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

Preliminary results are reported of measurements of radiation hardness of the plastic scintillating fiber Kuraray SCSF-81 against irradiation with fast neutrons and /sup 60/Co gamma -rays in the region of the neutron fluence from 1*10/sup 11/ to 5*10/sup 13/ n/cm/sup 2/ and the integrated gamma -ray dose from 80 to 10/sup 5/ Gy, respectively. Deterioration of both intrinsic light yield and light transmittance of the SCSF-81 is studied. Deterioration is observed at the neutron fluence of about 10/sup 12/ n/cm/sup 2/ and at the integrated dose of about 10/sup 3/ Gy for neutron and gamma -ray irradiation. Overall deterioration of the light yield is found to be about 40% for the neutron fluence of 10/sup 12/ n/cm/sup 2/ at the excitation distance of about 120 cm. It is found that the long component of the attenuation length deteriorates less than that of the short one.<
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