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In Vivo Measurement of Body Nitrogen by Analysis of Prompt Gammas from Neutron Capture

Brookhaven National Laboratory, Upton, New York

Correspondence: For reprints contact: David Vartsky, Medical Research Ctr., Medical Dept., Brookhaven National Laboratory, Upton, NY 11973.

ABSTRACT

A method for the in vivo determination of body nitrogen by prompt gamma photons from neutron capture is described. An 85-Ci ²³⁸Pu-Be source provides the neutrons. The gamma detection system consists of two 15.24 x 15.24 cm Nal(TI) detectors placed above the patient. Absolute value of body nitrogen is determined using body hydrogen as an internal standard. The reproducibility of the method is ±3 % for a body dose of 26 mrem.

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