1. Late or long term effects of
radiation exposure are generally represented by :
Ans
: Linear non threshold
2.according
to the NCRP, the annual occupational dose equivalent dose equivalent to the
lens of the eye is :
Ans
: 150mSv
3.
which one is the intensifying screen phosphor material can help in reducing
patient dose :
Ans:
Gadolinium and Lanthanum
4.
which devices helps reduce patient dose :
Ans
: Collimator and gonad shield
5.How
will X-ray photon intensity be affected if the SID is doubled ?
Ans
:Its intensity decreases four times
6.What
is the established fetal dose limit guideline for pregnant radiographers during
the entire gestation period ?
Ans
: 500rem
7.
Irradiation of water molecules within the body, and their resulting breakdown
is termed :
Ans
: Radiolysis
8.
The X-ray interaction with matter that is responsible for the majority of
scattered radiation reaching the IR is :
Ans
: Compton scatter
9.Each
time an X-ray beam scatters, its intensity at 1m from the scattering object is
what fraction of its original intensity ?
Ans:
1/1000
10.
According to the NCRP, the annual occupational whole -body dose
equivalent limit is :
Ans
: 50 mSv
11.
A thermoluminescent dosimetry system would use which of the followung crystals
?
Ans
: Lithium fluoride
12.The
photoelectric effect is an interaction between an x - ray photon and :
Ans
: An inner-shell electron
13.
in radiation protection ,the product of absorbed dose and the correct modifying
factor (rad x QF) is used to determine :
Ans
: Rem
14.
What is likely to occur if 25 rad is accidentally delivered to a recently
fertilized ovum ?
Ans
: Spontaneous abortion
15
. How does filtration affect the primary beam ?
Ans
: It increases the average energy of the primary beam
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