s^■\■•ml■.sls OF ok(;.\\I(: conh'oinds n\ I()M/.i\(. kadia i ion 



Dr. Di .nc;an: 1 itiiuiiilx r Iwo years ago bciiitf told of the iJicparation of radio-active 

 material by the boinljardinenl of solids with radio-aetivc ions of very small energy 

 (less than 1 kcV). Could anyone tell mc if there have been any developments in this 

 type of radio-synthesis? 



Dr. (Jr.w: 1 do not know of that particular experiment. There were some experi- 

 ments something like them done by Essex, who tried to distinguish the effect of ions 

 and radicals producetl by an electronic beam by seeing whether he got reactions when 

 he drew the ions to the side. This was a good many years ago, and I have not seen 

 any more of that work. 



REFERENCES 



^CocKCROFT, Sir J. The Development of Radiation Chemistry and Radiochemistry : The 

 Royal Institute of Chemistry, London, 1954 

 ^CoLLiNSON, E. and Swallow^, A.J. Chem. Rev. 56 (1956) 471 



116 



