INAA application in the age dynamics assessment of major, minor, and traceelements in the human rib

The Ca, Cl, K, Mg, Na, P, and Sr concentration of rib-bone was studied of 7 8 relatively healthy 15-55 years old women and men using instrumental neutr on activation analysis. A tendency for Ca, P, and Mg concentrations to decr ease with age was found in subjects over 35 which was manifested more disti nctively in women. It was shown that higher volumes of density, Ca and P co ncentrations as well as lower K, Cl, and H2O contents were typical of femal e ribs being compared to those in male ribs. The average annual losses of t he rib Ca in the Russian women over 25 were estimated to be 0.7% of the con centration peak level. They agree well with data available for citizens of the USA and Germany.