Calibration of surface contamination monitors for the detection of iodine incorporation in the thyroid gland

Radiat Prot Dosimetry. 2011 Mar;144(1-4):505-9. doi: 10.1093/rpd/ncq419. Epub 2010 Dec 11.

Abstract

In Switzerland, individuals exposed to the risk of activity intake are required to perform regular monitoring. Monitoring consists in a screening measurement and is meant to be performed using commonly available laboratory instruments. More particularly, iodine intake is measured using a surface contamination monitor. The goal of the present paper is to report the calibration method developed for thyroid screening instruments. It consists of measuring the instrument response to a known activity located in the thyroid gland of a standard neck phantom. One issue of this procedure remains that the iodine radioisotopes have a short half-life. Therefore, the adequacy and limitations to simulate the short-lived radionuclides with so-called mock radionuclides of longer half-life were also evaluated. In light of the results, it has been decided to use only the appropriate iodine sources to perform the calibration.

MeSH terms

  • Calibration
  • Equipment Contamination*
  • Equipment Design
  • Humans
  • Iodine Radioisotopes / analysis*
  • Models, Statistical
  • Occupational Exposure / prevention & control*
  • Phantoms, Imaging
  • Polyethylene / chemistry
  • Radiation Monitoring / instrumentation
  • Radiation Monitoring / methods
  • Radiation Protection / instrumentation
  • Radiation Protection / methods
  • Radionuclide Imaging
  • Reproducibility of Results
  • Sodium Iodide / chemistry
  • Switzerland
  • Thyroid Gland / diagnostic imaging*
  • Thyroid Gland / radiation effects

Substances

  • Iodine Radioisotopes
  • Polyethylene
  • Sodium Iodide