Brass Build-up Caps for Ionization Chambers

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 acrylic 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.

Brass build-up caps are available for the chamber types:

• 0.6 cm³ Farmer chambers
• 0.125 cm³ Semiflex chamber
• PinPoint 3D chamber
• Semiflex 3D chamber The wall thicknesses cover the energy range from 60Co to 20 MV photons.

Key Features

• Photon energy ranges from ⁶⁰Co up to 20 MV
• Establish electron equilibrium for in-air measurement
• Suitable for Farmer, Semiflex and PinPoint 3D chambers
• Made of brass