Apply Photon Interaction Principles
ARRT Radiography Exam · Flashcards · Application
ARRT RADIOGRAPHY EXAM · FLASHCARDS
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QUESTION
Using
I
=
I
0
(
1
2
)
n
I=I_0(\frac{1}{2})^n
I
=
I
0
(
2
1
)
n
, what fraction of
I
0
I_0
I
0
remains after
n
=
3
n=3
n
=
3
HVLs?
QUESTION
If a beam passes through
2
2
2
HVLs, what percent of the original intensity remains at the detector?
QUESTION
Using
I
=
I
0
(
1
2
)
n
I=I_0(\frac{1}{2})^n
I
=
I
0
(
2
1
)
n
, what fraction of
I
0
I_0
I
0
remains after
n
=
3
n=3
n
=
3
HVLs?
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ANSWER
1
8
I
0
\frac{1}{8}I_0
8
1
I
0
. Each HVL halves the intensity, so after three, it is reduced by a factor of
2
3
=
8
2^3=8
2
3
=
8
via exponential attenuation.
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