A reactimeter is a diagnostic device used in nuclear power plants (and other nuclear applications) for measuring the reactivity of the nuclear chain reaction (in inhours) of fissile materials as they approach criticality.1
References
References
- G., Chauvet; R., Gariod; E., Tournier (1966). "Réactimètre" [Reactimeter]. Nuclear Electronics Conference Proceedings (in French) (1966). Vienna: International Atomic Energy Agency: 365–378 – via International Nuclear Information System.