Chapter 5 External Dose Calculations H-117 – Introductory ...
Chapter 5
External Dose Calculations
H-117 ? Introductory Health Physics
Slide 1
Objectives
? Understand how radiation is affected by distance from a point source
? Using the inverse square law, calculate dose rates
? Understand how the specific gamma ray constant is used
? Explain how each photon-emitting radionuclide has a unique gamma constant associated with it
H-117 ? Introductory Health Physics
Slide 2
Objectives
? Use the gamma constant correctly in an exposure calculation
? Calculate exposure and dose rates from gamma point sources
H-117 ? Introductory Health Physics
Slide 3
Time, Distance and Shielding
"Although exposure to ionizing radiation carries a risk, it is impossible to completely avoid exposure. Radiation has always been present in the environment and in our bodies. We can, however, avoid undue exposure through the following protection principles:"
H-117 ? Introductory Health Physics
Slide 4
Effect of Distance on Dose Rate
25 mrem/hr @ 6 ft 100 mrem/hr @ 3 ft
H-117 ? Introductory Health Physics
Slide 5
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