Radiation hardness of plastic scintillating fiber against fast neutron and γ-ray irradiation

The authors report preliminary results of measurements of the radiation hardness of the plastic scintillating fiber Kuraray SCSF-81 against irradiation with fast neutrons and ⁶⁰Co γ-rays at neutron fluences from 1×10¹¹ to 5×10¹³ n/cm² and integrated γ-ray doses from 80 to 10⁵ Gy. Deterioration of light transmittance and light emittance was observed at a neutron fluence of about 10¹² n/cm² and an integrated dose of about 10³ Gy for neutron and γ-ray irradiation. It is found that the deterioration stops as the neutron fluence or the γ-ray dose increases, and the long component of the attenuation length deteriorates a little more slowly than the short one