Dose Buildup Factor of a60Co Cylindrical Source with a Shell Shaped Shield

Analysis of a solid state wave gyroscope with thin shell cylindrical resonator and calculation of its conversion factor

In this work the equations of motion of a Solid State Wave Gyroscope (SWG) with rotary thin cylindrical shell resonator is analyzed using the shell and plates elasticity theory. The gyroscope conversion factor found in this analytical study corresponds with the experimental results obtained and listed in the References. The function of the SWG to measure the angular velocity or the rotating ang...

بررسی مکان و راستای آشکارساز جهت مینیمم نمودن ضریب انباشت شار پرتوهای گاما

The purpose of this study is to select the best place for the detector towards shield and the gamma source which have the least flux buildup factor of the photon. In this research, the flux buildup factor of gamma rays was calculated by using of MCNP-4C code for cylindrical sources 137Cs, 60Co, 16N coaxial shields made up of aluminum, iron and lead with a constant thickness 1.55 cm in detec...

Modeling of Vibration of a Fluidized Bed Cylindrical Shell

A charged rotating cylindrical shell

We give an example of a spacetime having an infinite thin rotating cylindrical shell constituted by a charged perfect fluid as a source. Then we disscuss the energy conditions and we show that our spacetime contains closed timelike curves. Trajectories of charged test particles both inside and outside the cylinder are also examined. Expression for the angular velocity of a circular motion insid...

محاسبه ی ضرایب انباشت چشمه ی گاما با طیف انرژی پیوسته برای آب، آهن و سرب به وسیله ی کد مونت کارلو

The exposure buildup factors are important for determining the shield thickness of gamma and X-ray. Without taking this factor into account, the estimated thickness of the shield is less than what is expected which leads to an excessive received radiation exposure of staffs or patients. Given that the exposure buildup factor for the monoenergetic homogenous point sources have been calculated by...