The Nordic radiation protection authorities have already published recommended guidance levels for patient doses for six conventional radiological examinations. Over the past two years a similar protocol has been in progress for three interventional procedures. Measurements have been performed in 22 different hospitals in the Nordic countries on patients in the weight range 40-100 kg. The selected procedures are percutaneous transluminal coronary angioplasty (PTCA), percutaneous transluminal angioplasty (PTA) and endoscopic retrograde cholangio- and pancreatio-graphy (ERCP). A total of 281 PTCA procedures, 304 PTA procedures and 147 ERCP procedures are included in the study. The results from this survey are presented as a first attempt to set guidance levels.
Half value layer and exposure of 90" scattered radiation from an Alderson phantom have been measured at 1 m distance from the central ray of the primary beam. Results are presented for X-ray beams from 50 to 200 kV for two field sizes-one field adjusted to a 14 in. x 17 in. film size and the other was larger by a factor of 1.8.The rather high figures recently reported by WAGGENER et al. (1975) for scattered radiation measured under similar conditions were not confirmed by our findings, which are in agreement with results published by other workers.
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