Features

·    Photon energy ranges from ⁶⁰Co up to 30 MV

·    Establish electron equilibrium for in-air measurement

·    Made of PMMA or brass

Build-up caps are used with thimble ionization chambers for in-air measurements in photon beams when electron equilibrium is desired. Each standard delivery of a thimble chamber includes an appropriate PMMA build-up cap for ⁶⁰Co. Optionally, a variety of build-up caps is available for different ionization chamber types and for different photon energy ranges. PMMA material is usually used for build-up caps. PMMA build-up caps are more water equivalent than brass build-up caps, but their size may be disadvantageous when used in small beams.

PMMA build-up caps are available for the any chamber types. The PMMA build-up caps are designed with wall thicknesses for various energy ranges from ⁶⁰Co up to 30 MV photons.

Brass build-up caps are available for any chamber types. The wall thicknesses cover the energy range from ⁶⁰Co to 20 MV photons.

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