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- W1965780477 abstract "Alpha particles crosslink films of polyethylene more effectively than do sparsely ionizing radiations, but even in the absence of oxygen alpha -rays produce simultaneously some main-chain scission. Polymethyl methacrylate films were degraded by alpha -particles, but thc energy needed to produce a main-chain break (deteeted by viscoslty measurements) was 263 ev as opposed to approximately 60 ev wlth the 2Mev electrons. The addition of naphthalene and 8- hydroxyqulnoline to the polymethyl mncthaerylate dtd not lead to protection agalnst alpha -radlation, although these substances protect against sparsely ionizing radiations. The reasons the relative effectiveness of alpha -rays ls greater than that of sparsely ionizlng radtations for crosslinking and less for degradation are dlscussed. it is postulated th:mt the molecules in polynwethyl methacrylate are mn a randomly coiled eonfiguration and that they are broken.m.t several points where a segment is traversed by an alpha -particle. the small molecules produced by the closely spaced breaks being wtthout effect on the vlscostty molecular wvelght. ln lmolyethylene films the molecules are oriented parallcl to the sheet, and the path length of an alpha -particle through them is such that few ionizations are wasted. The production of main-chain scission is attributed to dissociation of a C-Cmore » bond. Recombination by a Franck-Rabinowitch cage effect is postulated to occur with sparsely ionizing but not with densely ionizing iadiatiuns. (auth)« less" @default.
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- W1965780477 date "1961-11-01" @default.
- W1965780477 modified "2023-09-23" @default.
- W1965780477 title "The Effect of Polonium Alpha Rays on the Physical Properties of Polyethylene and of Polymethyl Methacrylate" @default.
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- W1965780477 doi "https://doi.org/10.2307/3571136" @default.
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