24.True
regarding radionuclides
a.Indium-111,2.8
day half-life,emit 173 keV and 247 keV gamma rays,labeling blood products
b.Iodine
-123,13hr half –life, emit 160 keV gamma rays ,used for thyroid imaging
c.Iodine-131,8days
half-life,emit 360 keV gamma rays and negative beta particle,used in metastases
from carcinoma of thyroid
d.Gallium-67,72 hrs half-life,emit 92 keV,182keV and 300keV
,used in soft tissue malfnancy and infection
e.carbon ,20
minutes half –life, emit positron giving 511 keV gamma rays ,used for Co2
for regional cerebral blood flow
ANS OF PREVIOUS BLOG
9.True
regarding interaction------
a.the amount
of energy required to create an ion pair is about 34 keV
b.x ray and
gamma difficult to stop being uncharged and zero rest mass
c.the beta
particle has mass and is charged ,so stopped easily (by perspex)
d.protons and
alpha particles are more massive than negative beta particle and are charged( stopped by paper)
e.neutrons
are more penetrating than proton ,being uncharged
9.abcde----- ------(Physics for
diagnostic radiology ,2nd edition by P P Dendy and B Heaton,chapter
12,page 3 )
No comments:
Post a Comment