Abstract: The present invention concerns a device for treatment by hyperthermia, comprising unipolar probes of the implantable type, and comprising circuitry for modifying the distribution forms of the electrical field applied to an aera to be treated.

Abstract: The invention pertains to an apparatus for hyperthermic treatment, especially designed for deep hyperthermia. The treatment apparatus comprises at least two generators operating at different frequencies in such a way as to prevent any phase correlation between the waves delivered by the generators.

Abstract: A multioperation accelerator simulating more especially cobalt radiation. According to the invention, an electron accelerator of average energy and a set of targets and filters are provided so as to obtain at least one penetration curve similar to that of cobalt and other closely related curves.

Abstract: A device is provided for adding to signals of the same frequency but of any phases and amplitudes. The device has two inputs and two outputs. The outputs each deliver a combination of the signals fed to the input. In a particular application, corresponding to reinjection of a recovery signal from a linear accelerator, the combination is an addition. At a first output of the device the whole of the added signal is recovered for reinjection, at a second output of the device the signal is zero. The efficiency of the device is total.

Abstract: The present invention concerns a device for treatment by hyperthermia, comprising unipolar probes adapted to be disposed in an area to be treated of a patient, and comprising vector tubes intended to be implanted in the said area to be treated and to contain, at each hyperthermia session the said unipolar probes.

Abstract: A particle accelerator with frequency correction is provided in which an electromagnetic wave, supplied by a generator, is injected into a cavity through a wave guide. A frequency corrector device comprises two non directional couplers taking directly from said wave guide a standing wave from which an error signal is elaborated and applied to said generator for correcting the frequency of the electromagnetic wave.

Abstract: A self focusing linear charged particle accelerating structure is provided which avoids the radial defocusing effect of the particle beam, more particularly at the outlet of a first accelerating cavity which this structure comprises. Said first accelerating cavity comprises an inlet face and an outlet face which are spaced apart by a distance formed by an accelerating length plus an additional length intended to delay the arrival of the particles at said outlet face.

Abstract: Cyclotron permitting a better utilization of the power when an internal target is used. According to the invention, vertical defocussing coils are arranged along a circular path across which is arranged the target. The elongated, curved coils have the effect of destroying the vertical focusing and consequently widen the beam before impact takes place with the target, so that the latter is not damaged. Application to the production of radioisotopes.

Abstract: The invention provides a block for partially limiting a radiation beam, allowing a first part of this beam to be limited corresponding to a first maximum half angle of opening.This rectilinearly movable block comprises a cylindrical active surface.Because of this active surface, said block defines new limits for the beam without modifying the starting orientation of this active surface in dependence on the positions which it may occupy through its rectilinear movement.

Abstract: An irradiation head permitting the positioning of the area to be treated and the checking of this position. This irradiation head, which is disposed downstream of the neutron target, is provided which a turret carried by a supporting plate and which can rotate about an axis zz perpendicular to said plate. The supporting plate has a central opening A of axis ZZ coinciding with the axis of the useful neutron beam and the axis of the collimator. The turret has three openings a.sub.1, a.sub.2, a.sub.3 which can successively face the opening A in accordance with the axis ZZ. Two of the openings a.sub.1, a.sub.2 are respectively associated with a light source S.sub.1 and an X-ray source S.sub.2 emitting beams of mean paths f.sub.1 and f.sub.2 equidistant with respect to axis zz, these beams being respectively designed for the positioning of the area to be treated and the checking of this position.

Abstract: The particle-accelerating device comprises a charged-particle source, a linear accelerating structure formed by a series of accelerating resonant cavities, an electromagnetic wave generator for emitting a signal to be injected into at least one of the resonant cavities. Means are provided for applying a pulsed high voltage to the particle source and for scanning a target with the pulsed beam of accelerated particles. The electromagnetic wave generator comprises a thermionic tube having a cathode, an anode and at least one grid. At least one of the resonant cavities is electromagnetically coupled to the grid-anode space of the tube.

Abstract: An irradiation apparatus for obtaining an irradiation beam having precise and easily adjustable dimensions. This apparatus comprises more particularly a secondary collimation device having an axis Y--Y, removably fixed to the mobile arm of the irradiation apparatus and comprising a conical pot, two pairs of frames which support collimating plates and are movable about shafts fixed to said conical pot, each of said frames being connected to said conical pot by means of a compass system formed from legs hinged together about shafts. With said frames are associated mobile antipenumbra plates whose position is checked by means of a feeler system.

Abstract: The invention discloses a resonant system for accelerating charged particles of the cyclotron type allowing this cyclotron to operate successively at two resonant frequencies f.sub.1 and f.sub.2 =mf.sub.1 (m=2 for example) without modification of the structure, this resonant system comprising a sealed enclosure connected to ground and in which is disposed at least one hollow electrode or "Dee" having the shape of a sector, the enclosure and the "Dee" being associated with a resonant element formed from a tubular external conductor closed at one of its ends by a metal plate and whose other end opens into the enclosure and, placed inside this external conductor, two internal conductors connected together, at one of their ends, by means of a connecting element determining with the external conductor a capacity C variable in value, for adjusting the operating frequencies f.sub.1 and f.sub.2 of the cyclotron and more particularly the ratio f.sub.1 /f.sub.2.

Abstract: A microwave drying device for drying products in the form of grains, comprising a microwave source, at least one waveguide coupled electromagnetically to the microwave source, means for injecting into this waveguide the product to be treated, means for driving this product in the waveguide, means for causing a forced circulation of dry air in the waveguide, means for discharging the air charged with the humidity given up by the product to be treated, and means for collecting the dried product in this waveguide, wherein the waveguide is closed on itself so as to form a ring, a part of this waveguide forming a channel through which the product to be treated may pass, said channel being connected at its ends to pipes for feeding therein and removing therefrom the product, these pipes forming cut-off waveguide.

Abstract: An achromatic magnetic deflection device for deflecting by an angle .phi. between .pi. and 2.pi. a beam of charged accelerated particles having different momentum. This device comprises an electromagnet provided with pole pieces delimiting three contiguous sectors, the whole of these sectors, having an axis of symmetry XX, presenting flat input E and output S faces and common faces F.sub.1 and F.sub.2 in an arc of a circle, the position, the radius of curvature of these faces F.sub.1, F.sub.2 as well as the value of the magnetic induction in the sectors being chosen so that the different paths are substantially orthogonal both to faces F.sub.1, F.sub.2 and to axis XX.

Abstract: An apparatus for thermal treatment of the human body, using electromagnetic waves (200 to 2500 Mc/s) and radiometric receivers for monitoring and possibly controlling the temperature reached by the living tissues. A generator at ultra high frequency delivers a power of about one Watt into a coaxial cable terminated by a probe emitting electromagnetic waves in the organ to be heated by dielectric losses in the medium. A multichannel receiver, switched at intervals, analyzes the radiation reemitted by the living tissues through the probe, then utilized as a receiving antenna. The temperature reached in a region surrounding the probe is deduced therefrom and can be utilized for controlling the power emitted through a servocontrol system.

Abstract: Magnetic mirror enabling a beam F of charged particles to be reflected along its incident path whatever the value W of the momentum of said particles. This magnetic mirror includes a first magnetic deflector having polepieces of circular shape, a second and a third magnetic deflector provided respectively with pairs of polepieces arranged symmetrically with regard to an axis XX coinciding with the mean incident path of the beam F, the entry and exit face of these polepieces being determined in such a way that the beam F emerging from the second magnetic deflector is perpendicular to the symmetry axis of the mirror and that the vertical divergence of the beam is compensated.

Abstract: A monitoring system transparent to ionizing radiation, designed for measuring the position, intensity, uniformity and directivity of a radiation beam, comprises two or three superimposed ionization chambers respectively provided with respective disk electrodes. One electrode is of smaller area than the other electrode or electrodes, the latter being substantially equal to the cross-sectional area of the radiation beam. Circuits for processing the signals furnished by the different electrodes are associated with comparators and with a safety system which readjusts the beam or deactivates the radiation source in the event that certain "threshold" values are exceeded, indicating a deviation of the beam from a centered position.

Abstract: Apparatus for irradiating the two opposite faces of a target by means of a scanning beam and comprising a magnetic deflection system formed by an electromagnet provided with two pole pieces disposed downstream of the target to be irradiated, the length of the pole pieces corresponding to the amplitude of the scanning beam in such a way that, if .theta.=.theta..sub.1 +.theta..sub.2 is the total scanning angle, the scanning beam of angle .theta..sub.1 impinges on one face of the target, while the scanning beam of angle .theta..sub.2 =.theta.-.theta..sub.1 is deflected in the magnetic deflection system and irradiates the other face, the polepieces having a face, so-called useful face, facing the other face of the target and comprising several sections with different curvatures for obtaining a reflected beam substantially perpendicular to this other face of the target.

Abstract: Neutron-based radiotherapy apparatus comprising a linear charged-particle accelerator which delivers a beam of accelerated electrons, a target intended to be bombarded by the beam of accelerated electrons for emitting neutrons under the impact of that beam, means for cooling the target, means for eliminating parasitic radiations, and a collimation system for the useful beam of neutrons. The electron accelerator may be arranged either on the inside or on the outside of the rotating arm of the neutron-radiotherapy apparatus.