FRCR MCQ ------DIGITAL RADIOGRAPHY (LUMINESCENCE)

323.True regarding luminescence

a.absorbs energy from an external source

b.re-emits the absorbed energy in the form of visible light

c.in photoluminescence ,external source of energy is radiation

d.there is delayed light emission (delay time of order of 10^-6 s) in fluorescence

e.phosphor refers to a material that has luminescent properties

ANS OF PREVIOUS BLOG

59.True regarding mammography unit-------

a.unit designed to produce x ray in the 15-20 keV uses molybdenum anode

b. .unit designed to produce x ray in the 15-20 keV uses berrylium window

c. unit designed to produce x ray in the 15-20 keV uses molybdenum  filter

d. unit designed to produce x ray in the 21-25 keV uses molybdenum anode 

e. unit designed to produce x ray in the 21-25 keV uses  berrylium anode 

59.abc-----Unit designed to produce x ray in the 21-25 keV uses tungsten anode and uses special(Pallidium) filter anode  -------(chapter 9,page 234, Physics for diagnostic radiology ,2^nd edition by P P Dendy and B Heaton,)