Effective atomic number
294.True regarding effective atomic number
a.a mixture
or compound has an effective atomic number
b.refers to
average of the atomic numbers of the constituent elements
c.effective
atomic number of fat,air and atomic
number is 6.4,7.6 and 7.4 respectively
d.effective
atomic number of bone is 13.3
e.the Compton
,not photoelectric interaction depend on the effective atomic number
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Tube potential(kv)and x ray spectrum
278.True regarding effects of tube potential(kv) .
a.increasing the kv shifts the x ray spectrum upwards and to the right
b.increasing the kv increases the maximum energy of x ray photons
c.increasing the kv decreases the effective energies of x ray photons
d.increasing the kv increases the total number of x ray photons
e.increasing the kv decreases the efficiency of x ray production.
278.abd---Increasing the kv increases the
effective energies of x ray photons and
the efficiency of x ray production.No characteristic
radiation is produced below 70kv for a tungsten target. .(Chapter 1,page no.8,second edition (2008),Farr’s Physics
for Medical Imaging).
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