Accelerator-measured 14C activity in tree rings from the vicinity of the first atomic bomb test

Research output: Contribution to journalArticle

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Abstract

Detonation of the first fission bomb at White Sands, New Mexico, on July 16, 1945, produced a tremendous neutron flux capable of creating tritium and radiocarbon byproducts. The authors sampled a 115-year-old pinyon Pinus edulis 10km E of the Trinity test site to determine 14C evidence of this event. The most likely mechanism for this enrichment in the 1945 tree ring would be fixation of 14CO2 produced at the blast site and carried with the fallout cloud over the pinyon site. Analysis of cellulose of the 1944 and 1945 rings shows δ13C values of -19.9 and -19.5‰, respectively, and 14C activity (fraction of modern uncorrected for δ13C) as 0.991 ± .005 and 0.991 ± .006, respectively. It is likely that the duration and/or concentration of the 14CO2 exposure was not sufficient to increase 14C activity expected for that year. -Authors

Original languageEnglish (US)
Pages (from-to)762-765
Number of pages4
JournalRadiocarbon
Volume31
Issue number3
StatePublished - 1990
Externally publishedYes

Fingerprint

Fallout
Tritium
Neutron flux
tritium
Detonation
fallout
tree ring
Cellulose
Particle accelerators
fixation
Byproducts
cellulose
Sand
sand
exposure
analysis
test
Atomic Bomb
Tree Rings
Accelerator

ASJC Scopus subject areas

  • Polymers and Plastics

Cite this

Accelerator-measured 14C activity in tree rings from the vicinity of the first atomic bomb test. / Leavitt, Steven; Long, A.

In: Radiocarbon, Vol. 31, No. 3, 1990, p. 762-765.

Research output: Contribution to journalArticle

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AB - Detonation of the first fission bomb at White Sands, New Mexico, on July 16, 1945, produced a tremendous neutron flux capable of creating tritium and radiocarbon byproducts. The authors sampled a 115-year-old pinyon Pinus edulis 10km E of the Trinity test site to determine 14C evidence of this event. The most likely mechanism for this enrichment in the 1945 tree ring would be fixation of 14CO2 produced at the blast site and carried with the fallout cloud over the pinyon site. Analysis of cellulose of the 1944 and 1945 rings shows δ13C values of -19.9 and -19.5‰, respectively, and 14C activity (fraction of modern uncorrected for δ13C) as 0.991 ± .005 and 0.991 ± .006, respectively. It is likely that the duration and/or concentration of the 14CO2 exposure was not sufficient to increase 14C activity expected for that year. -Authors

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