Fading characteristics of irradiated alanine pellets: The importance of pre-irradiation conditioning

Evaluation of some parameters which influence the ESR measurements for the fading study of alanine dosimeters

“…The humidity rate after irradiation takes part in the hump phenomenon before the first day of measurement. But its main action, already ob -s e r v e d [ 4 ] , r e v e a l e d i t s e l f w i t h t i m e a c c o r d i n g t o i t s v a l u e . I f t h e h u m i d i t y r a t e after irradiation is set to 60%, one observes a decrease of the amplitude of about 5% for doses of 5 and 10 kGy, of 20% for doses of 1 kGy in a way almost independent of the storage conditions before irradiation.…”

“…The influence of the humidity rate before and after irradiation has been evoked since a long time [1,4], water is probably the main cause of the recombination of free radicals. In order to understand the influence of water on the stability of the free radicals of alanine, i.e., the role of water in the mechanisms of recombination, we have chosen to control four humidity degrees before and after irradiation: 0, 20, 40, 60%, temperature being maintained by air conditioning to room temperature (about 20°C) [5].…”

Medical reference dosimetry using EPR measurements of alanine: Development of an improved method for clinical dose levels.

“…Contrary to TLD dosimeters the readout of alanine is non-destructive and coupled with a low fading in the order of 1% per year [24] it is possible to re-measure alanine dosimeters at any given time. The ability to retain the intact dosimeter for documentation makes alanine dosimetry ideal for quality assurance, e.g.…”

A new EPR dosimeter based on sulfanilic acid

“…Knowledge of time stability of the EPR signal intensity under different storage conditions after irradiation is of great importance from the dosimetric applications point of view (Arber and Sharpe, 1993;Nagy and Desrosiers, 1996;Bartolotta et al, 2001). Fig.…”