[Some measurements of doses to patients in dental radiography]

Some measurements of doses to patients by conventional dental radiography and orthopantomography are presented. Doses to the red bone marrow are calculated. The bonemarrow doses by two different exposures, Maxilla incisor and Molar bite-wing, were calculated to 0.4 and 1.0 mrad respectively. The average dose to red bone marrow from a full-mouth examination (10 exposures) was 0.7 mrad/exposure, An orthopantomographic examination involved 2 mrad to the bone marrow. The greatest doses by an orthopantomographic examination were found around the lateral rotational axis, namely 700 mrad. The dose distributions by the two different cone lengths did not differ as much as expected, mainly due to scattered radiation.