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The yield ratio of Sc 44w /Sc 44 was measured in Sc 45 (a,an)Sc i4 reactions with helium ions of energies between 20 and 43 Mev and at 320 Mev. The measured ratio was nearly constant at a value of 1.5 between 20 and 43 Mev and was 0.62 at 320 Mev. The Sc 44m /Sc 44 ratio was measured in K 41 («,w)Sc 44 reactions at 10 and 43 Mev with values of 0.3 and 0.9, respectively. The isomer ratio was calculated for the K 41 (10-Mev a,n)Sc u reaction by means of a compound-nucleus model, and for the Sc 45 (320-Mev a,an)Sc u reaction by means of a classical knock-on model. The calculated ratios were 0.32 and 0.51, respectively.

A simple con du ctom etric t it ration m ethod is disc Ll ssed for the d etermination of sulfhydryl gro ups in nonionic polym er n etwork s, s Llch as disulfide a nd alkylene sulfide crosslinked polycaprolacta m fib ers. The diffu sion of the t itrant into t he crosslinked polymer is acco mplished ' by swelling t he ne twork struc t ure, thereby elimin ating the necessity of d estroying t h e crosslinks a nd /or brea kin g t he poly mer chains.

H5m and cd115 isomers produced i n 12-t o 340-Mev proton The Cd-bombardments of u~~~ were i s o l a t e d by radiochemical methods. The cumu-' 1 1 5 m l a t i v e y i e l d r a t i o s of cd115/cd were determined. I n t h e 45-Mev helium-ion f i s s i o n of uranium, an estimation of t h e independent-yield I r a t i o of h 148 (5.3-day) t o (43-day) w a s made. I n t h e deuteron f i s s i o n of uranium at about 20' Mev, an estimate of t h e independent-yield r a t i o of t o t h e t o t a l niobiumof mass 95 was made. A l i t e r a t u r e , , survey on experimental isomer ' r a t i o s from f i s s i o n was m a d e. 4 h 44 The y i e l d r a t i o of Sc /SC wasmeasured i n S~~~(a , a n) s c 44 r e a c t i o n s with helium ions of energies between 20 and 4.3 Mev and a t 320 41 Mev. The ~c~~/~c~~ r a t i o w a s msasured i n K (a , n)~c~~ r e a c t i o n s a t 10. and 113 Mev. 44m 44 The compound-nucleus model w a s used t o c a l c u l a t e t h e Sc /Sc r a t i o s produced by t h e r e a c t i o n s K41(10-Mev a,n)ScU and ~c~~ (a , m)~c 44 44 and ~c~~(~,~n) S c a t energies 0.4 Mev above threshold. Agreement between t h e experimental and c a l c u l a t e d Sc44m/Sc44 r a t i o was obtained 41 44 f o r t h e K (1 0-~e v a , n)~c r e a c t i o n .