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We describe the design and generation of a microwave system in which liquid droplets of radioactive solutions are solidified during free fall. Upon passage through a vertically positioned H1lO resonant cavity, the droplets are heated within 0.25 sec to OOOC by 80 W of microwave power at 14 GHz. Major advantages of the microwave process over previous methods are (i) contact-free heating of the radioactive substance and (ii) no need for precipitation baths and/or washing solutions, which would became raddioactively contaminated.