Accession Number : ADD018111

Title :   Detection of Thermal Neutrons through the Use of Internal Wavelength Shifting Optical Fibers.

Descriptive Note : Patent, Filed 11 Jan 95, patented 21 May 96,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Copeland, Hugh D ; Losee, Jon R ; Mastny, Gary F

Report Date : 21 May 1996

Pagination or Media Count : 6

Abstract : An apparatus for detection of thermal neutrons includes a volume of gas which includes 3He. A wavelength shifting optical (WSO) fiber is disposed to receive ultraviolet (UV) photons generated by reactions between neutrons and 3He. UV photons are absorbed within the WSO fiber to produce longer wavelength fluorescence generated photons that propagate within the WSO fiber. A photodetector is disposed to receive fluorescence generated photons from at least one end of the optical fiber and provide an output signal corresponding to neutron detection.

Descriptors :   *FLUORESCENCE, *PATENTS, *NEUTRON DETECTORS, FIBER OPTICS, ULTRAVIOLET RADIATION, SHIFTING, HELIUM, PHOTODETECTORS, THERMAL NEUTRONS

Subject Categories : Nuclear Instrumentation

Distribution Statement : APPROVED FOR PUBLIC RELEASE