PTW
Pinpoint Ionization Chambers
Model N31014, 0.015 cc
Model N31015, 0.03 cc
Model N31016, 0.015 cc spherical
PTW Pinpoint chambers have been specially designed for relative beam profile measurements in a motorized water phantom for characterization of LINAC radiation fields where superior spatial resolution is desired, and for evaluation of stereotactic and IMRT small radiation fields.
The Model N31016 distinguishes itself in having a flat angular response due to its sensitive volume being nearly spherical.
When calibrated, the Pinpoint chambers can be used for depth dose and absolute dose measurements. The sensitive volume is vented, requiring air density correction. The wall material is graphite with a protective acrylic cover. The chambers are fully guarded up to the sensitive volume. The nominal energy ranges are 60Co up to 50MV photons and 6 to 50MeV electrons. The chambers have a 28mm long aluminum stem for mounting and a 1.3m cable with choice of connector.