Dose calibrator linearity test: (99m)Tc versus (18)F radioisotopes

Radiologia brasileira
José WillegaignonCarlos Alberto Buchpiguel

Abstract

The present study was aimed at evaluating the viability of replacing (18)F with (99m)Tc in dose calibrator linearity testing. The test was performed with sources of (99m)Tc (62 GBq) and (18)F (12 GBq) whose activities were measured up to values lower than 1 MBq. Ratios and deviations between experimental and theoretical (99m)Tc and (18)F sources activities were calculated and subsequently compared. Mean deviations between experimental and theoretical (99m)Tc and (18)F sources activities were 0.56 (± 1.79)% and 0.92 (± 1.19)%, respectively. The mean ratio between activities indicated by the device for the (99m)Tc source as measured with the equipment pre-calibrated to measure (99m)Tc and (18)F was 3.42 (± 0.06), and for the (18)F source this ratio was 3.39 (± 0.05), values considered constant over the measurement time. The results of the linearity test using (99m)Tc were compatible with those obtained with the (18)F source, indicating the viability of utilizing both radioisotopes in dose calibrator linearity testing. Such information in association with the high potential of radiation exposure and costs involved in (18)F acquisition suggest (99m)Tc as the element of choice to perform dose calibrator linearity tests in centers th...Continue Reading

References

Dec 31, 2005·Radiation Protection Dosimetry·M M NinkovicF Adrovic
Jul 1, 2008·Journal of Nuclear Medicine : Official Publication, Society of Nuclear Medicine·Pat Zanzonico
Feb 5, 2010·European Journal of Nuclear Medicine and Molecular Imaging·UNKNOWN EANM Physics CommitteeRigobert Klett

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