Oregon
Rule Rule 333-106-0215
Fluoroscopic X-ray Systems Requirements: Fluoroscopic Barrier Transmitted Radiation Rate Limits


(1)

The exposure rate due to transmission through the primary protective barrier with the attenuation block in the useful beam, combined with radiation from the image intensifier, if provided, shall not exceed two mR (0.516 uC/kg) per hour at 10 cm from any accessible surface of the fluoroscopic imaging assembly beyond the plane of the image receptor for each roentgen per minute of entrance exposure rate.

(2)

Measuring Compliance of Barrier Transmission:

(a)

The exposure rate due to transmission through the primary protective barrier combined with radiation from the image intensifier shall be determined by measurements averaged over an area of 100 square cm with no linear dimension greater than 20 cm;

(b)

If the source is below the tabletop, the measurement shall be made with the input surface of the fluoroscopic imaging assembly positioned 30 cm above the tabletop;

(c)

If the source is above the tabletop and the SID is variable, the measurement shall be made with the end of the beam-limiting device or spacer as close to the tabletop as it can be placed, provided that it shall not be closer than 30 cm;

(d)

Movable grids and compression devices shall be removed from the useful beam during the measurement; and

(e)

The attenuation block shall be positioned in the useful beam 10 centimeters from the point of measurement of entrance exposure rate and between this point and the input surface of the fluoroscopic imaging assembly.
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Last accessed
Jul. 11, 2020