FRCR MCQ----RADIATION PROTECTION

FRCR MCQ----RADIATION PROTECTION

248.True regarding protection barrier 

a. secondary barrier is required for areas protected by a primary barrier

b. use factor (U) for stray radiation is always one (1)

c. correction factor for secondary protection =actual field size/400 (control field size)²

d. 0.2m R  is the maximum permissible exposure that the film should receive during its entire storage life

e. the energy of secondary radiation is assumed to be less than to that of the primary radiation 

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FRCR MCQ ---CHARACTERISTIC CURVE

146.True regarding characteristic curve .

a.average gradient and speed is expressed in numeric terms

b.latitude of a film varies proportionally  with film contrast

c.latitude refers to the range of kVp

d.latitude is defined to produce a density within accepted range for diagnostic radiology(0.25 to 2.0)

e.more room for error in exposure in case of low  latitude film

146.ad----Latitude  refers to the range of log relative exposure (mAs) that will produce density within the accepted range for diagnostic radiology .Latitude of a film varies inversely with film contrast.The technician has more room for error in case of higher latitude film.[Chapter 11,Page 159-60,  4^th edition ,1990  reprinted 2010 , Christensen’s Physics of Diagnostic radiology].