Dosimetry and application of the alanine-polymer film dosimeter

Alanine/ESR dosimetry has been developed mainly for reference and transfer dosimetry. The dosimetric properties of the alanine-polymer film dosimeter have been studied. It is found that the dose-response curves have very good linearity in double logarithm coordinates in the range 102-104 Gy for both 60Co γ-rays and electron beam, and a slight sublinearity in higher dose region. The dispersivity of the ESR signal amplitude is investigated and its standard deviation is ±1.2%. The effect of irradiation temperature on the ESR signal amplitude of the irradiated samples is studied. And the correction factor 0.0026 deg. C-1 is obtained for 800 Gy dose irradiated with 60Co γ-ray. The overall uncertainty of this dosimeter system is less than ±4.8% (2σ) at a dose of 800 Gy for 60Co γ-rays, and less than ±5% (2σ) at a dose of 1.8 kGy for 4 MeV electron beam. The dosimeters have been used for radiation processing at 3-5 MeV linear electron accelerator