FRCR MCQ---Deterministic effect (non-stochastic effect)

   FRCR MCQ---Deterministic effect (non-stochastic effect)

334.True regarding deterministic effect (non-stochastic effect) 

a.no effect above threshold dose

b.the rate at which the dose is delivered influences the threshold dose

c.most deterministic effect have  no repair mechanisms

d.greatest fetal abnormality in the third week to third month week of pregnancy

e.large  variation in threshold dose from individual to individual

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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

329.ce-----beta particle in tissue follow a very tortuous path because beta partcicles are easily deflected by orbital electrons of tissue.Total range involved in tissue interaction is of the order of a few millimeters. Beta particle  eventually gives all its energy to tissue.Unlike beta particles ,x ray and gamma rays radiations donot have a mninimum depth of penetration associated with them ,but they simply undergo progressive attenuation,that is the intensity of the radiation beam continues to fall as it interacts with tissue but at any give depth a residual beam always remains.( Chapter 2,page no.23-24,second edition (2008),Farr’s Physics for Medical Imaging).