Interaction of beta particle

                                           FRCR MCQ    Interaction of beta particle

329.True regarding interaction of beta particle with the tissue.

a.beta particle in tissue follow a straight  path

b.beta particle undergo progressive attenuation

c.beta partcicles are easily deflected by orbital electrons of tissue

d.total range involved in tissue interaction is of the order of a few centimeters

e.easily absorbed by a few mm of Perspex or by thin sheet of metal

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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

315.ad----Chamber wall of thimble chamber must be made of air-equivalent material that matches air in terms of its effective atomic number plastic material is used as wall because its effective atomic number is 6 ( effective atomic number  of air 7.6).Graphite  is deposited on inner wall to make it electrically conducting.Wall thickness of 0.2mm is sufficient for photoelectrons from 140 kev,however thinner wall chamber is used for mammography. .(Chapter 1,page no.18,second edition (2008),Farr’s Physics for Medical Imaging).