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Collimator exchange effect for Theraton Phoenix Co-60 measured with Mini phantom
| Long field size (X/Y)(cm) | Water phantom measurement Oo(X,Y) | % Deviation | |
|---|---|---|---|
| X= 5 cm | Y= 5 cm | ||
| 5 | 0.982 | 0.982 | 0.00 |
| 6 | 0.985 | 0.985 | 0.00 |
| 8 | 0.990 | 0.990 | 0.00 |
| 10 | 1.000 | 1.000 | 0.00 |
| 15 | 1.013 | 1.013 | 0.00 |
| 20 | 1.019 | 1.019 | 0.00 |
| 25 | 1.026 | 1.028 | −0.19 |
| 30 | 1.027 | 1.030 | −0.29 |
| 35 | 1.027 | 1.031 | −0.39 |
