Models N31010 & N31013
Beam Plotting Ion Chambers
These precision ion chambers from PTW have been designed specifically for beam scanning applications of photon and electron beams in water phantoms.
The Model N31010 (formerly N31002) has a nominal volume of 0.125cc for increased spatial resolution along the axis, which allows scanning in all directions without repositioning the chamber. The internal dimensions of 5.5mm diameter and 6.5mm length makes the sensitive volume almost spherical.
The Model N31013 (formerly N31003) has a nominal volume of 0.3cc for improved signal-to-noise and leakage current ratio.
Both chambers have a rigid stem with a nominal outside diameter of 7mm that allows convenient mounting in most water phantom chamber holders.
Although these ion chambers can be safely inserted and used in water, it is a matter of good practice to limit the immersion time to the actual duration of measurements. The chambers should be removed from the water, dried and stored shortly after completion of scanning studies.
Both chambers are supplied with an acrylic 60Co build-up cap, 1 meter of cable terminated with triax BNC with cap & chain, and a foam-lined case.