Actinium and Thorium Emanation. 



Table III. — Actinium Emanation in Air. 

 Variation of Diffusion Coefficient with Pressure. 



419 





Dist;mc(i 

 in cms. 



I '4 cms.IIg. 



Log. of 

 Activity. 



41 cms. 



Log. of 

 Activity. 



8-0 cms. 



Log. of 

 Activity. 



15'5 cms. 



Log. of 

 Activity. 



37-J cms. 



Log. of 

 Activity. 



55'8cms. 76-4cms. 



Log. of Log. of 

 Activity. Activity. 



•46 



1-618 



1-601 

 1-564 



1-797 

 1-744 

 L-689 

 1-646 

 L-596 

 1-523 

 1-477 

 1-421 

 1-380 

 1-316 

 1-268 



1-850 

 1-759 

 1-704 

 1-625 

 1-548 

 1 -469 

 1-391 

 1-313 

 1 -232 

 1-147 

 1071 



1-254 

 1-157 

 1-074 

 •946 

 •829 

 •712 

 •611 

 •528 

 •374 

 •298 



1-518 

 1-367 

 1-230 

 1044 



2-246 

 2057 

 1-860 

 MUM) 



2-609 

 2-380 

 2-153 

 1-885 

 J -682 



•92 



1-37 



1-83 



1-548 



2-28 



1-509 

 1-485 

 1-445 

 1-425 

 1-389 

 1-375 



•909 1-434 



2-72 



•745 1-286 



1 -438 



3-17 



•539 1024 11 63 

 •428 ! -829 1-014 

 •204 1 -734 -784 

 •020 



3-63 



4-09.... 



4-55 



501 





Diff. coeff. K 7-81 237 

 Pressure XK 100 9 7 



1-16 



•582 

 90 



•248 



•167 



9-3 



125 

 9-5 



Mean value P X K 



— > I -If. &mx> Ha 



r-» ly/ emu) 



8-Oomd 



15-5 (wit 



I % S 4 S 



'itcrnetrcj 



