FRCR MCQ-----Ionising radiations

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

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294.True regarding  effective atomic number 

a.a mixture or compound has an effective atomic number

b.refers to average of the atomic numbers of the constituent elements

c.effective atomic number of fat,air  and atomic number is 6.4,7.6 and 7.4 respectively

d.effective atomic number of bone is 13.3

e.the Compton ,not photoelectric interaction depend on the effective atomic number

294.acd----  Effective atomic number refers to weighted  average of the atomic numbers of the constituent elements.The Compton and  photoelectric interaction depend on the effective atomic number but not on the molecular configuration 

(Chapter 1,page no.13,second edition (2008),Farr’s Physics for Medical Imaging).