RT Question 3

The pin hole technique used to determine:

a) actual focal spot

or 

b) effective focal spot

2 Replies

  • B) Effective Focal Spot Refer to ASTM E1165 - Standard Test Method for Measurement of Focal Spots of Industrial X-Ray Tubes by Pinhole Imaging. The excerpt below is from E1165. 1. Scope 1.1 The image quality and the resolution of X-ray images highly depend on the characteristics of the focal spot. The imaging qualities of the focal spot are based on its two dimensional intensity distribution as seen from the detector plane. 1.2 This test method provides instructions for determining the effective size (dimensions) of standard and mini focal spots of industrial x-ray tubes. This determination is based on the measurement of an image of a focal spot that has been radiographically recorded with a “pinhole” technique.
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