Physical Characteristics of 125I Seeds (OncoSeed, Model 6711; Amersham)
| Physical parameter | Characteristic |
|---|---|
| Principal radionuclide | 125I |
| Radionuclide purity | >99.9% for 125I or <0.005% for 126I |
| Half-life of 125I | 59.43 d |
| Types of radiation | x-Ray and γ-photon |
| Energy levels | |
| x-Ray/γ-photon | 27.4 keV |
| x-Ray | 31.4 keV |
| γ-Photon | 35.5 keV |
| Fluorescent x-rays from titanium capsule | 22.1 and 25.2 keV |