The principle of radiographic X-ray spot size measurement with Bread piece was presented. The output responses of the Bread piece for uniformly-distributed X-ray sources are calculated numerically. The relationship between FWHM of the response curve and the spot size is obtained. Preliminary experiments were performed on the inductive voltage adder (IVA), and the Bread piece is used to measure the axial spot size of the rod-pinch diode (RPD) radiographic source. Under the hypothesis of uniformly-distributed line source, the axial spot size value is obtained, consistent with the measuring result of the pinhole camera, verifying the applicability of the Bread piece for radiographic X-ray spot size measurement.

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