Table 1 Specifications of Octavius 729, Octavius 1500, and MatriXX ion chamber detector arrays.
Characteristics | Octavius 729 | Octavius 1500 | MatriXX |
|---|---|---|---|
Detector type | Vented parallel plate ion chamber | Vented parallel plate ion chamber | Vented parallel plate ion chamber |
Detector number | 729 | 1405 | 1020 |
Detector diameter | 5Â mm | 4.4Â mm | 4.4Â mm |
Detector shape | Square | Rectangle | cylindrical |
Detector height | 5Â mm | 3Â mm | 5.5Â mm |
Detector volume | 0.125Â cm3 | 0.058Â cm3 | 0.07Â cm3 |
Centre spacing | 10Â mm | 7.07Â mm | 7.62Â mm |
Maximum dose rate | 12Â Gy/min | 12Â Gy/min | 12Â Gy/min |
Working voltage | 400Â V | 400Â V | 500Â V |
Maximum measuring area | 27 × 27 cm2 | 27 × 27 cm2 | 24 × 24 cm2 |
Detector shape | Cuboid | Cuboid | Cylindrical |
Absorber material on top of the array | 5Â mm polystyrene | 5Â mm polystyrene | 3Â mm ABS resin |
