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U.S. Department of Health and Human Services

Radiation-Emitting Products

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Focal Spot Dimension QC Test

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Citation:

900.12(e)(5)(iii)(B): Focal spot dimensions. Measured values of the focal spot length (dimension parallel to the anode cathode axis) and width (dimension perpendicular to the anode cathode axis) shall be within the tolerance limits specified in Table 1.

    Table 1

 

Focal Spot Tolerance Limit

Nominal Focal Spot Size (mm)

Maximum Measured Dimensions

 

Width (mm)

0.10

0.15

0.20

0.30

0.40

0.60

0.15

0.23

0.30

0.45

0.60

0.90

0.15

0.23

0.30

0.65

0.85

1.30