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Figure 1. All dimensions in inches ±0.005.
Figure 2. All dimensions in inches ±0.005.
Figure 4. Typical Detector Geometry.
Collimators can be made from material other than Aluminum, like Copper, Tungsten, Silver or other, provided the fluorescence peaks from the collimator material do not interfere with the anticipated measurement.
In cases where fluorescence peaks produced from the edges of collimators need to be minimized or eliminated, a multilayer collimator can be made by progressively using lower Z materials. Each layer will act as an absorber to the fluorescence peaks of the previous layer. The final layer will be of the lowest Z material whose fluorescence peaks are of low enough energy to be outside the anticipated X-ray detection range.
Amptek has developed a state-of-the-art internal MultiLayer Collimator (ML). The base metal is 100 µm of tungsten (W), the first layer is 35 µm of chromium (Cr), the second layer is 15 µm of titanium (Ti), and the last layer is 75 µm of aluminum (Al).
Figure 5. All dimensions in inches ±0.005.
Revised September 17, 2012