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

Radiocarbon ◽  
2021 ◽  
pp. 1-7
Author(s):  
Michel Fontugne ◽  
Christine Hatté ◽  
Michel Jaudon
Keyword(s):  
Proportional Counter ◽  
Cosmic Radiation ◽  
Background Level ◽  
Muon Flux ◽  
Underground Laboratory ◽  
Gas Proportional Counter

ABSTRACT 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.

scholarly journals Muon Flux Measurement at China Jinping Underground Laboratory

2020 ◽  
Author(s):  
Ziyi 郭子溢 Guo ◽  
Shaomin 陈少敏 Chen ◽  
zhe wang ◽  
Minfang Yeh ◽  
Linyan Wan ◽  
...  
Keyword(s):  
Flux Measurement ◽  
Muon Flux ◽  
Underground Laboratory

scholarly journals Tata Institute Radiocarbon Date List II

Radiocarbon ◽  
1964 ◽  
Vol 6 ◽  
pp. 226-232 ◽  
Author(s):  
D. P. Agrawal ◽  
S. Kusumgar ◽  
D. Lal ◽  
R. P. Sarna
Keyword(s):  
Oxalic Acid ◽  
Proportional Counter ◽  
Half Life ◽  
Radiocarbon Date ◽  
Naoh Pretreatment ◽  
Tata Institute ◽  
Gas Proportional Counter ◽  
Inorganic Fraction

The C14 dates presented here have been obtained by counting acetylene, synthesised from the sample, in an Oeschger-Houtermans’ gas proportional counter. The chemical and counting procedures have been described in some detail (Kusumgar et al., 1963a).Dates are based on the C14 half-life value of 5568 yr. For conversion of b.p. dates to a.d./b.c. scale, a.d. 1950 has been taken as the reference yr. Ninety-five % activity of NBS oxalic acid has been adopted as the value for the pre-1900 age-corrected wood.All samples were treated with dilute HCl. Whenever NaOH pretreatment was possible, it has been mentioned in the date list. In the case of bones, only the inorganic fraction has been dated.

Muon flux measurement in the shallow-underground laboratory Felsenkeller

2019 ◽  
Author(s):  
F. Ludwig ◽  
L. Wagner ◽  
T. Al-Abdullah ◽  
D. Bemmerer ◽  
K. Zuber
Keyword(s):  
Flux Measurement ◽  
Muon Flux ◽  
Underground Laboratory ◽  
Shallow Underground Laboratory

scholarly journals Comparison of Oceanic Δ14C Data with Those of GEOSECS: Vertical Profiles in 1973 (GEOSECS) and in 1980 at (30° N, 170° E) in the Northwestern Pacific Ocean

Radiocarbon ◽  
1987 ◽  
Vol 29 (1) ◽  
pp. 53-56 ◽  
Author(s):  
Toshitaka Gamo ◽  
Yoshio Horibe ◽  
Hiromi Kobayashi
Keyword(s):  
Proportional Counter ◽  
Vertical Profile ◽  
Sea Water ◽  
The Other ◽  
Northwestern Pacific ◽  
Vertical Profiles ◽  
Northwestern Pacific Ocean ◽  
Systematic Deviation ◽  
Gas Proportional Counter ◽  
Good Agreement

The vertical profile of radiocarbon at (30° N, 170° E) measured in 1980 was compared with the GEOSECS data measured in 1973. 14C was extracted from 200L of sea water, converted to C2H2, and analyzed with a gas proportional counter. Our profile and that of GEOSECS were in good agreement below 700m depth without systematic deviation of Δ14C values between both measurements. On the other hand, a Δ14C increase was observed above 700m depth, reflecting the transient addition, in 6.6 years, of bomb 14C to the intermediate layer from the atmosphere.

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