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Assumptions:
Cesium-137 Energy: 0.66 MeV
Gamma Factor for Cs-137: 3.3
Gamma Factor (filtered) for Ra-266: 8.25
Air Kerma Strength: 7.227uGy m2h-1 / mgRaEq10
Tolerance: 5%
Radiation Protection
The HVL in lead for Cesium-137 is 6.5 mm.
The TVL in lead for Cesium-137 is 21 mm (.827).
Physical Characteristics
Cesium-137 has a half-life of 30.0 years and decays with the emission of a monoenergetic gamma ray of 0.66 MeV.
To correct for physical decay of Cesium-137, the decay factors at selected years after the assay date are shown in the table below.
How Supplied
IPL Cesium-137 tube sources are packaged in a lead pig which is labeled to indicate the isotope, amount of activity, and calibration date. A calibration certificate and instructions for safe handling and use are also supplied.
Leak Testing
IPL Cesium-137 tube sources are leak tested prior to shipment and the results provided with shipping certification papers that accompany each shipment.
Licensing
The U.S. Nuclear Regulatory Commission has approved this sealed source(SSDR# CA0406S125S) for distribution to persons licensed to use by product material identified in §35.400 of 10 CFR Part 35, to persons who hold an equivalent licenser issued by an Agreement State, and outside the United States, to person authorized by the appropriate authority.
Federal law restricts this device for sale by or on the order of a physician. Please observe the Department of Transportation (DOT) regulations for hazardous material contained in Title 49, code of Federal Regulations (HMR;49CFR), transport and use of radioactive material.
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Decay Chart for Cesium-137
Half-Life 30.0 Years
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Years
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Decay Factor
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Years
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Decay Factor
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0.0
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1.00
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5.5
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0.88
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0.5
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0.99
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6.0
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0.87
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1.0
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0.98
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6.5
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0.86
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1.5
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0.97
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7.0
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0.85
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2.0
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0.95
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7.5
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0.84
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2.5
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0.94
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8.0
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0.83
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3.0
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0.93
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8.5
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0.82
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3.5
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0.92
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9.0
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0.81
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4.0
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0.91
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9.5
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0.80
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4.5
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0.90
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10.0
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0.79
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5.0
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0.89
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