546 



ISOTOPIC TRACERS AND NUCLEAR RADIATIONS [Chap. 29 



Table 47. Important Stable and Radioactive Isotopes That Have Been Used in 

 Biological and Medical Investigations: Nontraccr Studies — {Continued) 



gen and helium are being employed. None of these has been used clinically 

 as yet. 



By comparison with their therapeutic limitations, the use of radioactive 

 and stable isotopes in diagnosis is far more promising. There is probably no 

 clinical condition for which a useful application of an isotope might not be 

 worked out. It will not be surprising if in 25 years there are scores of stand- 

 ard diagnostic procedures employing isotopes of most of the elements of the 

 periodic system. 



