Physics Bucharest 2017

Types of sources

Yield (Ci per mg)

 -ray energies

Source

Form

Half life

Production

Naturally occurring

Ra 226

1620yr

0.86 MeV

Cylindrical

Fission product

Cylindrical or spherical

0.0865

Cs 137

30yr

0.66MeV

1.13

n, 

Co 60

5.26yr

1.17,1.34MeV

Cylindrical

2.5mm grains 14 in magazine

243.9

n, 

Au 198

2.7 days

~0.4 MeV

Many  ’ s about 0.3MeV

Wire, pins, hairpins

9.17

n, 

Ir 192

74 days

4.5mm seeds graphite pellets with radiographic marker

n, 

Pd 103

17 days

21 keV effective

Decay product of Xe 125

I 125

59.6 days

27.4,35.3 keV

4.5mm seeds