Radiation Health Physics

Cardinal Principals of Radiation Protection Shielding Elsevier items and derived items © 2009 by Mosby, Inc., an affiliate of Elsevier Inc.

ALARA As Low Reasonably Achievable Elsevier items and derived items © 2009 by Mosby, Inc., an affiliate of Elsevier Inc.

Time Exposure = Exposure rate x Exposure time Elsevier items and derived items © 2009 by Mosby, Inc., an affiliate of Elsevier Inc.

Isoexposure lines during fluoro Distance Isoexposure lines during fluoro Elsevier items and derived items © 2009 by Mosby, Inc., an affiliate of Elsevier Inc.

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 Elsevier items and derived items © 2009 by Mosby, Inc., an affiliate of Elsevier Inc.

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 Elsevier items and derived items © 2009 by Mosby, Inc., an affiliate of Elsevier Inc.

Find the cardinal principals at work in this picture. Elsevier items and derived items © 2009 by Mosby, Inc., an affiliate of Elsevier Inc.

The End Elsevier items and derived items © 2009 by Mosby, Inc., an affiliate of Elsevier Inc.