Monday, 10 March 2014

FRCR MCQ--- Thimble chamber


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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Q AND A OF PREVIOUS BLOG==============



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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