SOURCE
2007 Therapy Part II (attached)
Related to Tg-51

Simple question 11
11. TG51: What's the upper limit for Pion?

DRR answer: Per pg 1853 of TG51, I get 1.05, or 5% would be the answer. Above this it states that if the correction for the chamber is larger than this it is unacceptable.

Question 12 TG51. Where is the cylindrical chambers center placed for photon beam calibration?

DRR answer: On central axis of the chamber and placed at the reference dpeth when measuring dose at an individual point.

Question 13. To cross calibrate a parallel plate chamber what should one us?

DRR answer: Since Co-60 cal factors for plane parallel chambersare sensitive to their construction, they should be calibrated against already calibrated cylindrical chambers in a high energy electron beam.

NOTE
Questions 14, 15, 16 aren't as well formulated, or in some cases the choices listed aren't complete so we'll have to come up with a better worded question for these.

Enjoy,
Dave