TERMIUM Plus^®

Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 CONT

… neutron counters … can serve as monitors for the photoneutron background noise and permit an on-line measurement of the parasitic signal. Thus, a careful choice of the moderator thicknesses enables these detectors to collect a considerable proportion of the internal parasitic photoneutrons. A proportionality coefficient leads to knowledge of the background noise occurring in the useful delayed signal measuring unit. The thus measured parasitic signal can be subtracted from the useful signal during data processing. Measurements can also take place with a single series of detectors located in the inner moderator coating.  1, record 1, English, - photoneutron%20background%20noise

Record 1,  Textual support,  French

Record number: 1, Textual support number: 1 CONT

[…] l’énergie photonique optimale pour provoquer la réaction de photofission est aux alentours de 16 MeV [mégaélectron-volts], ce qui présuppose une énergie du faisceau d’électrons d’environ 20 MeV [mégaélectron-volts]. Malheureusement, à cette énergie d’électrons un bruit de fond neutronique commence à être généré. Ce bruit de fond provient de la réaction des photons sur l’isotope¹⁸0 qui donne naissance à des neutrons différés qui interfèrent avec le signal retardé de photofission.  1, record 1, French, - bruit%20de%20fond%20photoneutronique

Record 1,  Textual support,  Spanish

Record 2,  Textual support,  English

Record number: 2, Textual support number: 1 CONT

Pulsed neutron measurements for neutron lifetime and system multiplication and, through delayed neutron fraction and neutron lifetime, source jerk, rod drop, noise analysis, etc.  1, record 2, English, - rod%20drop

Record 2,  Textual support,  French

Record 2,  Textual support,  Spanish