Abstract: A method is disclosed for minimising the diameter of the magnet poles of a cyclotron system for production of radioactive tracers. The method selects an operation mode having vz defined below the critical resonance value of vz=½ and chooses a valley technique having shallow valleys by selecting a first magnet pole parameter defining a valley gap accepting a narrow spaced RF electrode system and size facilitating a vacuum conductance necessary for obtaining a low enough pressure. The method then defines a second magnet pole parameter by setting a sector gap size. The magnetic azimuthal field shape is transformed from being “square-wave”-shaped to becoming approximately sinusoidal by increasing the magnetising field. Then an average magnetic field is calculated from the increased magnetising field and the first and second magnet pole parameter. A pole diameter can then be established to obtain a most compact design of the electromagnet for a cyclotron system.

Abstract: A device is disclosed for simple and quick disconnection of a target assembly at a cyclotron accelerator producing an ion beam irradiating the target assembly for PET radioisotope production. The device consists of a target body presenting a target space for introduction of target media to be irradiated by the ion beam from the cyclotron accelerator. The target body is separated into three portions by means of two separation window foils. The first separation window separates the internal space of a first body portion from a further internal space portion of a second target body portion and the second separation window separates a further internal space of the second target body portion from an internal space of a third target body portion being in communication with the vacuum space of the cyclotron.

Abstract: A method and a system for obtaining a proper resonance of the RF electrodes when using a preset or predetermined stable frequency oscillator in a cyclotron accelerator without using mechanical tuning devices. In order to maintain a high RF electrode voltage during operation the RF electrode system resonance is monitored and the frequency of the stable frequency generator is controlled by a feedback system continuously monitoring the matching of the oscillator output frequency and the resonance of the RF electrode system. Necessary small adjustments of the stable oscillator frequency to maintain a maximum matching to the resonance frequency of the RF electrode system are obtained by means of the feedback system to the stable oscillator. The feedback system relies on measured values obtained by a load phase sensor monitoring the output of the final RF power amplifier.

Abstract: An apparatus is disclosed that forms a basic integrated radiation shield for a PET isotope production system to create a safe environment. The apparatus and the system combine several subsystems to provide a high degree of integration and a nice aesthetic impression. The apparatus contains a cyclotron system and contains integrated target media handling for gas targets and water dispensing systems for water targets. A compartment including first and second additional radiation shields, respectively, that contains additional processing systems. The apparatus forms a closed radiation-proof system by means of a casing formed of four molded sections. A first and second section constitute a main body containing;the cyclotron system and a third and a fourth section constituting a pair of tight doors for encompassing the cyclotron into a sealed radiation shield. The first section additionally contains a Waste Gas Delay Line embedded in its shielding material.