A refiner plate carrier for use in refining lignocellulosic material including a mounting mechanism for mounting to a refiner plate segment and not a rotor or stator disk. Particularly, this invention provides a method of preparing a 188Re-tricarbonyl precursor by reacting perrhenate with borane-ammonia, potassium boranocarbonate and phosphate in the presence of borohydride exchange resin as a reducing agent, and a method of preparing a 188Re-tricarbonyl complex by reacting the 188Re-tricarbonyl precursor with a ligand. After passing through a volume of atmosphere to be probed, and reflection, the radiation is received and the dispersive influence, for instance, on the distance measurements, is calculated and corrected. In one example embodiment, a forward LBG model includes DWNL module followed by the SSNL module. The second pressure criterion includes a decrease of pressure inside the tank below a predetermined pressure level.