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Absence of storage effects on radiation damage after thermal neutron irradiation of dry rice seeds

Abstract

Storage effects on dry rice seeds equilibrated to 6.8% moisture content were examined after irradiation with X-rays of 5, 10, 20 and 40 kR and with thermal neutrons of 2.1, 4.2, 6.3 and 8.4×10{sup 13}N{sub th}/cm{sup 2}. Reduction in root growth was estimated from dose response curves after storage periods of 1 hr to 21 days. The longer the storage period, the greater enhancement of radiation damages in X-irradiated seeds. There were two components in the storage effect, i. e., a rapid increase of radiosensitivity within the first 24 hr and a slow increase up to 21 days. An almost complete absence of a storage effect was observed after thermal neutron exposure, in spite of considerably high radioactivities of the induced nuclides, {sup 56}Mn, {sup 42}K and {sup 24}Na, which were detected from gamma-ray spectrometry of the irradiated seeds. The present results suggest that the contributions of gamma-rays from the activated nuclides and of inherent contaminating gamma-rays are little or negligible against the neutron-induced damage, and that the main radiobiological effects of thermal neutrons are ascribed to in situ radiations, i, e., heavy particles resulting from neutron-capture reaction of atom. A mechanism underlying the absence of storage effect after thermal  More>>
Authors:
Kowyama, Y.; [1]  Saito, M.; Kawase, T.
  1. Mie Univ., Tsu (Japan)
Publication Date:
Sep 15, 1987
Product Type:
Journal Article
Resource Relation:
Journal Name: Ikushugaku Zasshi; Journal Volume: 37; Journal Issue: 3; Other Information: FAO/AGRIS record; ARN: JP8901541; Country of input: International Atomic Energy Agency (IAEA)
Subject:
60 APPLIED LIFE SCIENCES; DIAGRAMS; DOSES; DRYING; GAMMA RADIATION; GAMMA SPECTROSCOPY; GROWTH; IRRADIATION; MANGANESE 56; MOISTURE; NEUTRON REACTIONS; POTASSIUM 42; RADIATION INJURIES; RADIOACTIVITY; RADIOSENSITIVITY; RICE; ROOTS; SEEDS; SODIUM 24; STORAGE; THERMAL NEUTRONS; X RADIATION
OSTI ID:
22320492
Country of Origin:
FAO
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 0536-3683; TRN: XF14B6824026694
Availability:
Available on-line: http://miuse.mie-u.ac.jp/bitstream/10076/8528/1/50A6645.pdf
Submitting Site:
INIS
Size:
page(s) 299-308
Announcement Date:
Apr 06, 2015

Citation Formats

Kowyama, Y., Saito, M., and Kawase, T. Absence of storage effects on radiation damage after thermal neutron irradiation of dry rice seeds. FAO: N. p., 1987. Web. doi:10.1270/jsbbs1951.37.299.
Kowyama, Y., Saito, M., & Kawase, T. Absence of storage effects on radiation damage after thermal neutron irradiation of dry rice seeds. FAO. doi:10.1270/jsbbs1951.37.299.
Kowyama, Y., Saito, M., and Kawase, T. 1987. "Absence of storage effects on radiation damage after thermal neutron irradiation of dry rice seeds." FAO. doi:10.1270/jsbbs1951.37.299. https://www.osti.gov/servlets/purl/10.1270/jsbbs1951.37.299.
@misc{etde_22320492,
title = {Absence of storage effects on radiation damage after thermal neutron irradiation of dry rice seeds}
author = {Kowyama, Y., Saito, M., and Kawase, T.}
abstractNote = {Storage effects on dry rice seeds equilibrated to 6.8% moisture content were examined after irradiation with X-rays of 5, 10, 20 and 40 kR and with thermal neutrons of 2.1, 4.2, 6.3 and 8.4×10{sup 13}N{sub th}/cm{sup 2}. Reduction in root growth was estimated from dose response curves after storage periods of 1 hr to 21 days. The longer the storage period, the greater enhancement of radiation damages in X-irradiated seeds. There were two components in the storage effect, i. e., a rapid increase of radiosensitivity within the first 24 hr and a slow increase up to 21 days. An almost complete absence of a storage effect was observed after thermal neutron exposure, in spite of considerably high radioactivities of the induced nuclides, {sup 56}Mn, {sup 42}K and {sup 24}Na, which were detected from gamma-ray spectrometry of the irradiated seeds. The present results suggest that the contributions of gamma-rays from the activated nuclides and of inherent contaminating gamma-rays are little or negligible against the neutron-induced damage, and that the main radiobiological effects of thermal neutrons are ascribed to in situ radiations, i, e., heavy particles resulting from neutron-capture reaction of atom. A mechanism underlying the absence of storage effect after thermal neutron irradiation was briefly discussed on the basis of radical formation and decay. (author)}
doi = {10.1270/jsbbs1951.37.299}
journal = {Ikushugaku Zasshi}
issue = {3}
volume = {37}
journal type = {AC}
place = {FAO}
year = {1987}
month = {Sep}
}