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Slowing Down Spectrum and Neutron Temperature in a Thermal Neutron Flux Density Standard

K W Geiger and L van der Zwan

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Epithermal and thermal flux parameters for the thermal flux density standard at the National Research Council have been measured to allow a more accurate calculation of activation rates. The epithermal spectrum is found to follow a E-0.95 law, where E is the neutron energy. The effective neutron temperature in the irradiation cavity is found to be 42 °C which is 22 °C higher than the moderator temperature. A formula to calculate the reaction rate is given.


PACS

29.40.-n Radiation detectors

06.20.Fn Units and standards

28.20.Gd Neutron transport: diffusion and moderation

Subjects

Accelerators, beams and electromagnetism

Nuclear physics

Instrumentation and measurement

Particle physics and field theory

Dates

Issue 1 (January 1966)

Received 17 September 1965



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