Study of photomultipliers radiation hardness

96-012 The radiation hardnesses of PM FEU-115 with the photocathode windows from glass SO96-1, dynode systems of alloyed type and PM windows of MgFz, radiation hard glass SO96-1, glasses SO96-1, SO50 are studied. No sizable changes were registered in the optical transmission of the photocathode SO96-1 window for the accumulated dose up to 35 Mrad, the PM FEU-115 output signals - up to 15 Mrad and the alloyed type dynode system amplification - up to 100 Mrad. In the same time SO95-2 and SO50 (the borosilicate type) glass windows lose the transparebcy in a few times under doses less than 1Mrad already.