title: In vivo measurement of body nitrogen by analysis of prompt gammas from neutron capture.
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.
mesh_terms: D000328:Adult; D005069:Evaluation Studies as Topic; D005214:Fast Neutrons; D006801:Humans; D008297:Male; D009584:Nitrogen / Q000032:analysis*; D011829:Radiation Dosage; D013051:Spectrometry, Gamma / Q000295:instrumentation / Q000379:methods*
chemical_list: D009584:Nitrogen