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Neutron fluence and dose measurements by optical fibers

: Henschel, H.; Köhn, O.; Metzger, S.; Decreton, M.; Devos, P.; Deparis, O.; Kirchhoff, J.; Grimm, S.

Vourvopoulos, G.:
Neutrons in research and industry. International conference
Bellingham/Wash.: SPIE, 1997 (SPIE proceedings series 2867)
ISBN: 0-8194-2263-0
International Conference Neutrons in Research and Industry <1996, Crete>
Conference Paper
Fraunhofer INT ()
Neutronen; Neutronenfluenz; neutron fluence; neutron dose; neutrons; Neutronendosis; Lichtwellenleiter; LWL; optical fibers; Dosimetrie; dosimetry

It is shown that fibers doped with (Ge + P) or with (GE + B) can be used with good accuracy for fluence determinations of fast or slow neutrons, respectively, when they are calibrated at sources of known flux. Calibration at easily available gamma sources, as well as fast neutron dose determination, are complicated by the facts that energetic recoil protons generated by fast neutrons in H-containing fiber coatings contribute to the dose in the fiber core, and that the highly ionizing secondary particles released by fast and slow neutrons will cause significantly lower light absorption than beta or gamma rays of the same dose.