FRCR MCQ--- Thimble chamber
315.True regarding chamber wall of thimble chamber.
a.must be made of air-equivalent material that matches
air in terms of its effective atomic number
b.plastic material is used as wall because its effective
atomic number is 26
c.silver is deposited on inner wall to make it
electrically conducting
d.wall thickness of 0.2mm is sufficient for
photoelectrons from 140 kev
e.thicker wall chamber is used for mammography
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FRCR MCQ ---Ionising radiations
302.True regarding ionising radiations
a.x- rays and gamma rays are indirectly ionizing agents
b.alpha particle is directly ionizing agents
c. all ultraviolet radiations are ionizing in nature
d. neutrons are indirectly ionizing agents
e. beta particle are directly ionizing agents
302.abde --- Some ultraviolet radiation has a sufficiently high photon energy to ionize air (Chapter 1,page no.15,second
edition (2008),Farr’s Physics for Medical Imaging).
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