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Ssay (NDA) technique for plutonium, called passive neutron multiplicity counting, has been developed as an extension of neutron coincidence counting (Ref. 1). The new technique has led to the design and fabrication of neutron multiplicity counters, one of which is pictured in Figure 6.1. The development of new neutron counters has been accompanied by advances in data-processing electronics, analysis algorithms, and data-analysis software. Development activities have been funded primarily by the.
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S2 FAQ
The neutron multiplicity is the average number of neutrons produced by fission of a particular nuclide, v. The multiplication factor is defined as the ratio of the neutron concentration in one generation to that of the preceding generation; the symbol k is used.
Typical fast neutron detectors are liquid scintillators, 4-He based noble gas detectors and plastic detectors. Fast neutron detectors differentiate themselves from one another by their 1.) capability of neutron/gamma discrimination (through pulse shape discrimination) and 2.) sensitivity.
Our best neutron detector for general use The TN15 high sensitivity thermal neutron detector utilizes a state-of-the-art silicon photomultiplier (SiPM) and offers world-leading specification in a compact form. The TN15 surpasses the performance of a 100mm long 13mm3 He tube at 4 atmospheres.
Neutrons have mass but no electrical charge. Because of this they cannot directly produce ionization in a detector, and therefore cannot be directly detected. This means that neutron detectors must rely upon a conversion process where an incident neutron interacts with a nucleus to produce a secondary charged particle.
In usual passive neutron coincidence counting (PNCC), this goal is achieved by recording coincidence pairs induced by spontaneous fission using 3He gas counters, which are very sensitive to thermalized neutrons but not to gamma rays up to a dose rate around 0.1 Gy.
Neutron multiplicity counting measures the frequency of neutron detection versus: • The number of neutrons detected (a.k.a., the “multiplicity” of the detection). The duration of the counting time (a.k.a., the “coincidence gate” width).
The most important active neutron detector types are gas-filled, scintillation, and semiconducting detectors and the most important passive neutron detector types are thermoluminescent, etched-track, and nuclear-emulsion detectors.
Helium-3 detectors identify neutrons based on the principle of absorption. The Helium-3 absorbs neutrons and emits high energy particles that are measured as a current and converted to neutron counts. Helium-3 detectors do not identify specific neutron sources.
252cf Related content
6. passive neutron multiplicity counting
A nondestructive assay (NDA) technique for plutonium, called passive neutron multiplicity...
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