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Radiation Protection Dosimetry Advance Access published online on July 6, 2006
Radiation Protection Dosimetry, doi:10.1093/rpd/ncl084
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org
Received January 31, 2006
Revised May 23, 2006
Accepted May 29, 2006

SCIENTIFIC AND TECHNICAL PAPER

RADIATION EXPOSURE FOR ‘CAREGIVERS’ DURING HIGH-DOSE OUTPATIENT RADIOIODINE THERAPY

Christopher J. Marriott 1, Colin E. Webber 1 *, and Karen Y. Gulenchyn 1

1 Department of Nuclear Medicine, Hamilton Health Sciences, 1200 Main Street West, Hamilton, Ontario, Canada L8N 3Z5

* To whom correspondence should be addressed.
Colin E. Webber, E-mail: webber{at}hhsc.ca


  Abstract

On 27 occasions, radiation doses were measured for a family member designated as the ‘caregiver’ for a patient receiving high-dose radioiodine outpatient therapy for differentiated thyroid carcinoma. For 25 of the administrations, patients received 3.7 GBq of 131I. Radiation doses for the designated caregivers were monitored on an hourly basis for 1 week using electronic personal dosemeters. The average penetrating dose was 98 ± 64 µSv. The maximum penetrating dose was 283 µSv. Measured dose rate profiles showed that, on average, one-third of the caregiver dose was received during the journey home from hospital. The mean dose rate profile showed rapid clearance of 131I with three distinct phases. The corresponding clearance half-times were <1 h, 21 h and ~8 d. These components were associated, respectively, with the drive home, the clearance of radioiodine from an athyreotic patient and small quantities of 131I contaminating the home.


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