Neutron Sensitivity of Prompt-Response Self-Powered Neutron Detectors and the Interval Rule

    Published: Jan 1989

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    This paper is devoted to the calculation of thermal sth and epithermal sepi sensitivities of cobalt prompt-response Self-Powered Neutron Detectors (SPNDs). The thermal sensitivity was obtained for a Maxwellian neutron field, and the effect of scattering on the self-shielding correction was taken into consideration in the second-collision approximation. The dependence of sth on the emitter radius R was studied in a wide region of R (0.025 to 0.2 cm). The differential and global epithermal sensitivities were calculated using a simple expression for the first-collision neutron absorption probability. Finally, a criterion to evaluate the accuracy of the parameters of the model was established in the form of some Interval Rule which is very sensitive to the radial dependence of the flux perturbation correction and other parameters of the model in both the thermal and epithermal regions.


    self-powered neutron detectors, thermal and epithermal sensitivities, cobalt, self-shielding correction, Interval Rule

    Author Information:

    Molina Avila, J
    LNETI - Institute of Nuclear Sciences and Engineering, Sacavem,

    Carmo Lopes, M
    LNETI - Institute of Nuclear Sciences and Engineering, Sacavem,

    Committee/Subcommittee: E10.05

    DOI: 10.1520/STP10134S

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