{"title":"Calibration method in isotopic carbon analysis","authors":"Zhang Weicheng, Li Liwu","doi":"10.1016/0883-2889(92)90206-T","DOIUrl":null,"url":null,"abstract":"<div><p>Unlike neutrons or gamma-rays, charged particles readily lose energy when they penetrate matter; thus, the main difficulty in its calculation is, perhaps, the complication introduced in its mathematical treatment. In our experiments, determination of <sup>13</sup>C in breath test samples by proton-induced gamma-ray emission, interesting regularities were found that allowed drastic simplification in the theoretical treatment of the problem, and led to the derivation from first principles of a simple, sufficiently accurate basic equation which proved reliable for the determination of the isotopic abundance ratio <span><math><msup><mi></mi><mn>13</mn></msup><mtext>C</mtext><msup><mi></mi><mn>12</mn></msup><mtext>C</mtext></math></span> by low-energy proton bombardment of biological samples with simultaneous prompt gamma spectrometry.</p></div>","PeriodicalId":14288,"journal":{"name":"International Journal of Radiation Applications and Instrumentation. Part A. Applied Radiation and Isotopes","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0883-2889(92)90206-T","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Radiation Applications and Instrumentation. Part A. Applied Radiation and Isotopes","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/088328899290206T","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
Unlike neutrons or gamma-rays, charged particles readily lose energy when they penetrate matter; thus, the main difficulty in its calculation is, perhaps, the complication introduced in its mathematical treatment. In our experiments, determination of 13C in breath test samples by proton-induced gamma-ray emission, interesting regularities were found that allowed drastic simplification in the theoretical treatment of the problem, and led to the derivation from first principles of a simple, sufficiently accurate basic equation which proved reliable for the determination of the isotopic abundance ratio by low-energy proton bombardment of biological samples with simultaneous prompt gamma spectrometry.