Saturday, 8 March 2014

FRCR MCQ ---Effective atomic number


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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