Oscillating monitor for fissile material
阅读：112发布：2021-05-19
专利汇可以提供Oscillating monitor for fissile material专利检索，专利查询，专利分析的服务。并且A device for monitoring fissile material has a neutron source that oscillates between a location near and a location remote from a neutron detector. The detector is adjacent to suspected fissile material and is shielded by hydrogenous material from the remote location. The detector output is transmitted to analytical instrumentation for determining prompt and delayed neutron count or the phase angle lag between measured neutron flux and the source oscillation. From these determinations, the reactivity of fissile fuel and the concentration of fissile material in deeply subcritical storage facilities can be obtained.，下面是Oscillating monitor for fissile material专利的具体信息内容。
1. A device for monitoring fissile material comprising: a. an isotopic neutron source b. a neutron detector disposed adjacent to said fissile material c. oscillatory means for moving said neutron source between a location proximate to said neutron detector and a location remote from said neutron detector.
2. The device of claim 1 wherein there is included counting means for separately registering the output of said neutron detector when said neutron source is proximate to said detector and when said neutron source is remote from said detector.
3. The device of claim 1 wherein said oscillatory means comprises a reciprocative motor linked to said neutron source for repetitively positioning said neutron source in said proximate location for a first time interval and then in said remote location for a second time Interval to produce an approximate square wave neutron flux variation at said detector.
4. The device of claim 3 wherein said reciprocative motor comprises an elongated cylinder having an axial shuttle bearing said neutron source and hydraulic means for reciprocating said shuttle between the ends of said cylinder; said cylinder being fixedly attached at one end thereof proximate to said neutron detector; and movable means are included for relocating said cylinder and neutron detector in respect to said fissile material.
5. The device of claim 1 wherein said neutron detector and said oscillatory means are disposed at oppositely facing surfaces of said fissile material.
6. The device of claim 1 wherein liquid hydrogenous material is disposed between said proximate and remote locations and said remote location is at a distance of about 30 to 100 centimeters from said proximate location.
7. The device of claim 1 wherein said oscillatory means comprises a rotatable member having said neutron source affixed to a distal portion thereon, and a rotary motor for continuously revolving said neutron source through said proximate and remote locations to produce an approximate sinusoidal neutron flux variation at said detector.
8. A method of monitoring fissile material comprising: a. disposing a neutron detector adjacent to said fissile material; b. oscillating a neutron source between a location proximate to said neutron detector and a location remote from said neutron detector to produce a cyclic neutron flux; and c. sensing said cyclic neutron flux with said neutron detector.
9. The method of claim 8 wherein the reactivity of said fissile material is monitored by: a. reciprocating said neutron source between said proximate and remote locations in respect to said neutron detector; b. delaying said neutron source in said proximate location for a first time interval and in said remote location for a second time interval; c. separately registering the output of said neutron detector during said first and during said second time intervals; and d. determining the ratio of total prompt neutrons to total delayed neutrons and the reactivity of said fissile material from the output of said neutron detector during said first and said second time intervals.
10. The method of claim 8 wherein the relative concentration of said fissile material in different regions of a mass containing said fissile material is monitored by: a. positioning said neutron source and neutron detector in a first region; b. reciprocating said neutron source between said proximate and remote locations in respect to said neutron detector; c. delaying said neutron source in said proximate location for a first time interval and in said remote location for a second time interval; d. registering the output of said neutron detector during said second time interval; e. moving said neutron detector and neutron source to a second region and repeating steps (b)-(d); and f. comparing the output of said neutron detector during said second time interval in said first region with the corresponding output in said second region.
11. The method of claim 8 wherein the reactivity of said fissile material is monitored by: a. continuously oscillating said neutron source between said proximate and remote location in respect to both said neutron detector and said fissile material to produce a sinusoidal neutron flux at said detector; b. monitoring the oscillation of said neutron source to produce a reference signal; and c. comparing the wave form phase of said neutron flux with the wave form phase of said reference signal to determine the phase angle lag and the reactivity of said system.
12. The method of claim 11 wherein said step of continuously oscillating said neutron source is accomplished by rotating said source through said proximate and remote locations at a frequency that produces a phase angle lag of about 45*.
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