Abstract：
:The detection of (41)Ca atoms in tooth enamel using accelerator mass spectrometry is suggested as a method capable of reconstructing thermal neutron exposures from atomic bomb survivors in Hiroshima and Nagasaki. In general, (41)Ca atoms are produced via thermal neutron capture by stable (40)Ca. Thus any (41)Ca atoms present in the tooth enamel of the survivors would be due to neutron exposure from both natural sources and radiation from the bomb. Tooth samples from five survivors in a control group with negligible neutron exposure were used to investigate the natural (41)Ca content in tooth enamel, and 16 tooth samples from 13 survivors were used to estimate bomb-related neutron exposure. The results showed that the mean (41)Ca/Ca isotope ratio was (0.17 +/- 0.05) x 10(-14) in the control samples and increased to 2 x 10(-14) for survivors who were proximally exposed to the bomb. The (41)Ca/Ca ratios showed an inverse correlation with distance from the hypocenter at the time of the bombing, similar to values that have been derived from theoretical free-in-air thermal-neutron transport calculations. Given that gamma-ray doses were determined earlier for the same tooth samples by means of electron spin resonance (ESR, or electron paramagnetic resonance, EPR), these results can serve to validate neutron exposures that were calculated individually for the survivors but that had to incorporate a number of assumptions (e.g. shielding conditions for the survivors).
journal_name
Radiat Resjournal_title
Radiation researchauthors
Wallner A,Rühm W,Rugel G,Nakamura N,Arazi A,Faestermann T,Knie K,Maier HJ,Korschinek Gdoi
10.1667/RR2043.1subject
Has Abstractpub_date
2010-08-01 00:00:00pages
137-45issue
2eissn
0033-7587issn
1938-5404journal_volume
174pub_type
杂志文章abstract：:Whether inner-shell ionizations of DNA atoms, called core ionizations, are critical events for cell inactivation by ionizing radiations such as 100 keV electrons and gamma rays has been investigated. The number of core ionizations in DNA atoms per gray of the two types of radiations is calculated from various Monte Ca...
journal_title：Radiation research
pub_type： 杂志文章
doi：10.1667/RR0451.1
更新日期：2007-04-01 00:00:00
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pub_type： 杂志文章,评审
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更新日期：2012-12-01 00:00:00
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journal_title：Radiation research
pub_type： 杂志文章,评审
doi：10.1667/rr2933.1
更新日期：2012-07-01 00:00:00
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journal_title：Radiation research
pub_type： 杂志文章
doi：
更新日期：1989-03-01 00:00:00
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journal_title：Radiation research
pub_type： 杂志文章
doi：10.1667/0033-7587(2000)153[0201:eotfod]2.0.co;2
更新日期：2000-02-01 00:00:00
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journal_title：Radiation research
pub_type： 杂志文章
doi：
更新日期：1988-06-01 00:00:00
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journal_title：Radiation research
pub_type： 杂志文章
doi：
更新日期：1990-09-01 00:00:00
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journal_title：Radiation research
pub_type： 杂志文章
doi：
更新日期：1988-03-01 00:00:00
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pub_type： 杂志文章
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更新日期：2016-11-01 00:00:00
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pub_type： 杂志文章
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更新日期：2011-05-01 00:00:00
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journal_title：Radiation research
pub_type： 杂志文章,评审
doi：
更新日期：1996-05-01 00:00:00
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journal_title：Radiation research
pub_type： 杂志文章
doi：10.1667/RR1469.1
更新日期：2009-02-01 00:00:00
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journal_title：Radiation research
pub_type： 杂志文章
doi：
更新日期：1991-01-01 00:00:00
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journal_title：Radiation research
pub_type： 杂志文章
doi：10.1667/RR13452.1
更新日期：2014-03-01 00:00:00
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journal_title：Radiation research
pub_type： 杂志文章
doi：
更新日期：1997-07-01 00:00:00
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journal_title：Radiation research
pub_type： 杂志文章
doi：
更新日期：1993-11-01 00:00:00
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journal_title：Radiation research
pub_type： 杂志文章
doi：10.1667/RR2165.1
更新日期：2010-10-01 00:00:00
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journal_title：Radiation research
pub_type： 杂志文章
doi：
更新日期：1986-05-01 00:00:00
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journal_title：Radiation research
pub_type： 杂志文章
doi：
更新日期：1991-09-01 00:00:00
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journal_title：Radiation research
pub_type： 杂志文章
doi：
更新日期：1995-05-01 00:00:00
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pub_type： 杂志文章
doi：
更新日期：1997-09-01 00:00:00
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pub_type： 杂志文章
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更新日期：2012-02-01 00:00:00
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journal_title：Radiation research
pub_type： 杂志文章
doi：
更新日期：1984-12-01 00:00:00
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journal_title：Radiation research
pub_type： 杂志文章
doi：
更新日期：1989-07-01 00:00:00
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journal_title：Radiation research
pub_type： 杂志文章
doi：
更新日期：1983-04-01 00:00:00
abstract：:The goal of this study was to make a comparison between stereotactic brachytherapy implants and linear accelerator-based radiosurgery of brain tumors with respect to physical dose distributions and radiobiological efficacy. Twenty-four treatment plans made for irradiation of brain tumors with low-dose-rate (125)I brac...
journal_title：Radiation research
pub_type： 杂志文章
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更新日期：2006-06-01 00:00:00
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journal_title：Radiation research
pub_type： 杂志文章
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更新日期：2015-09-01 00:00:00
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journal_title：Radiation research
pub_type： 杂志文章
doi：
更新日期：1985-01-01 00:00:00
