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Chlorine-36 in granite samples from the Hiroshima A-bomb site
- Source :
-
Nuclear Instruments & Methods in Physics Research Section B . Aug2004, Vol. 223-224, p782-787. 6p. - Publication Year :
- 2004
-
Abstract
- 36Cl is a long-lived radioisotope, which, because it is created mainly through a thermal neutron capture process by 35Cl, may be used to estimate the strength of thermal neutron flux from A-bombs or nuclear fuel facilities. The 36Cl contents in granite samples from the Hiroshima A-bomb site have been measured by the Cl-36 accelerator mass spectrometry (AMS) system at the University of Tsukuba. The 36Cl/Cl ratios deduced from the 36Cl measurements are compared with independent evaluations based upon the Dosimetry System 2002 (DS02) of the radiation doses received by the survivors of the Hiroshima A-bomb. The measurements corresponded well up to a ground distance of 1100 m, which proved the effectiveness of the DS02. Measurements of the 36Cl/Cl ratio of unexposed granite samples were 1.92 × 10-13 on average, and because the measured ratio for samples at a ground distance of 1163 m was 2.50 × 10-13, the assessment of the neutron flux by the 36Cl measurements of samples beyond about 1100 m is not practical. This limitation arises from the inability to distinguish bomb-induced Cl-36 from activation due to ambient sources. [Copyright &y& Elsevier]
- Subjects :
- *CHLORINE
*ATOMIC bomb
*NEUTRONS
Subjects
Details
- Language :
- English
- ISSN :
- 0168583X
- Volume :
- 223-224
- Database :
- Academic Search Index
- Journal :
- Nuclear Instruments & Methods in Physics Research Section B
- Publication Type :
- Academic Journal
- Accession number :
- 14168872
- Full Text :
- https://doi.org/10.1016/j.nimb.2004.04.145