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).
Fowler, J. F., and Farmer, F. T., Nature, 171, 1020 (1953).
Fowler, J. F., and Farmer, F. T., Nature, 174, 136 (1954).
Fowler, J. F., and Farmer, F. T., Nature, 174, 800 (1954).
Farmer, F. T., Nature, 150, 521 (1942).
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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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