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Countersink 14° for aperture holes up to 300µm. Countersink 90° for aperture holes 500 and 700µm. Countersink 53° for hole aperture hole of 1000µm.
3.04mm diameter base with a thickness of 0.25mm. Smaller diameter is 2.0mm. Total thickness is 1.0mm.
Conventional apertures can be partly transparent for X-rays causing a higher background level when using EDX analysis. The thicker top hat apertures reduce X-ray transparency.