is an internationally approved technique for the dose measurement
in various radiation fields.In the amino acid alanine irradiation
with ionizing radiation causes the production of radicals (unpaired
electrons), of which the number is proportional to the dose absorbed
over a wide dose range. The crystalline structure of the tissue
equivalent dosimeter material counteracts the recombination of
radicals. A fading of the signal generated in the alanine is only
observed at dose values above 3kGy and lies within the range of
a few percent per year.
The non-destructive readout of the radiation induced measuring
signal is performed by the procedure of electron spin resonance
(ESR). With careful adjustment of the ESR-spectrometer and by
using the appropriate dosimeters dose values within the range
from 2Gy to 200kGy can be determined (with an overall uncertainty
of 3.5 %, at confidence level of 95 %).
dosimeters are small, compact and easy to handle. They are characterized
by low influence of temperature, humidity and dose rate as well
as a wide measuring range, which makes them applicable for radiation
therapy, in blood components irradiators and in industrial irradiation
facilities. Because of its high quality and low costs the dosimetry
system can be utilized both for reference and routine dosimetry.