Relative Dosimetry | Detectors |
Detectors |
Relative Dosimetry of high energy photon and electron beams in Radiotherapy
The following table is a guide to select the appropriate detector:
Ion Chambers
| CC13 | CC13-S | CC25 | ||
Active volume (cm3) |
0.13 | 0.13 | 0.25 | |
Inner radius (mm) |
3 | 3 | 3 | |
Sensitivity (Gy/C x 107) |
27 | 27 | 13 |
Ion Chambers for Stereotactic / IMRT
| CC01 | CC04 | |||
Active volume (cm3) |
0.01 | 0.04 | ||
Inner radius (mm) |
1 | 2 | ||
Sensitivity (Gy/C x 107) |
317 | 94 |
Ion Chambers for Industrial
| CC08 | ||||
Active volume (cm3) |
0.08 | |||
Inner radius (mm) |
3 | |||
Sensitivity (Gy/C x 107) |
51 |
Diodes
| PFD | EFD | RFD | SFD (for Stereotactic and IMRT) |
|
Diameter of active area (mm) |
2 | 2 | 2 | 0.6 |
Thickness of active volume (mm) |
0.06 | 0.06 | 0.06 | 0.06 |
Sensitivity (Gy/C x 107) |
3 | 4 | 3.3 | 17 |
Parallel plate chambers for Absolute Dosimetry of electron beams
| PPC05 | PPC40 | NACP | ||
Inner electrode diameter (mm) |
10 | 16 | 10 | |
Outer diameter (mm) |
30 | 44 | 30 | |
Guarding width (mm) |
1 | 4 | 3 | |
Sensitivity (Gy/C x 107) |
58 | 9 | 16 |
Application energy range for photons from Co60 - 50 MV and for electrons from 4 MeV - 50 MeV.