Electron spin resonance investigations on an electron-beam irradiated
solid state nuclear track detector, based on cellulose nitrate (KODAK
LR-311), are reported. The nature of free radicals induced in polymers
by irradiation is discussed. The dependence of resonance spectral par
ameters on irradiation times, as well as on storage time and temperatu
re, is studied. The experimental results are related to the stability
of latent tracks and it is concluded that the free radicals induced by
irradiation are located within the latent tracks. We have shown that
both latent track and free radical thermal fading obey an Arrhenius-li
ke dependence, with the same activation energy.