Development of physical and numerical techniques of Alanine/EPR dosimetry in radiotherapy

Investigation of radiation sensitivity of some tartrate compounds

Potential electron spin resonance (ESR) dosimetric application of different compounds of sodium tartrate, such as sodium tartrate dihydrate, sodium bitartrate monohydrate and potassium sodium tartrate tetrahydrate, was investigated in the range of 0.74-25 Gy. While the radiation-induced intermediates produced in these compounds are similar, their radiation yields are different. It is found that the radiation yield of sodium tartrate dihydrate is higher than other compounds of sodium tartrates. Comparison of the radiation yields were also made between well-known samples of ammonium tartrate, alanine and lithium formate. It is found that the radiation yields of sodium tartrate dihydrate, sodium bitartrate monohydrate and potassium sodium tartrate tetrahydrate have the values of 1.22, 0.18 and 0.13, respectively.

Dosimetric and kinetic investigations of γ-irradiated sodium tartrate dihydrate

Effects of gamma radiation on solid sodium tartrate dihydrate (NaTA) were studied using electron spin resonance (ESR) spectroscopy. One main singlet located at g = 2.0034 and many weak lines located at low and high magnetic field sides were found in the irradiated samples. Dosimetric and kinetic features of the radical species responsible for the experimental ESR spectra were explored through the variations in the signal intensities with respect to applied microwave power, temperature and storage time. Activation energies of the involved radical species were also determined using data derived from annealing studies.