ESTRO course Dose Modelling and Verification 2017

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Cable leakage in a PinPoint chamber
Agostinelli et al [21]
Normally, the signal from stem and cable irradiation is small enough (< 1 pC/(Gy·cm)) to
be neglected, but the small air volume yields a low detector signal level…
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125 mm3 air ion
chamber
15 mm3
Pinpoint chamber
0.4 pC/(Gy·cm)
0.2 pC/(Gy·cm)
at 10 cm depth at 10 cm depth