Brachytherapy Sources Flashcards
What are the physical characterisitics of Ra-226?
Half Life : 1600 yr
Photon energy: 0.047-2.45 MeV (0.83 avg)
Half Value Layer: 12.0 mm lead
What are the physical characteristics of Rn-222?
Half Life : 3.83 days
Photon energy: 0.047-2.45 MeV (0.83 avg)
Half Value Layer: 12.0 mm lead
What are the physical characterisitics of Co-60?
Half Life : 5.26 yr ( 1 % / month )
Photon energy: 1.17, 1.33 MeV
Half Value Layer: 11.0 mm lead
What are the physical characteristics of Cs-137?
Half Life : 30 yr ( 2 % / year)
Photon energy: 0.662 MeV
Half Value Layer: 5.5 mm lead
What are the physical characterisitics of Ir-192?
Half Life : 73.8 days ( 1 % / day )
Photon energy: 0.136-1.06 MeV (0.38 avg)
Half Value Layer: 2.5 mm lead
What are the physical characterisitics of Au-198?
Half Life : 2.7 days
Photon energy: 0.412 MeV
Half Value Layer: 2.5 mm lead
What are the physical characterisitics of Pd-103?
Half Life : 17.0 days (4 % / day)
Photon energy: 0.021 MeV avg
Half Value Layer: 0.008 mm lead
What are the physical characterisitics of I-125?
Half Life : 59.4 days (1 % / day)
Photon energy: 0.028 MeV avg
Half Value Layer: 0.025 mm lead
What sources are smallest energy and normally used interstitially?
I-125
Pd-103
Cs-137
Which brachy sources have higher energy photons?
Co-60
Cs-137
Ir-192
