New results on radiation damage studies of plastic scintillators

Search for new scintillators for high-energy resolution electromagnetic calorimeters

“…7) for thin molded scintillator plates with h=1.1 mm is about t rec =1 day. The experimental data are close to the same characteristic for molded scintillator plates with h=3.÷ 3.8 mm [20,21]. Note that I o for thin plates does not practically recover in time after the irradiation.…”

“…times better level of the radiation resistance relative to similar levels for molded plates (about 1. Mrad) with h=3.÷3.8 mm [20,21]. Note that there is an opportunity of the further improvement of the radiation resistance to a level of D 2 ÷ 2.5 Mrad connected with the reduction of molded plates thickness to h=0.5÷0.4 mm.…”

“…It is obvious that in order to increase the light output of heavy scintillators, one should also use such primary additives that can be solved in the monomer with a concentration >5 %. Besides, the high concentration of some primary additives also improves the radiation resistance of plastic scintillators [15,20].…”

“…Taking into account the prolonged time (∼10 yr) of scintillators operation under the irradiation in EM-calorimeters, it is clear that the study of the samples relative light output I/I o just after the end of irradiation (in 20÷30 min) as well as in t rec =23 days of recovery in air [15,21,20] became an essential part of our radiation properties investigation. For thin scintillator plates with thickness h=1.1 mm, the relative light output from points in a range 2.5< l < 15 cm was measured.…”

Ion-induced degradation of BC-418 scintillation yield

“…In most cases, the deterioration of scintillating properties has been studied using electron or photon irradiation (Busjan et al, 1999;Hamada et al, 1999;Vasil'chenko et al, 1996;Holm et al, 1999). In a recent paper (Broggio et al, 2005) we have presented a simple experimental set-up for the study of the degradation of the scintillation yield under ion beam irradiation.…”