Abstract
THE conductivity induced in unplasticized ‘Perspex’ (polymethylmethacrylate) by X-rays differs markedly from that induced in ordinary plasticized ‘Perspex’. First, the time-constant of recovery after irradiation is very long (several hours) for the unplasticized material, whereas for ordinary ‘Perspex’ it is much shorter1. Secondly, the equilibrium induced current i x is related to the dose-rate R by the general formula: where Δ = 0.55 ± 0.05 for unplasticized ‘Perspex’, but Δ is nearly unity for plasticized ‘Perspex’. These properties place unplasticized ‘Perspex’ in the same class of behaviour as polyethylene1,2, polytetrafluorothene3, and polystyrene4,5.
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References
Fowler, J. F., and Farmer, F. T., Nature, 173, 317 (1954).
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Fowler, J. F., and Farmer, F. T., Nature, 174, 136 (1954).
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FOWLER, J., FARMER, F. Conductivity induced in Unplasticized ‘Perspex’ by X-rays. Nature 175, 516–517 (1955). https://doi.org/10.1038/175516a0
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DOI: https://doi.org/10.1038/175516a0
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