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Observations of short-range, high-LET recoil tracks in CR-39 plastic nuclear track detector by visible light microscopy
https://repo.qst.go.jp/records/46036
https://repo.qst.go.jp/records/460367e8cd912-44d0-4879-8492-eaffd21d7fc7
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2011-05-09 | |||||
| タイトル | ||||||
| タイトル | Observations of short-range, high-LET recoil tracks in CR-39 plastic nuclear track detector by visible light microscopy | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | journal article | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Benton, Eric
× Benton, Eric× Johnson, Carl× DeWitt, Joel× Yasuda, Nakahiro× et.al× 安田 仲宏 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Using standard visible light microscopy, we are able to observe particle tracks produced by <10 micro meter range target fragment recoils in CR-39 plastic nuclear track detector (PNTD) following short chemical etching (bulk etch B < 1 micro meter). In accelerator irradiations, targets of varying composition, including a number of elemental targets of high Z, were exposed in contact with layers of CR-39 PNTD to beams of 60 MeV, 230 MeV, and 1 GeV protons at doses of 10 - 50 Gy. Chemical etching of CR-39 under standard conditions (50 degreeC, 6.25 N NaOH) for 2 - 4 h (removed layer B = 0.5 - 1.0 mm) yielded secondary track densities of 10^5 - 10^6 cm2 observable under a standard optical microscope with 500x - 800x magnification. Ordinarily such a short duration etch would not be expected to enlarge the tracks sufficiently for them to be resolved by visible light optics. However, due to the short-range of the particles, a longer chemical processing would have over-etched the tracks until they were no longer recognizable. The tracks we observe in CR-39 PNTD irradiated in these experiments are the result of residual heavy recoil fragments returning to equilibrium via evaporation processes following proton-induced knock out of light particles via preequilibrium processes. Because the heavy recoil particles are very near the end of their ranges (i.e. in the Bragg peak), their LET is extremely high and changes rapidly. Consequently, the tracks they produce in CR-39 PNTD often take the form of long tubes rather than the conical etch pits produced by higher energy particles. |
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| 書誌情報 |
Radiation Measurements 巻 46, 号 5, p. 527-532, 発行日 2011-05 |
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| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 1350-4487 | |||||
