Abstract
A modified method of determining the effective delayed-neutron dose is proposed. The method is based on a combination of determining the pseudoreactivity of the 252Cf source and measuring the α-Rossi time distribution. The advantage of the method proposed here is that there is no need to measure the absolute rate of fissioning of the nuclei in the medium. It is proposed that the latter be expressed in terms of the intensity of a known source of spontaneous fissions of 252Cf nuclei. The measurements are performed on an assembly with a hydrogen-containing moderator. The influence of the positions of the detectors (3He counters) on the measured effective delayed-neutron fraction is studied.
Similar content being viewed by others
References
V. A. Dulin and V. V. Dulin, “Measurements of subcritical states of multiplying media,” At. Énerg., 86, No. 3, 99–103 (1999).
P. Bertrand, S. P. Belov, V. A. Doulin, et al., “BERENICE-interlaboratory comparison of βef measurement techniques at MASURCA,” in: Proceedings of International Conference on the Physics of Reactors PYSOR-96, Mito, Japan, September 16–20, 1996, Vol. 2, pp. 190–230.
V. A. Dulin, I. P. Matveenko, and G. M. Mikhailov, “Application of the model of two groups of prompt neutrons for analyzing measurements of the effective fraction of delayed neutrons by the α-Rossi method,” At. Énerg., 80, No. 1, 61–66 (1996).
V. A. Doulin, G. M. Mikhailov, and A. L. Kochetkov, “International benchmark experiment of effective delayed neutron fraction in the fast critical facility, FCA, JAERI,” in: Progress in Nuclear Energy, 35, No. 2, 163–169 (1999).
R. Urig, Statistical Methods in the Physics of Nuclear Reactors, Atomizdat, Moscow (1974), pp. 35–40.
V. A. Dulin and G. M. Mikhailov, “Measurement of the effective fraction of delayed neutrons by the α-Rossi method,” At. Énerg., 78, No. 3, 151–155 (1995).
A. T. Bakov, A. P. Bondarev, A. V. Grachev, et al., “Digital reactimeter based on the Élektronika 60 microcomputer,” Preprint FÉI-1439 (1983).
V. A. Dulin, “Assessment of experiments on perturbation of reactor criticality,” At. Énerg., 66, No. 2, 79–81 (1989).
G. Kistner, “Rossi-α theory for assemblies with two prompt neutron groups,” Nukleonik, 7, No. 2, 106–108 (1964).
V. A. Dulin and G. D. Spriggs, “Measurement of βeff by the α-Rossi method in a reactor with a reflector,” At. Énerg., 82, No. 1 66–68 (1997).
V. A. Dulin and R. E. Sauranbaev, “Analysis of the temporal behavior of prompt neutrons in a critical assembly with nonuniformities in the reflector,” Izv. Vyssh. Ucheb. Zaved. Yad. Énerget., No. 1, 35–40 (1996).
Author information
Authors and Affiliations
Additional information
__________
Translated from Atomnaya Énergiya, Vol. 100, No. 5, pp. 393–399, May, 2006.
Rights and permissions
About this article
Cite this article
Dulin, V.A. Measurement of the effective delayed-neutron dose by the α-Rossi method in water-containing media. At Energy 100, 370–375 (2006). https://doi.org/10.1007/s10512-006-0096-2
Received:
Issue Date:
DOI: https://doi.org/10.1007/s10512-006-0096-2