Table 1.
Methods employed and their popularity, for source strength measurement of HDR & PDR sources at centres in UK
| Technique for determination of source strength | Number of centres | Percentage of centres | |
|---|---|---|---|
| Initial method | Well chamber | 29 | 94 |
| Manufacturer supplied source certificate | 1 | 3 | |
| NE2571 chamber with in-air jig | 1 | 3 | |
| Verification method | Well chamber (second unit) | 14 | 45 |
| NE2571 chamber with in-air jig | 12 | 39 | |
| NE2571 chamber in solid phantom | 2 | 6 | |
| Manufacturer supplied source certificate | 1 | 3 | |
| I-125 seed device with adaptor | 1 | 3 | |
| Gafchromic film calibrated via 260kV X-rays | 1 | 3 | |