Table 3.
Characteristics of some recommended cylindrical ionisation chambers for reference dosimetry in medium energy x-rays.
| Chamber type | Volume (cm3) | Wall material | Central electrode | Wall thickness (mg cm-2) | Waterproof? | Manufacturer |
|---|---|---|---|---|---|---|
| 30010 | 0.6 | graphite & PMMA | aluminium | 56.5 | no | PTW1 |
| 30012 | 0.6 | graphite | aluminium | 79 | no | PTW1 |
| 30013 | 0.6 | graphite & PMMA | aluminium | 56.5 | yes | PTW1 |
| 30015 / 23331 | 1.0 | graphite & PMMA | aluminium | 73 | no | PTW1 |
| 30016 / 23332 | 0.3 | graphite & PMMA | aluminium | 67 | no | PTW1 |
| 31013 | 0.125 | graphite & PMMA | aluminium | 78 | yes | PTW1 |
| 2561 | 0.325 | graphite | aluminium | 90 | no | NE2 |
| 2611 | 0.325 | graphite | aluminium | 90 | no | NE2 |
| 2571 | 0.6 | graphite | aluminium | 65 | no | NE2 |
1
PTW: PTW-Freiburg GmbH, Freiburg, Germany.
2
Bicron-NE Ltd, Beenham, Reading, United Kingdom.