380 / 1359
References 3
16. Zhu TC, Ahnesjö A, Lam KL, Li XA, Ma CM, Palta JR, Sharpe MB, Thomadsen B, Tailor
RC (2009) Report of AAPM Therapy Physics Committee Task Group 74: in-air output
ratio, Sc, for megavoltage photon beams. Med Phys 36, 5261-91
17. Jursinic PA (2006) Measurement of head scatter factors of linear accelerators with
columnar miniphantoms. Med Phys 33, 1720-8
18. Frye DM, Paliwal BR, Thomadsen BR, Jursinic PA (1995) Intercomparison of
normalized head-scatter factor measurement techniques. Med Phys 22, 249-53
19. Weber L, Nilsson P, Ahnesjö A (1997) Build-up cap materials for measurement of
photon head-scatter factors. Phys Med Biol 42, 1875-86.
20. Krauss H (Institute for Radiooncology, Kaiser Franz Josef Hospital, Vienna, Austria)
www.wienkav.at/kav/kfj/91033454/physik/PTW/liquid.htm21. Agostinelli S, Garelli S, Piergentili M, Foppiano F (2008) Response to high-energy
photons of PTW31014 PinPoint ion chamber with a central aluminum electrode. Med
Phys 35, 3293-301
22. Aget H, Rosenwald JC (1991) Polarity effect for various ionization chambers with
multiple irradiation conditions in electron beams. Med Phys 18, 67-72.