Absolute Dosimetry | Detectors |
Detectors |
Absolute Dosimetry
The following table is a guide to select the appropriate detector:
Farmer type cylindrical chambers for Absolute Dosimetry of photon and electron beams in air, solid or water.
| FC65-G | FC65-P | FC23-C | ||
Active volume (cm3) |
0.65 | 0.65 | 0.23 | |
Outer electrode (g/cm3) |
Graphite 1.82 |
POM 1.42 |
C552 1.76 |
|
Inner electrode (g/cm3) |
Aluminium 2.7 |
Aluminium 2.7 |
C552 1.76 |
|
Sensitivity (Gy/C x 107) |
5 | 5 | 14 |
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.
In principal, cylindrical chambers with a volume >/= 0.1 cm3 can be used for Absolute Dosimetry.