A PARAFFIN-MODERATED 4$pi$-NEUTRON DETECTOR
A flat-response 4 pi -neutron detector was constructed by arranging BF/ sub 3/ counters in multiple concentric rings in a cylindrical paraffin moderator. The sensitivity is flat within plus or minus 5% for neutrons between 50 and 700 kev. The absolute efficiency is 2.24% for 50- to 700-kev neutrons and 1.78% for Pb/sup 210/-Be neutrons in the standard counter arrangement. This efficiency can be increased by mounting more BF/sub 3/ counters but the relation is not linear because of the mutual interference effect in BF/sub 3/ counters. The dependence of the counting efficiency on the angular distribution of neutron source was investignted by measurements of thermal neutron distributions in the moderator, and it has proved to be quite small (<1.5%) even for the T/sup 3/(p,n)He/sup 3/ reaction in its threshold region. (auth)
- Research Organization:
- Electrotechnical Lab., Tokyo
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-18-014237
- OSTI ID:
- 4079550
- Journal Information:
- Japan J. Appl. Phys., Journal Name: Japan J. Appl. Phys. Vol. Vol: 3
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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