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Surface and Underground Ultra Low-Level Liquid Scintillation Spectrometry

  • Wolfango Plastino (a1) and Lauri Kaihola (a2)
Abstract

Cosmic background and its variation have been removed in the Gran Sasso National Laboratory (National Institute of Nuclear Physics) by its 1400-m rock overburden. Stable, high-performance liquid scintillation counting conditions are obtained when any remaining variable components of the environmental background, such as radon, are eliminated. The ultra low-level liquid scintillation spectrometer Quantulus™ has an anti-Compton guard detector (guard for short) that allows monitoring of gamma radiation in the background. The guard detector efficiency in radiocarbon background reduction is 8% in the Gran Sasso National Laboratory, while 80% is observed in surface laboratories. Thus, atmospheric pressure variations in surface laboratories cause variation in cosmic radiation flux. The Quantulus anti-Compton detector is highly efficient in detecting cosmic radiation, and the sample count rate remains stable in long-term counting. Also, correlation of sample backgrounds with environmental gamma radiation in various laboratories is examined.

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Copyright
COPYRIGHT: © 2004 by the Arizona Board of Regents on behalf of the University of Arizona 
Corresponding author
Corresponding author. Email: plastino@fis.uniroma3.it.
References
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Polach, H, Gover, J, Kojola, H, Heinonen, A. 1983. An ideal vial and cocktail for low-level scintillation counting: copper-shielded PTFE (Teflon) and butyl-PBD. In: McQuarrie, SA, Ediss, C, Wiebe, LI, editors. Advances in Scintillation Counting. Edmonton: University of Alberta Press. p 508–25.
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Radiocarbon
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  • EISSN: 1945-5755
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