Abstract
Abstract Different (n,a) converter materials placed in contact with cellulose nitrate detectors were tested as thermal neutron detectors. A plastic sheet doped with 1% boron, a solidified boron oxide plate, a single crystal plate of boron oxide and a single crystal plate of lithium fluoride were used as converter materials. After thermal neutron irradiation in the low power research reactor of the Institute, the cellulose nitrate detectors were etched in alkaline solution. The etched holes on the films were counted with a spark counter. The single crystal of lithium fluoride was found to be the most sensitive converter for the detection of thermal neutrons. A linear relation was observed between thermal neutron fluence and spark counts in the range 106 to 107 n.cm-2. A method of producing the single crystal converter is also described.
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