MCQ ON NUCLEAR IMAGING

592.True regarding iodine -123 

a.half life –13hrs

b.decays wholly by positive beta 

c.emits 160 keV Gamma rays

d.emit 28 keV X-rays

e. emit positive beta particle

ANS OF PREVIOUS BLOG

589.True regarding isomeric transition

a.⁹⁹Mo decays by the emission of beta particle with simultaneous emission of gamma rays

b.⁹⁹T_c^mm decay to the ⁹⁹T_c with emission of Gamma ray of energy of 140 keV

c. ⁹⁹T_c has short half-life

d.Decay of rubidium-81 to krypton -81 is an example of isomeric transition

e.isomers have different energy states and half-life

589.bde----⁹⁹Mo decays by the emission of beta particle but there is delay of hours of emission of gamma rays. ⁹⁹T_c has a very long  half-life (200000 yrs ). . ⁹⁹T_c^m has short half life of 6hours. (Chapter 8, page no.123,second edition (2008),Farr’s Physics for Medical Imaging).