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Published on: May 29, 2017
Calibration of ionization chamber for ¹⁸F and ⁶⁸Ga
Carlos J da Silva1, Estela M de Oliveira1, A Iwahara1
1Laboratório Nacional de Metrologia das Radiações Ionizantes (LNMRI), Instituto de Radioproteção e Dosimetria (IRD), Comissão Nacional de Energia Nuclear (CNEN), Av. Salvador Allende, s/no-Barra da Tijuca, CEP 22783-127, Rio de Janeiro, Brazil.
Abstract:
In order to maintain the results of primary activity standardizations carried out in 2011 the LNMRI has determined the calibration factors for a pressurized 4π-ionization chamber for the nuclides (18)F and (68)Ga. This ionization chamber is coupled to a 6517A Keithley electrometer which is controlled by a homemade LabVIEW program. This paper will describe the main issues related to the calibration of an ionization chamber system for positron emitters and short half-life radionuclides such as timing, current measurement, background, decay, and (226)Ra check source measurements.
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