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|Title||Medical Effects of Radiation Interactions|
|Title in Arabic||التاثيرات الطبية لتفاعلات الاشعة|
Radiation is naturally present in our environment and exist since the birth of this planet. It comes from outer space (cosmic), the ground (terrestrial), and even from within our own bodies. It is present in the air we breathe, the food we eat, the water we drink, and in the construction materials used to build our homes. low doses – less than 10,000 mrem (100 mSv) – spread out over long periods of time (years) don't cause an immediate problem to any body organ. The effects of low doses of radiation, if any, would occur at the cell level, and thus changes may not be observed for many years (usually 5-20 years) after exposure. Although radiation may cause cancers at high doses and high dose rates, currently there are no data to establish unequivocally the occurrence of cancer following exposure to low doses and dose rates – below about 10,000 mrem (100 mSv). In this work we studied interaction of different radiations types with matter; we calculated the stopping power (in MeV cm2/g) from the theory of Bethe-Bloch formula as giving in the reference  , also Range and doses will be calculated. This has been done for different target materials in biological human body substances such as water, bone, muscle and tissue and different energies of the ions and electrons. All these calculations were done using different programs; SRIM , STAR and Matlab, the results will be shown for Range Vs energy, and stopping power vs energy at the last chapter. The stopping power in some biological compounds for electrons was calculated over the energy range from (10-2MeV to 103 MeV). Total stopping power was obtained by summing the electronic (collisional) and radiative stopping power of the target materials, and then employing the continuous slowing down approximation (CSDA) to calculate the path length (Range). The total stopping power is proportional to Z2 ,Z/A and I, increases rapidly at low energies, reaches a maximum and decreases gradually with increasing energy. Finally doses also calculated using Monte Carlo simulation techniques , VMS, these photons, in the form of gamma rays or X-rays, have enough energy to cause ionization in the human body, and can therefore cause a radiation dose, some results for dose calculation will be shown for different cases using the VMS code.
|Publisher||الجامعة الإسلامية - غزة|
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