Thyroid monitoring system for measurement of iodine content in thyroid of occupationally exposed personnel

摘要: Two monitoring systems for measurements of 131 I and 125 content in the thyroid are presented: Stationary Unit measuring with a low limit detection Mobile situ I. The study counting geometry optimisation showed that mobile unit's unshielded detector required shorter thyroid-detector distance about 15 cm. This ensured lower at possible local background fluctuation. results thyroids staff members working radioiodine four Departments Nuclear Medicine do not show any correlation between measured levels risk categories. Instead, there significant differences averages contents particular medical unit. These necessarily depend on usage unit but rather specific complex work conditions, training so on. Average Effective Dose Equivalent values all units below 10% occupational exposure 50 mSv.y -1 .