EPR Investigation of Radical-Production Cross Sections for Sucrose and L-alanine Irradiated with X-rays and Heavy-ions

Heavy-ion-induced sucrose radicals investigated using EPR and UV spectroscopy

“…In addition, the EPR signal areas for both sucrose and alanine exhibited a linear relation to the absorbed dose [ 21 ]. As was observed with the signal intensity, the slope of the line for alanine was ∼3.3 times greater than that of sucrose due to the difference in their molecular weights.…”

“…Generally, the yield ( Y ) due to ionizing particle irradiation can be empirically obtained using the radical-production cross-section. Thus, the radical production per particle was calculated using the radical-production cross-section: where Y is the yield due to the ionizing particle interaction, σ is the radical-production cross-section, N is the number of molecules per unit volume, t is the sample thickness, and Φ is the number of trajectories [ 21 ].…”

“…The σ values of sucrose for C- and Si-ion irradiation were 1.29 × 10 −12 ± 0.64 × 10 −12 μm 2 and 1.14 × 10 −12 ± 0.34 × 10 −12 μm 2 , respectively [ 21 ]. Considering the structural sizes of sucrose and alanine [ 28 ], the σ values for both of these molecules were approximately the same.…”

“…In addition to heavy-ion irradiation, X-rays (200 kV, 20 mA) were used. The dose rate was 1.23 Gy/min, and 0.5 mm copper and 0.5 mm aluminum were used to filter the low-energy radiation [ 21 – 23 ]. All the irradiated samples were maintained at ambient temperature for a few days prior to EPR measurements.…”

“…Spin concentrations were estimated using a calibration curve for known concentrations of TEMPO in benzene [ 21 ]. All the irradiation processes and analytical measurements were performed at ambient temperature.…”