Gaseous detector calibration and efficiency filter evaluation for radiochemistry facility

ICRP 103 guidelines and EURATOM Directive 2013/59 require close monitoring of radioactive emissions, ensuring that public exposure remains below 10 $\mu $Sv/year. To meet these limits, reliable and accurate monitoring systems are essential. This study presents a method for calibrating large-area proportional counters used for monitoring the emissions of $^{18}F$ and $^{11}C$ gases during the production of PET radiopharmaceuticals. The proposed method makes it possible to accurately determine the calibration factor for measuring the air activity concentration. In addition, the efficiency of absolute and activated carbon filters in reducing radioactive emissions was evaluated. The results showed a filtration efficiency of 98$\%$. This underscores the importance of combining detection system with efficient air filtration to ensure that radionuclide production facilities remain within regulatory limits, protecting both public health and the environment.