Radiation Emitting Devices Regulations — 3
3 Photofluorographic X-ray equipment shall be designed to include the following features: (a) on the control panel, the X-radiation warning sign described in section 6; (b) a warning sign that (i) is in clear view of and readily discernible by the operator, (ii) is permanently affixed to the X-ray control panel, (iii) indicates the possibility of hazardous radiation emission when the equipment is in operation, and (iv) prohibits unauthorized use; (c) electrical meters or other indicators that (i) are in clear view of the operator, (ii) are permanently affixed to the X-ray control panel, and (iii) show (A) the preset operating kilovoltage of the equipment when used in the phototiming mode, (B) the preset operating kilovoltage and milliamperage of the equipment when not used in the phototiming mode, and (C) for battery-operated equipment, the state of charge of the battery; (d) separate aural or visual indicators on the control panel that (i) are clearly discernible by the operator, and (ii) indicate when the X-ray machine is powered and when X-rays are being produced; (e) where more than one X-ray tube is controlled by one control panel, it shall not be possible to energize more than one X-ray tube at the same time and there shall be (i) at each X-ray tube housing, a visible indicator that indicates when the tube is connected and ready to be energized, (ii) at the control panel, a visible indicator that indicates which tube is connected and ready to be energized, and (iii) at the normal position of the operator, visible indicators that provide the information required by subparagraph (c)(iii); (f) an exposure switch on the control panel of a kind that requires continuous pressure by the operator to complete the circuit; (g) a timer so designed that (i) when the production of X-rays is automatically terminated after a preset time interval, (A) the preset time interval is clearly indicated, (B) an exposure cannot be initiated with the timer set to zero or in the OFF position, and (C) the minimum exposure time is not greater than 1/60 second, (ii) when the production of X-rays is automatically terminated after the integrated radiation exposure to a photocell or similar component behind the fluorescent screen is measured, there is incorporated in the timer’s electrical circuitry (A) an aural or visual indicator that indicates clearly to the operator when the phototimer has failed to terminate the exposure, and (B) a back-up or safety timer, with a maximum setting of 1 second, that will terminate the exposure in the event of phototimer failure, and (iii) when the production of X-rays is automatically terminated after a preset milliampere-second interval, the minimum milliampere-second interval is no greater than 1 milliampere-second; (h) a collimator that renders the machine inoperative if a part of the useful beam at the plane of the fluorescent screen extends beyond the useful portion of the fluorescent screen and (i) where the photofluorographic X-ray equipment is designed for a variable image receptor size and the target to fluorescent screen distance is variable, (A) the collimator shall be adjustable, and give a rectangular beam, (B) the alignment of the centre of the useful beam with the centre of the fluorescent screen shall be within two per cent of the target to the fluorescent screen distance, (C) there shall be an apron (providing attenuation equivalent to 0.25 millimetre lead for a 100 kilovolts (peak) X-ray beam of half value layer 2.7 millimetres of aluminium) on a bracket attached to the bottom of the fluorescent screen mounting that can be swiveled into place to protect the patient’s gonad area from the useful beam, (D) means shall be provided to ensure that the axis of the X-ray beam can only be perpendicular to the plane of the fluorescent screen, and (E) a light beam generator shall be incorporated into the collimator assembly (I) that visually defines the outline of the useful beam, and (II) that does not permit