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Göteborgs universitets publikationer

Evaluation of eye lens doses received by medical staff working in interventional radiology at sahlgrenska university hospital

Författare och institution:
Viktor Sandblom (Institutionen för kliniska vetenskaper, sektionen för onkologi, radiofysik, radiologi och urologi, Avdelningen för radiofysik); Charlotta Lundh (Institutionen för kliniska vetenskaper, sektionen för onkologi, radiofysik, radiologi och urologi); Ake Cederblad (-); Pernilla Jonasson (-)
Sammanfattning (abstract):
Background: The International Commission on Radiological Protection (ICRP) recently lowered their recommended occupational eye lens dose limit from 150 mSv in a year to 20 mSv in a year, averaged over a defined period of 5 years. Aim: The main aim of the present study was to investigate the eye lens doses received by the interventional staff at Sahlgrenska University Hospital. Another aim was to evaluate whether the dose recorded by the PDM, a dosimeter worn at thorax height, could be used as an indicator of eye lens dose. Material and Methods: To prepare for the personnel eye lens dose assessments, phantom measurements were carried out. These preparations included deciding the optimal position of an eye lens dosimeter, evaluation of different models of lead glasses and estimation of a ratio between the eye lens dose and the dose recorded by the PDM. Personnel eye lens doses were assessed using TL-dosimeters held by individual headbands worn by staff members at the Catheterization Laboratory at the department of Cardiology and at the division of Peripheral Interventional Radiology at the department of Radiology at Sahlgrenska University Hospital for one month. Staff members also wore a PDM at thorax height outside their lead apron. Results and Discussion: Materials with an equivalent lead thickness of 0.75 mm block over 95% of incident radiation but the lead glasses evaluated (0.75 mm) reduced the eye lens dose by only 30-88% due to radiation back scattered in the head and oblique incident radiation. Many operators reported annual eye lens doses of over 10 mSv. The eye lens doses of nurses were generally much lower. The ratios between equivalent doses recorded by TLD and PDM were as expected higher for nurses than for operators but the ratios varied also between different operators. Conclusions: The estimations of annual doses have uncertainties and the lens doses of operators are high enough to cause concern. Based on the results of the present study, operators might be recommended to wear lead glasses in the future. Estimating eye lens dose from the dose recorded by the PDM is difficult. This method includes large uncertainties. The PDM should instead be used to indicate whether a more precise measurement is necessary.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
Klinisk medicin ->
Klinisk medicin ->
Radiologi och bildbehandling ->
Diagnostisk radiologi
Klinisk medicin ->
Radiologi och bildbehandling ->
Ytterligare information:
Master of Science thesis
Postens nummer:
Posten skapad:
2014-12-03 14:44
Posten ändrad:
2015-01-26 16:43

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