elsevier Ltd. All rights reserved.
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