NE2528Â Perspex Phantom for Therapy Beam QC
â€‹The NE2528/3 Water Phantom is a portable phantom used in conjunction with a Farmer Ionization Chamber (2505/3) for routine consistency checks of therapyÂ beam output.
This portable water phantom consists of a strong â€œPerspexâ€? (Polymethyl methacrylate) box containing a transverse tubular sleeve into which the 0.6cc Farmer Ionization Chamber 2505/3 fits. The center of the chamber volume aligns exactly with the intersection point of reference lines engraved on the beam entrance side of the box. A small spring clip prevents the chamber moving during use. A removable screw plug in the base enables the box to be filled with water. Two expansion chambers are provided to enable it to be used over a wide range of ambient temperatures and pressures.
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