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Effects of ionizing radiation on the boreal forest

Abstract

The Field-Irradiator-Gamma (FIG) project chronically exposed a section of the boreal forest to ionizing radiation by placing a {sup 137}Cs source on tope of a 20-m tower at a forest site in southeastern Manitoba. The irradiation continued from 1973 to 1986 and the forest was exposed to radiological dose rates ranging from 65 mGy.h{sup -1} to 0.005 mGy.h{sup -1} along a gradient extending 500 m from the source. The irradiation killed the tree canopy close to the irradiator, resulting in the formation of a herbaceous zone of vegetation at high dose rates. After 14 years of irradiation, some tree species were still being affected at dose rates as low as about 1 mGy.h{sup -1}. The data gathered at the FIG site can be used to identify radiological dose rates that forest communities can tolerate. This information allows decisions to be made concerning guidelines for protection of the general environment from radionuclide emissions from various anthropogenic sources, such as nuclear reactors and uranium tailings. This report reviews the previous data collected at the FIG site during the pre-irradiation and irradiation phases and the methodology used to establish a baseline for future comparisons. Permanently marked sampling plots are a particular strength to  More>>
Authors:
Amiro, B D [1] 
  1. Atomic Energy of Canada Ltd., Chalk River, ON (Canada). Chalk River Nuclear Labs.
Publication Date:
Aug 01, 1995
Product Type:
Technical Report
Report Number:
INFO-0581
Reference Number:
SCA: 560140; PA: AIX-27:031199; EDB-96:074963; NTS-96:017784; SN: 96001578036
Resource Relation:
Other Information: PBD: Aug 1995
Subject:
56 BIOLOGY AND MEDICINE, APPLIED STUDIES; FORESTS; IONIZING RADIATIONS; DOSE RATES; DOSIMETRY; ENVIRONMENTAL IMPACTS; MANITOBA; RADIATION DOSES; RADIATION EFFECTS; RADIONUCLIDE KINETICS; RESEARCH PROGRAMS
OSTI ID:
217476
Research Organizations:
Atomic Energy Control Board, Ottawa, ON (Canada)
Country of Origin:
Canada
Language:
English
Other Identifying Numbers:
Other: ON: DE96620446; CNN: Project 7.168.1; TRN: CA9600002031199
Availability:
INIS; OSTI as DE96620446
Submitting Site:
INIS
Size:
77 p.
Announcement Date:
May 07, 1996

Citation Formats

Amiro, B D. Effects of ionizing radiation on the boreal forest. Canada: N. p., 1995. Web.
Amiro, B D. Effects of ionizing radiation on the boreal forest. Canada.
Amiro, B D. 1995. "Effects of ionizing radiation on the boreal forest." Canada.
@misc{etde_217476,
title = {Effects of ionizing radiation on the boreal forest}
author = {Amiro, B D}
abstractNote = {The Field-Irradiator-Gamma (FIG) project chronically exposed a section of the boreal forest to ionizing radiation by placing a {sup 137}Cs source on tope of a 20-m tower at a forest site in southeastern Manitoba. The irradiation continued from 1973 to 1986 and the forest was exposed to radiological dose rates ranging from 65 mGy.h{sup -1} to 0.005 mGy.h{sup -1} along a gradient extending 500 m from the source. The irradiation killed the tree canopy close to the irradiator, resulting in the formation of a herbaceous zone of vegetation at high dose rates. After 14 years of irradiation, some tree species were still being affected at dose rates as low as about 1 mGy.h{sup -1}. The data gathered at the FIG site can be used to identify radiological dose rates that forest communities can tolerate. This information allows decisions to be made concerning guidelines for protection of the general environment from radionuclide emissions from various anthropogenic sources, such as nuclear reactors and uranium tailings. This report reviews the previous data collected at the FIG site during the pre-irradiation and irradiation phases and the methodology used to establish a baseline for future comparisons. Permanently marked sampling plots are a particular strength to the study, whereby researchers can compare the present forest community with that measured during the past 25 years. (author). 53 refs., 6 tabs., 22 figs.}
place = {Canada}
year = {1995}
month = {Aug}
}