In addition, the university also operates the McMaster Nuclear Reactor, used for nuclear science and engineering research since 1959. The university regularly acquires an operating license for the reactor from the Canadian Nuclear Safety Commission, with the latest 10-year license issued on 1 July 2014. The swimming pool reactor is used for research, educational, and commercial applications such as neutron radiography, and medical radioisotope production; including 60 per cent of the world's supply of iodine-125, an isotope used in nuclear medicine to treat prostate cancer. The production of molybdenum-99 has occasionally been moved to the university's reactor, when production at the National Research Universal reactor was temporarily halted.