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Q6
Which of the following is a reference condition
1. Measuring at a point at the equivalent reference depth , field
size 10x10cm
2
, SSD=100 cm, in a plastic water equivalent
phantom
2. Measuring at a point at the reference depth, field size
20x20cm
2
3. Measuring in a lung equivalent phantom
4. Out axis measures
5. Small field measures
6. None of the above are reference conditions