3J^2 TECHNETIUM 



Technetium 99 (2.12 X 10^ yr) Beta 0.30 Gamma 



Cat No Sp Act. Form Cost Chem. Cont. Radiochem. Cant. 



Tc-99-l' CF FromMoOs $33/0.005mc Mo 33 mc Mo^M2.85 days) 



Tc-99-P CF NH4TCO4 $20/20 juc — 



Critical Org. 

 Kidney 



Intake Levels. Technetium is the name proposed for element 43, 

 radioisotopes of which were identified in fission material. The natural 

 occurrence of this element is questionable, and it has been of httle or no 



biological interest. , , ■ 



Radioassay. Preparation Tc-99-P appears to be the one of choice on 

 the basis of cost and freedom from radiocontamination. The Mo^^ con- 

 tamination of Tc-99-I can be eliminated by decay. Soft-beta-countmg 

 techniques will be required, and self-absorption will be an important 



Chemistry. Technetium, being chemically similar to rhenium, may 

 be distilled from H.SO4 solution, and therefore wet-ashnig must be 

 employed with caution. Presumably dry-ashing may be satisfactory. 

 Reference (Tc-1) presents details in regard to separation of technetium 

 from the fission-product mixture. 



Tc-l Coryell, Charles D., and Nathan Sugarman: "Radiochemical Studies: The 

 ■ Fission Products," Books 1-3, National Nuclear Energy Series, McGraw-Hill 

 Book Company, Inc., New York, 1951. 



