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
WRITE ANS IN THE COMMENT
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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