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Detector performance out of field
•
Waterproof FC best agreement with MC
• Gafchromic was difficult to reproduce and noisy
• Edge and Photon diode (shielded)
• Over-response of electron diode previously reported (Gersh et al)
• Exradin Wi plastic scintillator
– Near water equivalent, high spatial resolution, energy independence
– Did not perform well (cable irradiated? Correction for Cerenkov?)
• MicroLion slight underestimation cf MC (lower Z, variation of stopping
power ratio)
• Pinpoint: over respond cf MC (Agnostinelli previously described
• TLD: Lower than MC (measured in WEP?)
• MicroDiamond: overresponse cf MC. Good agreement with photon
diode
• All agreed 2% global (CAX) dose. Up to 70% local agreement
• FC within 5% mostly all depths and distances. Good choice for out of
field
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