title: Use of aspartame-based sweetener tablets in emergency dosimetry using EPR.
abstract: Accident dosimetry aims to evaluate the unplanned radiation doses delivered to individuals through one of the objects exist in the area of the accident. The gamma dose response of free radicals generated in irradiated aspartame tablets and its usability for emergency dosimetry was studied. EPR spectra of unirradiated and irradiated aspartame-based sweetener were recorded. Two signals arise after irradiating, S(1) at g (S(1)) = 2.00229 +/- 0.00097 and S(2) at g (S(2)) = 2.00262 +/- 0.00088. Some EPR parameters were studied for radiation-induced radicals in aspartame sweeteners tablets, such as the microwave saturation behaviour, the effect of magnetic field modulation amplitude on the peak-to-peak height and peak-to-peak line width for both of S(1) and S(2). Responses of S(1) and S(2) to different radiation doses were studied and resulted in linear relationships, radicals persistence curves were plotted over a 49-d storage period. It was found that Aspartame sweeteners tablets are useful in the range from 0.96 to 39.96 Gy. Radiation-induced radicals possess reasonable stability.
authors.affiliation: Radiation Dosimetry Department, National Institute for Standards (NIS), Ministry of Scientific Research, Tersa St., Haram 12211, Giza, PO Box 136, Egypt. maghrabism@yahoo.com
authors.forename: A
authors.initials: A
authors.lastname: Maghraby
authors.forename: E
authors.initials: E
authors.lastname: Salama
mesh_terms: D001218:Aspartame / Q000032:analysis*; D004578:Electron Spin Resonance Spectroscopy / Q000379:methods*; D004632:Emergency Medical Services / Q000379:methods; D011829:Radiation Dosage; D011835:Radiation Protection / Q000379:methods*; D011868:Radioisotopes / Q000032:analysis*; D011874:Radiometry / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013549:Sweetening Agents / Q000032:analysis*
chemical_list: D011868:Radioisotopes; D013549:Sweetening Agents; D001218:Aspartame