FIELD STUDY FOR THE DETERMINATION OF RADIATION DOSES IN DENTAL RADIOGRAPHY UNDER ROUTINE CONDITIONS
An inexpensive and simple test device was developed and used in a field study to evaluate entrance dose, dose to an intra-oral film, filtration and field size under routine conditions in more than 150 dental practices. The test device consists of two films of different speed and a set of 5 thin copper filters for a filter analytical determination of the radiation quality. Dentists voluntarily participating in the study were asked to expose the text device (sent to them by mail) like they usually do when examining a molar tooth. Together with a short questionnaire, describing the respective conditions of film exposure and processing, the test was returned for development and evaluation. The main result was the evidence of a significant dose reduction compared to the findings of similar studies performed in 1970 and 1976. This reduction is due to a general shift to lower values and a complete disappearance of values above 45 mGy (5 R) which in 1970 were still more than 15%. In the same way the number of facilities showing insufficient filtration or collimation had decreased. Nevertheless, a large spread of dose values could still be observed, ranging from less than 0.45 mGy (50mR) to more than 26 mGy (3 R) for the entrance dose. The most striking result, however, was that such an important parameter like the speed of the films used at the respective unit turned out to have no impact on the entrance dose.
Bibliographic Reference: AVAILABILTY: WRITE TO GESELLSCHAFT FUER STRAHLEN- UND UMWELTFORSCHUNG MBH MUENCHEN, INGOLSTAEDTER LANDSTRASSE 1, 8042 NEUHERBERG (GERMANY), MENTIONING GSF REPORT S-1037, 1984
Record Number: 1989123080900 / Last updated on: 1987-01-01
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