C J Evans, S. J. S. Ryde, D. Hancock, F. A. M. AL‐AGEL,
Prompt gamma neutron activation analysis (PGNAA) is the most direct method of measuring total-body nitrogen. In combination with internal hydrogen standardisation, it is possible to reduce the dependence on body habitus. The uniformity of activation and detection, however, cannot be optimised sufficiently to eliminate the dependence entirely, and so further corrections are essential. The availability of the powerful Monte Carlo code MCNP(4A) has allowed a more accurate analysis of the activation ...
Tópico(s): Muscle metabolism and nutrition
1998 - Elsevier BV | Applied Radiation and Isotopes
S. J. S. Ryde, F. A. M. AL‐AGEL, C J Evans, D. Hancock,
A bstract : The use of a hydrogen internal standard to enable the estimation of absolute mass during measurement of total body nitrogen by in vivo neutron activation is an established technique. Central to the technique is a determination of the H prompt gamma ray counts arising from the subject. In practice, interference counts from other sources‐e.g., neutron shielding‐are included. This study reports use of the Monte Carlo computer code, MCNP‐4A, to investigate the interference counts arising from ...
Tópico(s): Nuclear Physics and Applications
2000 - Wiley | Annals of the New York Academy of Sciences