SU-E-I-85: Evaluation of a Solid-State Dosimeter Module for Measuring Nuclear Medicine Radionuclides

Medical Physics
R Wendt

Abstract

A recently introduced solid-state dosimeter module (UDOS001, Teledyne Microelectronic Technologies, Los Angeles, CA) requires only external power (e.g., from two nine-volt batteries in series) and a battery- powered data recorder to assemble a compact, portable dosimeter. This device was developed for radiation detection and monitoring of a wide range of radiation types. It has a nominal minimum energy of 100 keV. The present study sought to determine its suitability for measuring the dose from radionuclides used in nuclear medicine. Three radionuclides (initially 4.77 mCi of F-18, 3.86 mCi of I-131, and 12.4 mCi of Tc-99m) were measured at a distance of one meter and at several different angles of incidence. The most sensitive analog output of the dosimeter was digitized by a battery-powered data logging device (Track-It 5VDC, Monarch Instrument, Amherst NH). These data were transferred from the data logger into a Windows 7 personal computer, formatted as an Excel 2010 spreadsheet and converted from voltage to dose using the manufacturer's nominal calibration factor of 14 urad/19.5 mV step. The dose rate was determined from the slope of a linear fit to the cumulated dose as a function of time. The nominal calibration of the do...Continue Reading

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