Influence of transport line material on the molar activity of cyclotron produced [18F]fluoride

Autor: Tapio Viljanen, Stefan Johansson, Olli Eskola, Jörgen Bergman, Nina Savisto, Olof Solin, Julian Grigg, Sarita Forsback, Johan Rajander, Sajinder K. Luthra, Jussi Aromaa
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Zdroj: Nuclear Medicine and Biology. :8-15
ISSN: 0969-8051
Popis: Introduction Production of fluorine-18-labeled radiopharmaceuticals is always associated with the varying levels of the same compound containing stable fluorine-19. In practice, this affects the molar activity (A m ), defined as amount of radioactivity divided by the molar quantity (Bq/mol). We have focused on studying how the material of the transport tubing connecting the cyclotron target chamber to the synthesis device affects the concentration of fluoride in the water arriving to the reaction vessel and subsequently the A m of the fluorine-18 labeled radiopharmaceuticals produced. Methods Batches of irradiated and non-irradiated water were analyzed for fluoride content after being transported via non-fluorinated (PEEK, PP) and fluorinated (PTFE, ETFE) tubing or using no tubing at all. A m for the [ 18 F]fluoride was determined and compared with the A m of [ 18 F]fluciclatide, synthesized from the same [ 18 F]fluoride containing batches of water. Results Significantly higher concentrations of fluoride were seen in irradiated water that was transported in fluorinated tubing compared to non-irradiated water transported in tubing of the same material. This elevation of fluoride concentration is presumably caused by the interaction of ionizing radiation with the fluorinated tubing used between the target chamber and hot cell. Likewise, a significant difference was seen for PEEK tubing (non-fluorinated). This could be due to the fact that fluorine containing compounds are used in the manufacture of PEEK. When using fluorinated tubing for transport of the irradiated water, the resulting fluciclatide concentrations were significantly higher compared to when using non-fluorinated tubing. No significant difference was seen between fluciclatide concentrations when PTFE or ETFE tubing was compared to each other. Using no tubing resulted in lowest fluciclatide concentration. Conclusions Fluorinated tubing is a source of stable fluoride, and A m can be increased by using non-fluorinated transport tubing. Of all the tubing materials studied PP is preferred.
Databáze: OpenAIRE
Externí odkaz: