A pulsed neutron measurement in BeO and derivation of the thermal neutron diffusion parameters from the λ (B2) curve
Loading...
Date
1967-11
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Australian Nuclear Science and Technology Organisation
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.
Description
Keywords
Pulsed neutron techniques, Decay instability, Thermal neutrons, Experimental data
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.