Isotope-Specific Information

Ranges in air and tissues for the beta particle emitted by isotopes commonly used in KUMC Labs

Isotope

Maximum Beta Energy (keV)

Approximate Maximum Range In Air (cm)

Approximate Maximum Range in Tissue (cm)

H-3

18

0.5

0.006

C-14

156

22

0.03

S-35

167

24

0.03

P-33

249

56

0.06

Ca-45

257

58

0.06

P-32

1710

300

0.8

Rb-86

1775

310

0.9

Here are the half-lives for some common radioisotopes at KUMC:

Radioisotope

Half-Life

Radioisotope

Half-Life

Hydrogen-3

12.3 years

Sulfur-35

87.6 days

Carbon-14

5730 years

Calcium-45

162.7 days

Phosphorus-32

14.3 days

Iron-59

44.5 days

Phosphorus-33

25.3 days

Iodine-125

60.1 days

Last modified: Aug 21, 2014
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