This study compares two independently calibrated delayed-gamma neutron acti
vation (DGNA) facilities, one at the Brookhaven National Laboratory (BNL),
Upton, New York, and the other at the Children's Nutrition Research Center
(CNRC), Houston, Texas that measure total body calcium (TBCa). A set of BNL
phantoms was sent to CNRC for neutron activation analysis, and a set of CN
RC phantoms was measured at BNL. Both facilities showed high precision (< 2
%), and the results were in good agreement, within 5%.