Saturday 14 June 2014

MCQ ON UNSHARPNESS

465.True regarding causes of unsharpness in film –screen
a.thickness of phosphor
b.colored dyes
c.crossover
d.parallax

e.poor film-screen contact

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ANS OF PREVIOUS  BLOG

450.True regarding intensifying screen.
a.lanthanum oxybromide ,activated with  terbium ,emits a line spectrum of red light
b. lanthanum oxybromide ,activated with  terbium can be used with ordinary X-ray
c.Gadolinium and lanthanum oxysulphide activated with terbium emit yollow light
d. Gadolinium and lanthanum oxysulphide activated with terbium can be used with an orthochromatic film
e.red safe light is necessary in orthochromatic film while amber safe light is used with ordinary x ray film


450.bde----Lanthanum oxybromide ,activated with  terbium ,emits a line spectrum of blue light lanthanum oxysulphide activated with terbium emit green light. .(Chapter 4,page no.67,second edition (2008),Farr’s Physics for Medical Imaging).

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