Authors:
Y. Yamada Hokuriku University Faculty of Pharmaceutical Sciences Kanagawa-machi 920-11 Kanazawa Japan

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K. Yasuike Hokuriku University Faculty of Pharmaceutical Sciences Kanagawa-machi 920-11 Kanazawa Japan

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M. Itoh Ishikawa Prefectural Institute of Public Health and Environmental Science Taiyogaoka 1-11 920-11 Kanazawa Japan

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N. Kiriyama Hokuriku University Faculty of Pharmaceutical Sciences Kanagawa-machi 920-11 Kanazawa Japan

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K. Komura Kanazawa University Low Level Radioactivity Laboratory Taisunokuchi-machi 923-12 Ishikawa Japan

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K. Ueno Kanazawa University Low Level Radioactivity Laboratory Taisunokuchi-machi 923-12 Ishikawa Japan

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Abstract  

The carbon-14 concentration in tree-ring cellulose of an 80-year-old pine tree which has been used for tritium measurement was measured during the 1941–1987 period. This was done to determine the formation year of each tree ring in order to study the pathway of tritium uptake into the tree rings. In the 1941 to 1953 period, the Δ14C value remained slightly lower than 0%., It began to increase from 1954 to a small broad peak of 250% between 1959 and 1961, followed by rapid increase to the highest value of approximately 800% in 1964. Since 1964, it had been diminishing year by year to reach a level of 190% in 1987. The two peak years coincided with those in the known carbon-14 patterns in tree rings. However, there existed a difference in the amplitude of the Δ14C values during the period of 1963–1967.

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
Foundation
1968
Volumes
per Year
1
Issues
per Year
12
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)