Experimental results are presented on the effects of X-ray radiation on superconducting samples of polycrystalline YBaCuO and BiSrCaCuO. The radiation effects are detected at 4.2K by changes of the mazation of the sample using a SQUID magnetometer. In the presence of ionizing radiation, the changes in magnetization correspond to release of trapped flux, fluxon destruction, and low frequency noise due to flux flow.
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