Figure 2
Measured attenuation for 25 µm (×), 50 µm (+) and 100 µm (). The attenuation level varied from ∼0.5 and ∼8, covering an approximately four orders of magnitude change in the attenuate intensity. Measuring this extended range of attenuation required precision calibration of the detection system and allowed accurate quantification of attenuation-dependent systematic errors. |