Sc Brass Mini Phantom, for Multivoltage Photon Beams

S_c Brass Mini Phantom, for Multivoltage Photon Beams.

Task Group 74

In-Air output ratio (S_c) is defined as the ratio of primary collision water kerma in free-space, K_p, per monitor unit between an arbitrary collimator setting and the reference collimator setting at the same location.  Mini phantoms with sufficient lateral and longitudinal thickness to eliminate electron contamination and maintain transient electron equilibrium are recommended for the measurement of S_c.  Mini phantoms made of high-Z material are used to measure S_c for small fields (e.g. IMRT or stereotactic radiosurgery).

Customer is to specify the chamber and dimensions that will be used.  To do so please fill out the drawing that is found under the documents tab and send in with your order.

Reference:  Report of AAPM Therapy Physics Committee Task Group 74: In-air output ratio, Sc, for megavoltage photon beams - Timothy C Zhua) - University of Pennsylvania, Philadelphia, PA; Andres Ahnesjö - Uppsala University, 751 85 Uppsala, Sweden and Nucletron AB, Box 1704, 751 47 Uppsala, Sweden; Kwok Leung Lam - University Michigan, Ann Arbor, MI 48109; X. Allen Li - Medical College of Wisconsin, Milwaukee, WI 53226; Chang-Ming Charlie Ma - Fox Chase Cancer Center, Philadelphia, PA 19111; Jatinder R. Palta - University of Florida, Gainsville, FL 32610; Michael B. Sharpe - Princess Margret Hospital, Toronto, ON M5G 2M9, Canada; Bruce Thomadsen - University of Wisconsin, Madison, WI 53705; Ramesh C. Tailor - RPD, UT MD Anderson Cancer Center, Houston, TX 77030 - Med. Phys. 36 (11), November 2009.