, another reactor of similar design to the X-10 Graphite Reactor is still in operation, the Belgian BR-1 reactor of the SCK•CEN, located in Mol, Belgium. Financed through the Belgian uranium export tax, and built with the help of British experts, the 4 MW research reactor went critical for the first time on May 11, 1956. It is used for scientific purposes, such as neutron activation analysis, neutron physics experiments, calibration of nuclear measurement devices and the production of neutron transmutation doped silicon.