Current through Register Vol. 61, No. 4, April 1, 2022
(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.
Measuring Compliance of Barrier
(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
Or. Admin. R.
HD 4-1985, f. & ef.
3-20-85; HD 1-1991, f. & cert. ef. 1-8-91; PH 12-2006, f. & cert. ef.
6-16-06; PH 14-2008, f. & cert. ef. 9-15-08; PH 4-2010, f. & cert. ef.
32-2014, f. 12-22-14, cert. ef.
Stat. Auth.: ORS 453.605 - 453.807
Stats. Implemented: ORS 453.605 -