recently t h a t the B r 7 9 (n, ) (1) P. C. Capron and E. Crevecoeur, J. Chem. Phys.,& 1843 (1953 Breom(4.4 hr.) process gives higher organic yieldsD i n propyl bro-( 2 ) The organic yield" i s the f r a c t i o n of the (n, \d) events which lead t o organically bound radiobromine. mides, bromobenzenea and brornof orm4 than the ~r '~ (n, \/ )E3re0 (18 min. ) .1 -( 3 ) P. C. Capron and E. Crevecoeur, J. Chim. Phys, 44, 29 (1952). (4) P. C. Capron and Y. Oshima, J. Chem. Phys,20, 1403 (1952).

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... cess, when c o m e r c i a l reagents a r e used without f u r t h e r purifioation. They have reasoned t h a t impure reagents should give isomer e f f e c t s s i m i l a r t o pure organic compounds even though the absolute values of the organic y i e l d s a r e d i f f e r e n t . Fox and ~i b b~' and * b 5 M. 5 . Fox and W. F. Libby, J. Chem. Phys., a 487 (1952). )+. -I Rowland and Libby6 have reported, however, t h a t the organic y i e l d s ( 6 ) F.