Accsys Technology, Incorporated

Hitachi, Ltd.

Robert W Hamm

Takashi Okazaki

James M Potter

Hirofumi Seki

Kenneth R Crandall

Kazuki Tsuchida

A radioisotope production apparatus includes: a linear accelerator for accelerating an ion beam and irradiating a target with the ion beam, radio frequency power supplies for supplying radio frequency waves through coaxial tubes and the linear accelerator, a target shield member containing the target, a first radiation shield member covering the linear accelerator, and a movable second radiation shield member covering the side of target shield member of the linear accelerator between the first radiation shield member and the target shield member. The first radiation shield member is movably divided in opposite directions, respectively, of the axial direction of the linear accelerator from the base point of the connection point of the coaxial tube connected to the linear accelerator.

Radioisotope production apparatus and radiopharmaceutical production apparatus

A compact proton-beam therapy linac utilizing a linear, cascaded organization including a proton source, a radio-frequency-quadrupole (RFQ) linac coupled to the output of the source, a stepped-frequency (around 500- to around 100-MHz), low-peak-beam-current (around 100- to around 300-.mu. A) drift-tube linac (DTL) coupled to receive the output of the RFQ, and a plural-stage, low-peak-beam-current stage-switchable, side-coupled linac (SCL) coupled to the output of the DTL for producing the ultimate output proton-therapy beam.

Proton-beam therapy linac

A variable frequency RFQ linear accelerator has a sequence of variable inductance coils connected at intervals along the electrode vanes, such that each coil together with the corresponding section of the vanes forms an LC resonant circuit having a resonant frequency equal to the operating frequency of the accelerator. The variable inductance coils are each comprised of a helical bifilar coil, with each filament of a given coil being connected to one pair of vane electrodes on opposite sides of the beam axis, and a movable shorting bar is provided for each bifilar coil to vary the inductance. The helical bifilar coils in adjacent sections are disposed on opposite sides of the beam axis, the axes of the coils on either side being parallel to the beam axis and mutually coincident. Drive shafts extend along these axes through the wall of the vacuum vessel, with control rods extending radially outward to each of the shorting bars, and a ganging mechanism is provided to control all of the shorting bars so that the LC circuits all maintain the same resonant frequency. The power supply is connected to the vane electrodes through a capacitive impedance. Mode switches are further provided at the ends of the bifilar inductance coils to avoid interfering resonances from the sections of the coils beyond the shorting bars.

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Pleasanton, CA, United States of America

Robert W Hamm