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  • 1 University of Toronto Department of Physics M5S 1A7 Toronto Ontario Canada
  • 2 Toronto General Hospital M5G 1L7 Toronto Ontario Canada
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Calcium may be measured in vivo by neutron activation analysis /IVNAA/, observing the 3.1 MeV -ray from the decay of49Ca. Normally the detection of this -ray is done in a heavily shielded whole body counter. It is shown that the use of shielding is unnecessary. As a result, the cost of building an IVNAA facility for Ca is very much reduced.