{"title":"Studies of fresh and fossil tracks in meteoritic hypersthene","authors":"R.K. Bull, S.A. Durrani","doi":"10.1016/0145-224X(77)90026-6","DOIUrl":null,"url":null,"abstract":"<div><p>From measurements of the total recordable lengths of fossil tracks and freshly-produced Fe ion tracks in meteoritic hypersthene, the abundance of Fe relative to all VH ions (20 ≦ <em>Z</em> ≦ 28) in the time-averaged cosmic-ray flux is found to be ≈ 0.35. After allowance is made for the effects of fragmentation of nuclei at a depth of ≈ 11 cm within the meteorite, this value is found to be in broad agreement with presentday measurements.</p><p>These crystals have been irradiated with a number of heavy ions with a view to calibrating them for the identification of VVH cosmic rays by measurement of track-etch velocity, <em>V<sub>T</sub></em>, as a function of residual range. A good fit to the calibration data is obtained by using a value for the constant <em>K</em> in the primary-ionization equation of 10.5 (±0.5). The relationship between <em>V<sub>T</sub></em> and primary ionization <em>J</em> appears to be approximately linear.</p></div>","PeriodicalId":100974,"journal":{"name":"Nuclear Track Detection","volume":"1 1","pages":"Pages 75-80"},"PeriodicalIF":0.0000,"publicationDate":"1977-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0145-224X(77)90026-6","citationCount":"6","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Nuclear Track Detection","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0145224X77900266","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 6
Abstract
From measurements of the total recordable lengths of fossil tracks and freshly-produced Fe ion tracks in meteoritic hypersthene, the abundance of Fe relative to all VH ions (20 ≦ Z ≦ 28) in the time-averaged cosmic-ray flux is found to be ≈ 0.35. After allowance is made for the effects of fragmentation of nuclei at a depth of ≈ 11 cm within the meteorite, this value is found to be in broad agreement with presentday measurements.
These crystals have been irradiated with a number of heavy ions with a view to calibrating them for the identification of VVH cosmic rays by measurement of track-etch velocity, VT, as a function of residual range. A good fit to the calibration data is obtained by using a value for the constant K in the primary-ionization equation of 10.5 (±0.5). The relationship between VT and primary ionization J appears to be approximately linear.
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