The NP Series provides customers with the capability of detecting slow and fast neutrons and measurement of tissue equivalent dose rate of the neutron field. The detectors contain a proportional counter which produces pulses resulting from neutron interactions within it. The probes contain components which moderate and attenuate neutrons so that the net incident flux at the proportional counter is a thermal and low epithermal flux representative of the tissue equivalent dose rate and the neutron field. The neutron probe also contains a Circuit Card Assembly (CCA), Amplifier and Logic, and a CCA High Voltage supply. The NP Series of detectors are SMART probes, which retain probe information in non-volatile memory. When calibrated, data such as probe calibration constants and identifying information are stored and verified in the EEPROM memory in the probe circuitry. This arrangement allows the Canberra NP Series detectors to be interchangeable. The NP Series of detectors are maintenance free in design and require no routine servicing or preventive maintenance. The NP Series can be connected to multifunction control and display units such as ADM606, ADM606M, ADM616, and ADM616S. Designed to respond to thermal, epithermal and fast neutrons Measurement of tissue-equivalent dose rate of the neutron field SMART probe retains probe information in non-volatile memory > 3 He/BF > 3 proportional counter > 10 B attenuator Polyethylene moderator Excellent linearity and accuracy Detectors are easily interchanged. The NP Series detectors are designed and manufactured under a quality system in compliance with the following standards and requirements: ISO 9001 10CFR21 10CFR50, Appendix B > Principle of Operation IEEE-730 Due to the fact that neutrons have no charge, they can only be detected indirectly through nuclear reactions that create charged particles. TheNP100B detector uses ANSI/ASME NQA-1, ANSI/ ASME NQA-2, Part 2.7 > 10 B, whereas the NP100H uses > 3 He as the conversion target. The charged particle alpha or proton (respectively) created in the nuclear reaction ionizes the gas. The detector is housed in a polyethylene moderator with high hydrogen content. The hydrogen presents a large scattering section to the neutrons. Through elastic collisions with the hydrogen atoms the fast and epithermal neutrons give up a large part of their energy and are reduced to thermal neutrons. A cylindrical attenuator containing > 10 B isotope surrounds an innermoderator which contains the proportional counter.
Additional Prep Fees May Apply.
