title: Comparison of calibration results for an extrapolation chamber obtained with different 90Sr+90Y secondary standard sources.
abstract: Two secondary standard systems of beta radiation were used to calibrate a PTW extrapolation chamber Model 23391. Three (90)Sr+(90)Y sources of different activities were used in this calibration procedure. Medium-term stability of the response of the chamber was also studied. The calibration was performed with and without field-flattening filters. The relative standard deviation of the obtained calibration factors was 8.3% for the aluminum collecting electrode and 4.1% for the graphite collecting electrode.
authors: Instituto de Pesquisas Energéticas e Nucleares, IPEN-CNEN/SP, São Paulo, SP, Brazil.
authors: Patrícia L
authors: PL
authors: Antonio
authors: Valdir S
authors: VS
authors: Carvalho
authors: Linda V E
authors: LV
authors: Caldas
mesh_terms: D000535:Aluminum; D001610:Beta Particles; D002138:Calibration; D004566:Electrodes; D005374:Filtration / Q000295:instrumentation; D006108:Graphite; D011874:Radiometry / Q000379:methods* / Q000592:standards; D015203:Reproducibility of Results; D013326:Strontium Radioisotopes / Q000592:standards*; D015021:Yttrium Radioisotopes / Q000592:standards*
chemical_list: D013326:Strontium Radioisotopes; D015021:Yttrium Radioisotopes; D006108:Graphite; D000535:Aluminum