Abstract
A YBa/sub 2/Cu/sub 3/O/sub 7-x/ ceramic was sequentially irradiated with /sup 60/Co /spl gamma/-rays of 155.4 R/min in dose rate; up to the dose 5000 Gy at ambient temperature, AC susceptibility and magnetization were measured as a function of temperature and magnetic field, respectively. The transition to the superconducting state has decreased roughly linearly with radiation dose at a rate of 6.2*10/sup -4/ K/Gy probably as a consequence of the change of carrier concentration in CuO/sub 2/ planes. The intragrain critical current density has increased for lower and higher radiation doses. Formation of the extra centres of pinning by /spl gamma/ irradiation is suggested.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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