246 



ISOTOPIC TRACERS AND NUCLEAR RADIATIONS 



[Chap. 7 



Isotope 

 Z A 



81 AcC"2°7 



ThC" 208 



fj 209 



RaC"2i° 



82 Pb"" 



Pb200 



Pb 201 



Pb203 



Pb204 



Pt)204lT 



Pb 206 



Pb207 



Pb 208 

 Pb 209 



RaD2io 



Class 



A 



A 



D 

 B 



Per cent 

 abundance 



1.5 



23.6 

 22.6 

 52.3 



Type of 

 radiation 



P , 7 



/»". y 



K 



K 



K, e~, 7 

 I.T.(?) or 

 K(?)<r, 7 



I.T., 



7, e 



P . 7 



Half-life 



4.76 min 



3.1 min 



2.2 min 



1.32 min 



Energy of radiation, Mev 



Particles 



1-2 hr 



18 hr. 



8 hr; ~ 5 hr 

 52hr;54hr 



68 min; 

 65 min 



3.32 hr 



22 yr 



1.47 abs. Al 



1.72 spect.; 

 1.82 abs. 

 paper 



1.8 abs. Al 



1.80 cl.ch. 



0.70 abs.; 



0.68 



spect.; 



0.750; 



0.71 abs. 



Al; 0.70 



spect. 

 0.0255 



spect. ; 



0.0292 



7-rays 



2.62 



~ 0.45 abs. 

 of e~, abs. 

 Pb, spect., 

 spect. 

 conv., 

 0.27 spect. 

 conv., 

 abs. Pb 



1.1 abs. of 

 e~, abs. 

 Pb; 0.90 



No 7, no e 

 no 7 



0.047; 

 0.0472 



spect. 



Produced 

 by 



Pb-n-p 

 Natural 



source, 



AcC 2 '! 



a-decay 

 Natural 



source, 



ThC 212 



a-decay 

 Bi 2 " a-de- 

 cay, parent 



of Pb 20 ' 

 Natural 



source, 



RaO'i 



a-decay, 



parent of 



RaD 2 '° 



Bi>« K-de- 

 cay, par- 

 ent of Tl"» 



Bi 2 °o A'-de- 

 cay, par- 

 ent of Tl 2 °° 



Tl-rf-4« 



Tl-d-2n 



T\-p-n 



Pb-n-2n 



Pb™*-n-2n 



Pb-7-» 



Tl-d-n 



Tl-d-3n 



Pb-n-n 



Pb-x-rays 



Bi204 



A"-decay 



Pb-d-p 

 Pb-n-y 

 Bi-n-p 



p 213 



a-decay 



Natural 

 source, 

 RaC" 2 '° 



