Chapter 5 External Dose Calculations H-117 – Introductory ...
嚜澧hapter 5
External Dose
Calculations
H-117 每 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
U
d t d how
h
the
th specific
ifi gamma ray constant
t t is
i
used
?
Explain how each photon-emitting radionuclide has
a unique gamma constant associated with it
H-117 每 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 每 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 每 Introductory Health Physics
Slide 4
Effect of Distance on Dose Rate
25 mrem/hr @ 6 ft
H-117 每 Introductory Health Physics
100 mrem/hr @ 3 ft
Slide 5
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