ION CHAMBER POSITIONING CASSETT MODEL 650

Ion Chamber Positioning Cassett

Off-axis measurements - easy, accurate and reproducible

Model 650 Features • Position ion chamber anywhere in 25 x 30 cm field • Simple Set-up • Accommodates any ion chamber • Can be used with Ready PackTM Radiographic Film Model 650 Ion Chamber Positioning Phantom is designed to provide an easy, accurate and reproducible method of making off-axis dose verification and calibration measurements. Its unique design offers the ability to smoothly slide the ion chamber positioning assembly within a solid phantom material in two dimensions for a measurement anywhere within the 25 x 30 cm area. Model 650 is constructed of Plastic Water® that faithfully mimics water within 1% from 0.5 MeV to 100 MeV or the new DT type Plastic Water® developed specifically for IMRT applications that mimics water within 1% from 0.05 MeV to 25 MeV. It is suitable for use in both, photon and electron therapy. Minimum chamber depth is 3 cm, minimum scatter is 5 cm. Pegs are provided to accurately locate additional 30x30 cm buildup and scatter material. With the top plate removed, chamber depth can be as little as 1 cm. Ready-Pack radiographic film up to 10x12” may be placed within 10mm of the ion chamber plane for simultaneous dose distribution measurements. One ion chamber holder machined to accommodate a specified ion chamber is included. Additional ion chamber holders machined for any ion chamber are available at extra cost. *Shown with optional 5 cm Plastic Water® slab.