Natural tritium deposition over Antarctica and estimation of the mean global production rate

Details Natural tritium deposition over Antarctica and estimation of the mean global production rate Natural tritium deposition over Antarctica and estimation of the mean global production rate

Oct 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982georl...9.1191j&link_type=abstract

Geophysical Research Letters, vol. 9, Oct. 1982, p. 1191-1194. Research supported by the Delegation Generale a la Recherche, Sci

Astronomy and Astrophysics

Astronomy

6

Abundance, Antarctic Regions, Deposition, Tritium, Cosmic Rays, Incident Radiation, Long Term Effects, Rates (Per Time), Snow

Scientific paper

Tritium content was measured in snow deposited in Antarctica before the first arrival of artificial tritium (1954), both at Dome C (74 deg 39 min S) and South Pole. The mean tritium values at the time of precipitation are equal to 32 plus or minus 2 and 26 plus or minus 3 TU at South Pole (1939-1942) and Dome C (1951) respectively. A seasonal pattern of natural tritium fallout identical to the artificial pattern (with a winter maximum) is observed in the South Pole profile. The deposition rate of natural tritium is 0.6 and 0.2 tritium atoms per sq cm s at South Pole and Dome C respectively. Its geographical variation over Antarctica appears quite similar to that existing for artificial tritium, clearly showing that the same mechanisms govern the deposition of natural and artificial tritium, in particular tritium injection over polar regions during Antarctic winter. A mean deposition rate of 0.37 tritium atoms per sq cm s, over Antarctica is derived giving an estimated mean global production rate of 0.2 tritium atoms per sq cm s. This strongly suggests that natural tritium results only from cosmic ray production.

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