Abstract
With SLOWPOKE and MNS reactors which have reproducible neutron fluxes, the standardization of multielement NAA can be reduced to measuring activation constants once for all elements and then determining relative detection efficiencies for new detectors and counting geometries. In this work, a method has been developed for the parameterization of the efficiency of gemanium detectors. The gamma-ray detection efficiency was measured as a function of energy and distance for three detectors. The variation with distance was found to follow a modified EID law, within 1%, for point sources 1 mm to 250 mm from the detector. A model, including coincidence summing corrections, was developed to calculate efficiency for NAA samples; it requires 16 measured parameters. Tests showed that the calculated relative detection efficiencies are accurate to better than 3% for close counting geometries and sample volumes up to a few millilitres. Areas of possible improvement to the accurarcy of the method are suggested.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
F. De Corte, A. Simonits, A. De Wispelaere, J. Hoste, J. Radional. Nucl. Chem., 113 (1987) 145.
F. De Corte, A. Simonits, F. Bellemans, M. C. Freitas, S. Jovanovic, B. Smodis, G. Erdtmann, H. Petri, A. De Wispelaere, J. Radioanal. Nucl. Chem., 169 (1993) 125.
L. Moens, J. De Donder, Lin Xilei, F. De Corte, A. De Wispelaere, A. Simonits, J. Hoste, Nucl. Instr. Meth., 187 (1981) 451.
D. E. Ryan, D. C. Stuart, A. Chattopadhyay, Anal. Chim. Acta, 100 (1978) 87.
C. Bergerioux, G. Kennerdy, L. Zikovsky, J. Radioanal. Chem., 50 (1979) 229.
G. Kennedy, J. St-Pierre, J. Radioanal. Nucl. Chem., 169 (1993) 471.
W. Tian, B. Ni, P. Wang, L. Peng, J. Radioanal. Nucl. Chem., 170 (1993) 27.
W. Tian, B. Ni, J. Radioanal. Nucl. Chem., 179 (1994) 119.
J. E. Cline, IEEE Transactions, NS-15, No. 3 (1968) 198.
R. Gunnink, J. B. Niday, Proc. ERDA Symposium on X- and Gamma-Ray Sources and Applications, Ann Arbor Science Publishers, Ann Arbor. Mich., 1979, p. 55.
C. M. Lederer, V. S. Shirley, E. Browne, J. M. Dairiki, R. E. Doebler, Table of Isotopes, 7th ed., John Wiley & Sons Inc., New York, 1978.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Kennedy, G., St-Pierre, J. Parameterization of detector efficiency for the standardization of NAa with stable low flux reactors. J Radioanal Nucl Chem 215, 235–239 (1997). https://doi.org/10.1007/BF02034470
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02034470