X-Ray Induced Currents in Polyvinylidene Fluoride

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Abstract
The radiation-induced current J RIC during X-ray irradiation and the delayed radiation induced current J DRIC after cessation of irradiation were investigated in β-form polyvinylidene fluoride (PVDF). J RIC showed complicated transients and both J RIC and the dark current J d decreased with field in the high-field region. The TSC spectra in β-PVDF thermoelectrets and the discharging currents revealed the accumulation of hetero-space charge, which is closely related to the decrease of J d with the field. Thus the anomalous transients and field-dependences of J RIC could be qualitatively explained through the space charge. The temperature and X-ray-intensity dependences of J RIC and the temperature dependence of the time constants for the decay of J DRIC are also discussed on the basis of a simplified band model with a single set of electron traps.

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