-
 

                                                      

: "" "". .

( 50 ):





(



. . .
( . Radium)

( . radix - )

( . radicula - )

(1926-94)
(1860-1900)
(1872-1935)
( . radio -
...



( . radio - activus - )




( )



( ... )










( ... ...)

( ... )




:





(Washington) ( . 1954)