To operate the apparatus, one adjusts the controls of the resistance 29 and the variometer to the desired rhythm; in medical applications, this is advantageously the subject's cardiac rhythm:  This rhythm is thus imposed upon the whole installation.  The cathode 13 emits toward the left a stream of positively charged particles 2, which are concentrated by the electromagnet 13 and accelerated by the coils 14, 15 and 16 and by the cyclotron 4.  Superimposed on this particle stream in the duct 8 is the electromagnetic radiation from the magnetron 7, which is adjusted to the wavelength found by experience to be most appropriate to the cells which are to be penetrated, e.g., 14 cm for the liver and 19.5 cm for the spleen.  The resulting radiation is deflected, directed and accelerated in tube 9 and is directed by way of the base of this tube toward the target to be penetrated. 

              It must be noticed that the magnetic field of the coils 15, 16 and 26 is modulated, by means of the converter assembly 31, at a frequency adjustable between 300 and 900 Hz.  This modulation has the effect of concentrating the particles, that is to say to detach them from the walls of the tubes, and it also permits an appreciable saving in weight of the iron cores of the coils.  One chooses the highest frequencies (i.e., around 900 Hz ) when one wishes to produce hard radiation at the exit of tube 9, and the lower frequencies for soft radiatiot[sic] (radiation?). 

              The unidirectional magnetic fields of the coils 4c of the magnetron (sic) (cyclotron?) and the accelerator coils 14 as well as the electric field of electrodes 25, 25a, 25b, are modulated by the oscillatory circuit 35 at a chosen wavelength between 1 m and 18 m.  In medical applications notable one selects the wavelength that best suits the organ to be treated or its surroundings, such as muscle.  As already indicated, experience with diathermy makes it possible to determine the most suitable wavelength. 

              It must be noted that the resulting radiation already posesses, in tube 8 (Fig. 1) a considerable penetrating force.  One could therefore use the assemblage described by omitting tube 9 and terminating the cavity at the end of tube 8 by means of a glass or quartz base, the resulting radiation being accelerated and directed, for example, immediately upstream from the base, by a final coil (not shown) surrounding tube 8,  However, tube 9 appreciably improves the results. 

              Figs. 5 and 6 represent another mode of realizing the assemblage in accordance with the invention, in which the elements playing the same role are indicated by the same signs as in Figs. 1 and 3, modified by primes. 

              The arrangement of the connecting ducts of Fig. 5 in relation to tubes 1' and 9', to the magnetron 7' and the cyclotron 4', is different from that of Fig. 1 and has been used successfully by the applicant.  The waveguide 6' of the magnetron 7' opens into the end of tube 1' and the duct 3' carrying the resulting radiation, divides into two branches:  Branch 36 which conducts the radiation directly to tube 9', and branch 37 which conducts it to the cyclotron 4'.  This blocks the electromagnetic radiation and accelerates the stream of particles which is passed by way of duct 38 to the tube 9'.