41. The results showed that, with a lightly enriched uranium, criticality could be reached. 42. It was France's first fast reactor, and first achieved criticality in 1967. 43. He inadvertently helped the nuclear scientists criticality . 44. She was interested in the subjects of criticality safety and Radiological Protection-Health Physics. 45. Another very low power reactor achieved criticality in 1958 and as of 2002 was operational. 46. Large amounts of absorbers are used to control or reduce the probability of a criticality . 47. The heating of the core and shells stopped the criticality within seconds of its initiation, 48. Improved cross-section measurements allowed Christy to refine his criticality estimate to 575 grams. 49. The nuclear version of spontaneous combustion is known as a " criticality accident ." 50. As recently as 1991, conditions conducive to criticality occurred at a plant in North Carolina.
