RUTHENIUM 



291 



Ruthenium 97 (2.8 days) 



Cat. No. 

 Ru-97-I 



Sp. Act. 

 0.03 mc/g 



Form 

 Ru03 



Cost 

 $41/0.1 mc 



Beta Gamitia 0.22 A' 



Chem. Cont. Radiochon. Cont. 

 — 0.003 nu- Tc9"» (90 days) 



7 mc llu'«' (39.8 days) 

 26 mc Rh'os (30.5 hr) 



Rf/mc 

 1.4 



Critical Org. 

 Kidney 



Ruthenium 103 (39.8 days) 



Cat. No. 

 Ru-103-P 



Mica W. 

 4 X 10-^ 



Critical Org. 

 Kidney 



Sp. Act. 

 CF 



Int. C. 

 2.1 X 10-5 



Form 

 Chloride 



Cod 



$5/mc 



Scint. C. 

 7.5 X 10-" 



Beta 0.222, 0.684 Gomma 0.494 



Chem. Cont. 



R//mc 

 3 



Radinchem. Cont. 

 <\0% Ru'06.Rh>06 



50 % Self-abs. 

 13 



Ruthenium 106 (1.0 yr) 

 Rhodium 106 (30 sec) 



Cat. No. 

 RuRh-106-P 



Mica W. 

 9.8 X 10-5 



Critical Org. 

 Kidney 



Sp. Act. 



>2c/g 



Int. C. 

 7.3 X 10-5 



Body 

 4 fic 



Form 

 Chloride 



Cost 

 $10/mc 



Scint. C. 

 1.4 X 10-3 



Air 

 3 X 10-8 



Gamma 



Gamma 0.51-2.23 



Beta 0.041 

 Beta 3.55, 2.30 



Chem. Cont. Radiochem. Cont. 

 — < 1 0^' Ru 103 (39.8 days) 



Rh'°« daughter (30 sec) 



Rf/mc 50 % Self-abs. 



1.3 670 (calc.) 



Water 

 0.1 



19 days 



Intake Levels. Little is known of the naturally occurring levels of 

 ruthenium in biological material. The metaboHsm of this element has 

 been of interest primaril}^ because it is a fission product. Survey experi- 

 ments indicated that mice should receive less than 3 mg/kg, injected into 

 the heart, to avoid chemical toxic effects (Ru-1). 



Radioassay. The Ru'^^-Rh^^^ preparation is perhaps the best, 

 although the Ru^°^ does not present too manj^ difficulties from radio- 

 contamination. The Rh''^*^ daughter is so short-lived that the samples will 

 have to stand for only about 5 min for equilibrium to be reached. Thus 

 the energetic Rh^"^ radiations may be readily measured by either hard- 

 beta or gamma methods and will indicate the amount of Ru'°^ present in 

 the sample. 



Chemistry. Ruthenium may exist in nine valence states from to 8, 

 and although the melting point of the metal is high, many of its com- 

 pounds are quite volatile. Losses occurred when tissue samples were dry- 



