Enhanced sensitivity of lithium dithionates doped with rhodium and nickel for EPR dosimetry.
Electron paramagnetic resonance (EPR) studies of X-irradiated lithium dithionate, Li(2)S(2)O(6) x 2H(2)O, doped with Ni and Rh have shown that these impurities enhance the yield of radicals formed by X-irradiation at room temperature. The signal in the doped samples, measured peak-to-peak of the single EPR derivative line attributed to the SO(3)(-) anion was about 3-4 times that of the pure lithium dithionate and more than 10 times stronger than the alanine signal. These impurities also shortened the spin-lattice relaxation time, T(1), which gives the possibility to measure the doped samples at a higher microwave power. This implies that sensitivity could be further enhanced in the already sensitive EPR dosimeter material lithium dithionate.
Gustafsson
H
H
Department of Medicine and Care, Radiation Physics, Faculty of Health Sciences, Linköping University, S-58185 Linköping, Sweden. hakgu@imv.liu.se
Danilczuk
M
M
Sastry
M D
MD
Lund
A
A
Lund
E
E
D004304:Dosage Forms; D004578:Electron Spin Resonance Spectroscopy / Q000379:methods; D007700:Kinetics; D008094:Lithium / Q000032:analysis* / Q000528:radiation effects; D008872:Microwaves; D009532:Nickel / Q000032:analysis*; D012238:Rhodium / Q000032:analysis*; D013871:Thiones
D004304:Dosage Forms; D013871:Thiones; D009532:Nickel; D008094:Lithium; D012238:Rhodium