THE DETERMINATION OF THERMAL NEUTRON DENSITY FROM THE ABSOLUTE MEASUREMENT OF THE ACTIVITY INDUCED IN GOLD FOILS (thesis)
The interaction of thermal neutrons with a coin shaped detector is discussed in terms of the reaction rate in an infinite sheet of pure absorber irradiated in a void by an isotropic, Maxwell distribution of thermal neutrons. A coincidence method for the evaluation of the decay rate of the neutron induced activity in gold is examined in detail and utilized to measure the relative specific activity of gold foils exposed to neutrons in the graphite thermal column of the Water Boiler Reactor. The relative specific activity was obtained for 3/4 and 1/4-in. diameter foils as a function of thickness for values of the thickness from 1.5 mg/cm/sup 2/ to a nominal thickness of 0.010 in. From the activity of the thinnest foils, the neutron density in the thermal column was obtained relative to the reactor power and the counting rate of a parallel plate fission chamber. (auth)
- Research Organization:
- Los Alamos Scientific Lab., N. Mex.
- DOE Contract Number:
- W-7405-ENG-36
- NSA Number:
- NSA-16-031056
- OSTI ID:
- 4779660
- Report Number(s):
- LADC-5381
- Country of Publication:
- United States
- Language:
- English
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