1401 / 1542
Types of sources
27.4,35.3 keV
59.6 days
Decay product
of Xe
125
4.5mm seeds
I
125
21 keV effective
17 days
n,
4.5mm seeds
graphite pellets
with radiographic
marker
Pd
103
9.17
Many
’
s about
0.3MeV
74 days
n,
Wire, pins,
hairpins
Ir
192
243.9
~0.4 MeV
2.7 days
n,
2.5mm grains
14 in magazine
Au
198
1.13
1.17,1.34MeV
5.26yr
n,
Cylindrical
Co
60
0.0865
0.66MeV
30yr
Fission
product
Cylindrical or
spherical
Cs
137
0.86 MeV
1620yr
Naturally
occurring
Cylindrical
Ra
226
Yield
(Ci per mg)
-ray energies
Half life
Production
Form
Source