? : a. VOICE: We'll speak now about the sempling problea, It has many. aspects, so we'll have three cr four speakers, The of these is Dr, Mitchell, who'll speak on Sr’°, I jast thought I would give ycu a few brief remarks the relationship of Sr’ and calctus-strontius metabo in humans as ve have put it together fcr purposes cf project, Sr” 4s the critical elenent involved in the texm hazard, primrily because cf its bone seeking pre Since ve know that bene is cne cf the least active of structures of the human body se far ap dynamic equilitri is ecncerned, we're able to state that these elenents are bone sesking tend to get into the bone and stay If we follow calciua or inert strontius cr also radium have figures vhich enable us to inlicate that after an uptake of the element that the material becomes and that after it becomes mineralised, ite rate cf from the bedy is quite slow, Whatever radicactive ns is present will exert its effects cver a long biological half-life, I think for most of cur considerations here have essentially considered strontiua 90 as being deposi in bone ani staying there, Calcits is a very Laportant element in the bedy, ani 99 percent of it gets into the tone, The cther 1 percent which is concerned with nervous re=acticns, ani varicus membrane reacticns, etc,» ve can ne for purposes of this preject, In crier to relate the “F t -? /18