1. Radiation Health Physics

2. Cardinal Principals of Radiation Protection
Shielding
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3. ALARA As Low Reasonably Achievable
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4. Time Exposure = Exposure rate x Exposure time
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5. Isoexposure lines during fluoro
Distance
Isoexposure lines during fluoro
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6. Shielding HVL TVL Tube Potential Lead (mm) Concrete (in) 40 kVp 0.03
0.13
0.06
0.40
60 kVp
0.11
0.25
0.34
0.87
80 kVp
0.19
0.42
0.64
1.4
100 kVp
0.24
0.60
0.80
2.0
125 kVp
0.27
0.76
0.90
2.5
150 kVp
0.28
0.86
0.95
2.8
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7. Weighting Factors Radiation Weighting Factors X -rays 1 Gamma rays
Neutrons
5-20
Protons 2
Alpha particles 20
Tissue Weighting Factors
Gonads
0.20
Bone marrow
0.12
Colon
Lung
Stomach
Liver
0.05
Breast
Thyroid
Skin
0.01
Effective Dose = abs dose x rad wtg factor x tissue wtg factor
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8. Find the cardinal principals at work in this picture.
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9. The End
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