Occupational Intakes of Radionuclides Part 1 - ICRP
Occupational Intakes of Radionuclides Part 1 - ICRP
Occupational Intakes of Radionuclides Part 1 - ICRP
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2630<br />
2631<br />
2632<br />
2633<br />
2634<br />
2635<br />
Uranium-235*<br />
a<br />
Thorium-231<br />
700 million years<br />
b<br />
Protactinium-231*<br />
26 hours<br />
a 33,000 years<br />
Actinium-227<br />
a<br />
22 years<br />
(1%)<br />
Francium-223*<br />
b<br />
22 years<br />
(99%)<br />
Thorium-227*<br />
a<br />
b a<br />
22 minutes<br />
Radium-223*<br />
Radon-219*<br />
a<br />
Polonium-215<br />
a<br />
Lead-211*<br />
DRAFT REPORT FOR CONSULTATION<br />
19 days<br />
11 days<br />
4.0 seconds<br />
1.8 milliseconds<br />
b<br />
Notes:<br />
The symbols a and b indicate alpha and beta<br />
decay, and the times shown are half-lives.<br />
An asterisk indicates that the isotope is also<br />
a significant gamma emitter.<br />
75<br />
Bismuth-211*<br />
a<br />
36 minutes<br />
Thallium-207<br />
2.1 minutes<br />
Figure 11 Natural decay series: Uranium-235<br />
b<br />
Lead-207 (stable)<br />
4.8 minutes
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