Veille documentaire MTPH

Médecine du travail du personnel hospitalier

Eye doses to staff in a nuclear medicine department

Auteur     Elizabeth C Summers
Auteur     Janis L E Brown
Auteur     Peter J Bownes
Auteur     Shona E Anderson
Résumé     OBJECTIVE Occupational radiation doses to the Nuclear Medicine Department staff at Mount Vernon Hospital are routinely measured using optically stimulated luminescence dosemeters for whole-body effective dose and ring thermoluminescence dosemeters (TLDs) for finger dose. In 2002, a project was carried out using LiF:Mg,Cu,P Chinese TLDs to measure the dose to the lens of the eye received by staff during normal working procedures. METHODS Separate pairs of TLDs were worn by staff on their forehead between their eyes while dispensing and releasing in the radiopharmacy, injecting, and when administering I-131 capsules to patients. The dose received was calculated using calibration data from identical TLDs irradiated with Tc-99m, I-131, and the Ir-192 source of a Gammamed High Dose Rate (HDR) treatment unit. Data were collected over a 5-month period and the mean dose to the eye was calculated for each procedure. RESULTS Using a typical yearly workload, the annual dose to the eye for a single member of staff was calculated and found to be 4.5 mSv. CONCLUSION The occupational eye dose limit was, at the time, 150 mSv; therefore, staff were well below the level (3/10th of this limit) that would have required them to be classified. However, there have been large increases in radiopharmacy production and I-131 therapies administered at Mount Vernon in subsequent years. It is therefore expected that the eye dose received by staff will have increased to be significantly higher than 4.5 mSv and will in fact be greater than 6 mSv, which is 3/10th of the proposed new dose limit and would require these staff to become classified workers.
Publication     Nuclear medicine communications
Volume     33
Numéro     5
Pages     476-480
Date     May 2012

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