GB1355815A - Method of detecting cerenkov radiation - Google Patents

Abstract

1355815 Radiation detecting polymer compositions NEW ENGLAND NUCLEAR CORP 28 May 1971 [12 June 1970] 17870/71 Heading C3P [Also in Divisions G6 and C4] A method of detecting charged particles using the Cerenkov effect, comprises allowing the charged particles to impinge on a solid detector body being light transmitting material having an exposed edge through which light pulses may be observed and having inherent negligible or readily quenchable scintillation characteristics and containing dispersed through the base material from one per cent to thousands of a per cent (by wt.) of at least one wavelength shifting luminescent material which in use in the Cerenkov detector absorbs Cerenkov radiation and re-emits at a higher visible wavelength and in the case that the solid light transmitting material has a readily quenchable scintillation characteristic, a scintillation quencher. Preferred ranges are up to 0À25% or 0À025 to 0À0065% by wt. Detection may be by photocells. Examples include a base plastics of polymerized cyclohexylenethacrylate with 0À025% by wt. (bis-(p-isopropylstyryl) benzene) added to the monomer, the mix being heated preferably under vacuum, shaken to disperse, then heated at 90 to 120 to induce polymerization; (phenyl biphenylyl oxadiazole) and alkyl derivatives with the above base; polymerized isobutyl methacrylate base with about 0À25% or 0À025% by wt. (bis-(o-methyl styryl) bezene), polymerization being effected by tertiary butyl peroctrate catalyst with 60 and 75‹ C. heatings; polymerized isobutyl methacrylate with a 0À025% combination of perylene and tetraphenylbutadiene; polymerized vinyl toluene base with 0 025% bis-MSB and a small fraction of a per cent offurfuralazine benzalazine or anioalazine to quench bake material scintillations; equal proportion base copolymer of methyl methalcrylate and cyclohexylmethacrylate with 0À25% bis-MSB; polymerized methylmethacrylate with 0À0065% bis-MSB and polymerized cyclohexylmethacrylate with 0À16% diphenyl anthracene.