نتایج جستجو برای: stopping power
تعداد نتایج: 499755 فیلتر نتایج به سال:
The energy loss of heavy ions in thin Mylar and nickel foils was measured accurately using fission fragments from 239Pu(nth,f), mass separated by the Lohengrin separator at ILL. detection setup, placed focal plane enabled to measure precisely kinetic difference selected after passing through sample. From these data, stopping powers layers were extracted compared calculations. Whereas large devi...
Penetration and estimation of absorbed dose of electron in soft tissue is investigated in this paper. Neck phantom was simulated by MCNPX code version 2.6. The Phantom was included skin, adipose, neck tissue, neck bone and thyroid glands. Radiation source kept near to the skin surface and located in the back of the neck. Electrons were collided perpendicular to the skin surface. The curves show...
Absolute dosimetry with ionization chambers of the narrow photon fields used in stereotactic techniques and IMRT beamlets is constrained by lack of electron equilibrium in the radiation field. It is questionable that stopping-power ratio in dosimetry protocols, obtained for broad photon beams and quasi-electron equilibrium conditions, can be used in the dosimetry of narrow fields while keeping ...
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