FRCR MCQ ---ATOM

FRCR MCQ ---ATOM

252.True regarding  atom 

a.innermost electron shell is concerned with optical and electrical properties of the element

b.the properties of x ray and their interaction with materials concern with nucleus 

c.radiactivity concerns orbiting electrons

d. outer electron shell is concerned with chemical and thermal  properties of the element

e.metal ‘s good conduction of heat and electricity is due its free one,two or three electrons

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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 for radiation protection

248.bcd----No secondary barrier is required for areas protected by a primary barrier.The energy of secondary radiation is assumed to be equal to that of the primary radiation for radiation protection (Chapter 21,Page 383-90,  4^th edition ,1990  reprinted 2010 , Christensen’s Physics of Diagnostic radiology].