EXPERIMENTS AT MODANE UNDERGROUND LABORATORY OR THE SWAN SONG OF RADIOCARBON ß-COUNTING BY GAS PROPORTIONAL COUNTER

In 1991, a 14C ß-counting installation with four proportional CO2 gas counters was tested at the Modane underground laboratory, 1700 m below the summit of Pointe du Fréjus, reducing the muon flux to 4 muons per square meter and per day. With cosmic radiation attenuated by a factor of 2.106, the back...

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Bibliographic Details
Published in:Radiocarbon 2022-06, Vol.64 (3), p.607-613
Main Authors: Fontugne, Michel, Hatté, Christine, Jaudon, Michel
Format: Article
Language:English
Subjects:
Charged particles
Continental interfaces, environment
Cosmic rays
Gases
Laboratories
Muons
Ocean, Atmosphere
Proportional counters
Radiation
Sciences of the Universe
Technical Note
Ventilation
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Summary:In 1991, a 14C ß-counting installation with four proportional CO2 gas counters was tested at the Modane underground laboratory, 1700 m below the summit of Pointe du Fréjus, reducing the muon flux to 4 muons per square meter and per day. With cosmic radiation attenuated by a factor of 2.106, the background level of the counters was reduced by 65 to 85% while its variability was reduced by a factor of 30–80 depending on the type of counter. The dating limit of these counters extends to well beyond 60,000 years.
ISSN:0033-8222
1945-5755
DOI:10.1017/RDC.2021.86