Electron and photon spread contributions to the radiological penumbra for small monoenergetic x-ray beam ( ≤ 2 MeV )

The particle internal clock conjectured by de Broglie in 1924 was investigated in a channeling experiment using a beam of ∼80 MeV electrons aligned along the 110 direction of a 1 μm thick silicon crystal. Some of the electrons undergo a rosette motion, in which they interact with a single atomic row. When the electron energy is finely varied, the rate of electron transmission at 0°shows a 8% dip within 0.5% of the resonance energy, 80.874 MeV, for which the frequency of atomic collisions matches the electron's internal clock frequency. A model is presented to show the compatibility of our data with the de Broglie hypothesis.In a previous publication [1], we showed data which can be interpreted as a manifestation of the particle internal clock postulated by L. de Broglie in 1924. In the present paper we shall report again this result in the light of a phenomenological calculation that we used as a guide to design the experiment and understand its significance.At the beginning of quantum mechanics, L. de Broglie [2, 3] associated a particle of mass m 0 in its rest frame with an internal frequency ν 0 = m 0 c 2 /h and a wave

International audienceA key point in the quality control of ion therapy is real-time monitoring and imaging of the dose delivered to the patient. Among the possible signals that can be used to make such a monitoring, prompt gamma-rays issued from nuclear fragmentation are possible candidates, provided the correlation between the emission profile and the primary beam range can be established. By means of simultaneous energy and time of flight discrimination, we could measure the longitudinal profile of the prompt gamma-rays emitted by 73 MeV/u carbon ions stopping inside a PMMA target. This technique allowed us to minimize the shielding against neutrons and scattered gamma rays, and to find a good correlation between the prompt gamma profile and the ion range. This profile was studied as a function of the observation angle. By extrapolating our results to higher energies and realistic detection efficiencies, we showed that prompt gamma-ray measurements make it feasible to control in real time the longitudinal dose during ion therapy treatments