Synthesis and TL characterization of Li[sub 2]B[sub 4]O[sub 7] doped with copper and manganese

Abstract

Abstract. Copper (Cu) and manganese (Mn) doped tissue equivalent Li 2 B 4 O 7 were prepared by solid state sintering. The glow curves shows a high temperature peak at 222 °C for Li 2 B 4 O 7 :Cu and for Li 2 B 4 O 7 :Mn at 218 °C. Linear dose response is observed up to 140 Gy. With a thermal treatment at 125 °C, the first peak of the phosphors doped with copper (95 °C) and manganese (90 °C) disappears and the main TL peaks remain isolated. The dose rate dependence was studied by exposing the samples at doses of 25 Gy and 250 Gy. At low dose it was observed that the Li 2 B 4 O 7 :Cu TL response has non-dependence on dose rate, and at higher dose was observed that there is a dependence of the TL response with the different dose rate until of 30%. For the case of Li 2 B 4 O 7 :Mn, the TL response has non-dependence on dose rate at low dose or high dose.

Properties of the HPHT diamond when used as a soft X-Ray detector

“…Nat. 41(159):168-173, abril-junio de 2017 doi: http://dx.doi.org/10.18257/raccefyn.457 A large number of materials with features luminescent have been studied recently Santiago, et al, 2011;Molina, et al, 2012;Guarneros, et al, 2013;Marcazzo, et al, 2015, with new techniques. Most of these materials tend to exhibit a sub-or over-response compared with the absorbed dose deposited in tissue, because these materials are not tissueequivalent (Te) (Zeff ≈ 7.4).…”