Abstract
A method for the measurement of the absolute intensity of neutron sources by a comparison with the neutron intensity from the reaction T(d, n)He4 is described. For the comparison of the intensities a detector was used which has an almost constant sensititity for a wide range of neutron energies. The detector consisted of a graphite prism in which, at a definite distance from the source (“constant”-sensitivity distance), the density of thermal neutrons was measured. The sensitivity of such a detector is constant, to an accuracy of 1–2 %, in the interval of neutron energies 0.1–8 Mev and is 13% lower for neutrons of energy 14 Mev. In 1953 this method was used for the measurement of the absolute intensity of a Ra-α-Be source with an accuracy of 4%.
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Additional information
We consider it a pleasant duty to express our gratitude to G. N. Flerov for valuable advice and a constant interest in the work, to D. V. Timoshuk for discussion of the result and to S N. Solov'ev for constant help during the experiments.
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Flerov, N.N., Taluzin, V.M. The measurement of the absolute intensity of neutron sources by a comparison with the reaction T(d, n)He4 . The Soviet Journal of Atomic Energy 3, 1095–1101 (1957). https://doi.org/10.1007/BF01507790
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DOI: https://doi.org/10.1007/BF01507790