Radiation‐induced conductivity of polymers in different gases

The conductivity induced in various polymers by continuous irradiation with x rays was measured under a vacuum and in different gases. Oxygen, nitrogen, and air increased the induced conductivity in polyvinylidene fluoride (PVDF), while argon left it almost unchanged. Argon and air decreased it in Kapton, and air decreased it in Mylar. The saturation current is that stationary value of the current that is obtained if all radiation‐generated carriers are removed by the applied field. The measured current amplitude for PVDF in an atmosphere of air of 100% humidity reached almost 50% of that current, while in the other materials it did not exceed 1% of the saturation value. Therefore, carrier removal by the applied field played a negligible role in Kapton and Mylar.

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