• water Equivalent Virtual Water is an ideal alternative to traditional water tanks for performing routine QA checks of a linear accelerator using photon or electron beams Virtual Water Slabs • setting the standard in water-equivalency Virtual Water slabs are made from water-equivalent material, and are developed to be free of contaminants and air. Many standard sizes and thicknesses are available • CUSTOM CAVITIES AVAILABLE Cavities are available in slabs at least 2 cm thick to accommodate most Farmer-type or parallel plate and custom phantoms are available upon request. • virtual water specifications Length and width tolerance: +/– 0.5 mm Physical form: square slabs (standard) Sizes Available: 20 cm, 30 cm, 40 cm (standard) ionization chambers. Optional scribe lines are available for laser alignment. Virtual Water is a true water-equivalent material. Slabs from this unique material are exceptionally strong and will not stick together when stacked or stored. Virtual Water is not affected by changes in humidity or temperature and does not exhibit charge storage effects, a problem common in other water-equivalent materials. Each production run of Virtual Water is tested at an independent calibration laboratory and certified to be within 0.5% of water at photon energies. 3120 Deming Way Middleton WI 53562-1461 USA 800-261-4446 . ph 608-831-0025 . fax 608-831-2202 www.standardimaging.com © 2005 Standard Imaging, Inc. 1202-20, 11/05 Batch Consistency: +/– 0.02% (measured)