Radioisotope Characteristics |
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Cobalt Co-60 |
Radium Ra-226 |
Cesium Ce-137 |
Iridum Ir-192 |
Thulium Tm-170 |
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|
Radiation Level RHF/Curie |
14.5 |
9.0 |
4.2 |
5.9 |
0.03 |
|
Energy (MEV) |
1.25 |
1.22 |
0.66 |
0.355 |
0.072 |
|
X-ray Equivalent (MEV) |
2 to 3 |
1 to 2 |
0.6 to 1.5 |
0.3 to 0.8 |
0.1 to 0.3 |
|
Penetration (STEEL) |
1 to 7 Inches |
1 to 5 Inches |
1 to 3 Inches |
1/4 to 3 Inches |
Very Thin to 1/2 Inch |
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Half-Life |
5.3 Years |
1600 Years |
30 Years |
75 Days |
130 Days |
|
Specific Activity |
Medium |
Very Low |
Low |
Very High |
Highest |
|
Half-Value Layer (Lead) |
0.50 Inches |
0.50 Inches |
0.30 Inches |
0.20 Inches |
0.05 Inches |
|
Tenth-Value Layer (Lead) |
1.62 Inches |
0.84 Inches |
0.64 Inches |
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Half-Value Layer (Steel) |
0.87 Inches |
0.68 Inches |
0.61 Inches |
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Tenth-Value Layer (Steel) |
2.90 Inches |
2.25 Inches |
2.0 Inches |
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|
Half-Value Layer (Concrete or Aluminum) |
2.60 Inches |
2.10 Inches |
1.90 Inches |
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Tenth-Value Layer (Concrete or Aluminum) |
8.60 Inches |
7.10 Inches |
6.20 Inches |
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Cost |
Low |
High to Buy Low to Rent |
Medium |
Relatively Low |
High |
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Other |
Readily Available |
Radon Gas is Actual Source |
Requires Double Encapsulation |
Readily Available |
Not Readily Available |