Sources Flashcards
Tc-99 m half life
6 h
bio half life is 1 day
Tc-99 m radiation
140 keV gamma emission and IC; IC adds dose but doesn’t give info
how is Tc-99 m made?
eluted from Mo-99 (1/2 life 66 h)
I-131 radiation
beta particle
Emits gamma rays 360-720 keV plus 250-800 keV betas
half life I-131
8 days
how is I-131 made?
Most 131I production is from neutron irradiation of a natural tellurium target in a nuclear reactor.
Pd-103 radiation
-electron capture, releases characteristic xrays
0.021 keV
Pd-103 1/2 life
17 days
Pd 103 HVL and TVL
0.01 mm Pb and 0.04 mm Pb
Pd-103 gamma factor
17.6 uGym2/GBqh
Pd-103 activity at insertion
~ 1 mCi
how is Pd-103 produced?
Pd can be produced in the neutron activation of 102Pd: 102Pd(n,γ)103Pd and by nuclear reaction with a proton beam: rhodium 103 (103Rh)(p,n)103Pd
How is I-125 produced?
Xe-124 is bombarded with thermal neutrons in a nuclear reactor to yield metastable Xe-125 via neutron capture which decays to I-125 via beta plus decay
I-125 radiation
100% electron capture, releases gammas
-IC and auger electrons cause little damage outside the cell which contains the isotope atom
-0.028 keV
I-125 1/2 life
60 d
I-125 HVL and TVL
0.02 mm Pb and 0.07 mm Pb
I-125 gamma constant
34.4 uGym2/GBQh
how do you create Ir-192?
created by neutron bombardment (activation) of Ir-191 in a nuclear reactor
Ir-192 radiation
-0.38 MeV
–decays 95% of time to 192 Pt through beta emission
-for remaining 5 % of time, decays through electron capture to 192 Os. Gamma photon with average energy of 0.38 MeV (max 1.06 Mev) is released in the process
Ir-192 HVL and TVL
3 mm HVL
12 mm TVL
Ir-192 gamma constant
108 uGym2/GBqh
Co-60 radiation
beta decay, releasing 1.17 and 1.33 MeV photons
how is Co-60 produced
by bombarding a target material, either cobalt-59 or nickel-60, with neutrons
Co-60 1/2 life
5 years
Co-60 HVL and TVL
11 mm and 40 mm Pb
Co-60 gamma
309 uGym2/GBqh
Cs-137 radiation
beta decay
0.66 MeV
Cs-137 half life
30 years
Cs-137 HVL and TVL
6.5 mm and 21 mm Pb
how is Cs-137 made?
nuclear fission product
Cs-137 gamma
77.3 uGym2/GBqh
I-125 dose rate constant
0.88 and 0.93 /cm2
Ir-192 dose rate constant
1.12/cm2
Pd-103 dose rate constant
0.74/cm2
Ir-192 air kerma strength
29000-41000 U for HDR
Pd-103 air kerma strength
2.6 U
Co-60 air kerma strength
15000-18000 U
