Superficial/Stereotactic Ion Chamber
Designed primarily for calibrating the X-ray output of therapy superficial machines and
stereotactic dosimetry, this chamber is also suitable for measuring buildup in solid
phantoms. The acrylic chamber body has backscatter properties similar to skin, and the
thin window permits accurate measurements of soft X-ray radiation. The energy response
is exceptionally flat over the 10kV to 100kV range.
Depth dose may be obtained by using a specially-machined phantom section which positions the chamber at the beam central axis with its window level with the surface. This then becomes part of a phantom assembly and the desired buildup thickness may be added. Depth buildup may also be accomplished by placing a special cylindrical water phantom over the chamber and adding water as necessary.