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All data from:
Perez and Brady's Principles and Practice of Radiation Oncology
Chapter 19: Physics and Biology of Brachytherapy

Table 19.1: Physical propertise and uses of brachytherapy radionuclides
Abbreviations:
1. HDR
2. LDR
3. HVL
4. LET
Abbreviations:
1. High Dose Rate
2. Low Dose Rate
3. Half-Vvalue Layer
4. Linear Energy Transfer
Radium
Isotope
Ra-226
Radium
Energy (MeV)
0.83 MeV average
Radium
Half-Life
1,626 years
Radium
HVL-Lead (mm)
16 mm Pb
Radium
Exposure Rate Constant
8.25 R cm^2 / mCi h
(with 0.5 mm platinum filtration)
Radium Source Form
Tubes and needles
Radium Clinical Applications
LDR intracavitary and interstitial
Radon
Isotope
Rn-222
Radon
Energy (MeV)
0.83 MeV average
Radon
Half-Life
3.83 days
Radon HVL-Lead (mm)
16 mm Pb
Radon Exposure Rate Constant
8.25 R cm^2 / mCi h (with 0.5 mm platinum filtration)
Radon Source Form
Gas encapsulated in gold tubing
Radon Clinical Applications
Permanent interstitial temporary molds
Cesium (High Energy)
Isotope
Cs-137
Cesium (High Energy)
Energy (MeV)
0.662 MeV
Cesium (High Energy)
Half-Life
30 years
Cesium (High Energy) HVL-Lead (mm)
3.28 mm Pb
Cesium (High Energy) Exposure Rate Constant
(none listed)
Cesium (High Energy) Source Form
Tubes and needles
Cesium (High Energy) Clinical Applications
LDR intracavitary and interstitial
Cesium (Low Energy)
Isotope
Cs-131
Cesium (Low Energy)
Energy (MeV)
0.030 MeV average
Cesium (Low Energy)
Half-Life
9.69 days
Cesium (Low Energy) HVL-Lead (mm)
0.030 mm Pb
Cesium (Low Energy) Exposure Rate Constant
0.64 R cm^2 / mCi h
Cesium (Low Energy) Source Form
Seeds
Cesium (Low Energy) Clinical Applications
LDR permanent implants
Iridium
Isotope
Ir-192
Iridium
Energy (MeV)
0.397 MeV average
Iridium
Half-Life
73.8 days
Iridium HVL-Lead (mm)
6 mm Pb
Iridium Exposure Rate Constant
4.69 R cm^2 / mCi h
Iridium Source Form
Seeds in nylon ribbon; metal wires Encapsulated source on cable
Iridium Clinical Applications
LDR temporary interstitial Intravascular brachy; cardiac HDR interstitial and intracavitary Intravascular brachy; peripheral
Cobalt
Isotope
Co-60
Cobalt
Energy (MeV)
1.25 MeV
Cobalt
Half-Life
5.26 years
Cobalt HVL-Lead (mm)
11 mm Pb
Cobalt Exposure Rate Constant
13.07 R cm^2 / mCi h
Cobalt Source Form
Encapsulated spheres
Cobalt Clinical Applications
HDR intracavitary
Iodine
Isotope
I-125
Iodine
Energy (MeV)
0.028 MeV
Iodine
Half-Life
59.6 days
Iodine HVL-Lead (mm)
0.025 mm Pb
Iodine Exposure Rate Constant
1.45 R cm^2 / mCi h
Iodine Source Form
Seeds
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