title: Monte Carlo calculations of free ammonia production in deoxygenated solutions of glycylglycine irradiated by X rays and 60Co gamma rays.
abstract: Detailed-history Monte Carlo computer codes were used to simulate the formation, diffusion, and chemical reaction of free-radical species within deoxygenated aqueous solutions of glycylglycine irradiated by 250-kVp X rays and by 60Co gamma rays. In one reaction, hydrated electrons react with the glycylglycine solute to produce unbound, or free, ammonia. This reaction is complete by 10(-6) s within individual electron tracks for glycylglycine concentrations greater than or equal to 0.025 M. For solute concentrations from 0.025 to 1.2 M, calculated G values of free ammonia are in excellent agreement with measured values. In addition, the computer model predicts a statistically significant difference between the G value of free ammonia produced under X irradiation and that produced under 60Co gamma irradiation.
authors.affiliation: Department of Environmental Engineering Sciences, University of Florida, Gainesville 32611.
authors.forename: W E
authors.initials: WE
authors.lastname: Bolch
authors.forename: J E
authors.initials: JE
authors.lastname: Turner
authors.forename: H
authors.initials: H
authors.lastname: Yoshida
authors.forename: K B
authors.initials: KB
authors.lastname: Jacobson
authors.forename: H A
authors.initials: HA
authors.lastname: Wright
authors.forename: R N
authors.initials: RN
authors.lastname: Hamm
mesh_terms: D000641:Ammonia; D003198:Computer Simulation; D004151:Dipeptides / Q000528:radiation effects*; D005720:Gamma Rays; D006033:Glycylglycine / Q000528:radiation effects*; D009010:Monte Carlo Method; D011854:Radiochemistry; D014965:X-Rays
chemical_list: D004151:Dipeptides; D006033:Glycylglycine; D000641:Ammonia