Please use this identifier to cite or link to this item: https://apo.ansto.gov.au/dspace/handle/10238/899
Title: A pulsed neutron measurement in BeO and derivation of the thermal neutron diffusion parameters from the λ (B2) curve
Authors: Ritchie, AIM
Keywords: Pulsed neutron techniques
Decay instability
Thermal neutrons
Experimental data
Issue Date: Nov-1967
Publisher: Australian Nuclear Science and Technology Organisation
Citation: Ritchie, A. I. M. (1967). A pulsed neutron measurement in BeO and derivation of the thermal neutron diffusion parameters from the λ (B2) curve. (AAEC/TM415). Lucas Heights, NSW: Australian Atomic Energy Commission.
Abstract: The decay constant of the neutron population was measured in BeO assemblies of various sizes. Particular attention was paid to the problem of 'room return', establishment of the asymptotic mode, and the appearance of the continuous mode of decay. The best fit to the λ(B2) curve gave λa = (1.954 > 0.076) x 10 2 sec -1 Do = (1.343 + 0.011) x 10 5 sec -1 cm 2 C = (4.88 + 0.31) x 10 5 sec - 1 cm 4, for BeO density 2.96 g cm -3 at a temperature of 22oC. The parameters can be used to derive L = 26.22 + 0.51 cm λtr = 1.619 + 0.013 cm. The parameterisation of the λ(B2) curve is discussed in conjunction with the problem of deciding when agreement exists between two separate measurements.
Gov't Doc #: 908
URI: http://apo.ansto.gov.au/dspace/handle/10238/899
Appears in Collections:Scientific and Technical Reports

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