Electron Beam Thin Foil Calorimeters
Thin foil calorimeters are used as in-line calorimeters and for the measurement of deposition profiles. A depth dose stack consists of a series of thin foils that each absorb a small fraction of the total beam energy. This fraction is spectrum-dependent. Titanium or graphite are used to fabricate the depth-dose stacks.
A thermocouple element, attached to each foil, measures the temperature rise. The dose absorbed by each foil is calculated from the foil's material enthalpy curve. Titanium foils are used for doses up to at least 80 cal/gm. At higher fluences, the graphite foil stacks are used up to 200 cal/cm2. Some advantages of thin foil calorimeters are:
- Repeatable
- Require only minutes of setup time
- Fast data turnaround time
A key parameter in the interpretation of depth-dose data is the estimate of scattering loses. AP&T's expertise in three-dimensional radiation transport allows the parameters to be accurately estimated.
