The Study Of A New Type Of Shielding Materials On The γ-ray

With the application of nuclear technology development, radioactive-rays are used widely that brought injury and damage to the the human body and environment. It is gradually being recognized by people. Contact with radioactive rays frequently resulting in burnning the skin, hair loss, eye pain, leukopenia and even symptoms of myeloma. So protection of these rays on a variety of shielding materials research has become a very important and urgent issue, as well as the results achieved. Principle-ray shielding is that:when rays penetrate many materials, the strength will be weakened. A certain thickness shielding material can weaken the strength of rays. Between the radiation source and the human body ,we can provide sufficient thickness of shielding material to reduce the radiation level to ensure personal safety and to achieve the purpose of protection. The gist of shielding is put the effective absorption of a ray shielding materials between ray source and the body. These materials onγ-ray shielding effect each are not identical. People usually adopts lead do shielding materials. Nature, the three lead isotopes 206Pb, 208Pb, 207Pb are actinide final decay products respectively, the three natural radioactive series of uranium series, thorium University and actinium series .So we think that lead is toxic .In recent years, to prevent pollution and to protect the environment, people puts forward the development of the radiation shielding materials instead of lead.This work used NaI(Tl) scintillation detectors. and Automatic calibration to measure absorption coefficient of different materials.γ-ray study of tungsten-nickel alloy in the attenuation law for the promotion of tungsten-nickel alloy used to provide a theoretical basis for. Naturalγ-ray interaction with the material of the three main forms: photoelectric effect, Compton scattering and electron pair effect. As the result of three effects,γ-ray attenuation through the material occurred (absorption), the total attenuation coefficient of the three and should be. Narrow beam of single-energy rays, in penetrating the material, its strength will be reduced. This phenomenon is known as-ray absorption. Ray intensity exponential decay law, if the absorption curve in the semi-logarithmic plot the coordinates on paper will draw a straight line, the slope of this straight line is the absorption coefficient .Conclusions from this work, we can see, tungsten-nickel alloy for the same energyγ-ray shielding effect is far better than the effect of lead shielding. For the special needs of occasions in the choice of tungsten-nickel alloy as a shielding material ,this work provides an experimental basis for reference in the field of radiation protection.The same medium on theγ-ray energy absorption coefficient is about the incident light and medium sub-atomic number. And it does not change with the increase of media thickness. Theγ-ray absorption coefficient decreases gradually with the gradually increased incidentγ-ray energy for same medium. In addition based on X-ray absorption coefficient, theγ-ray difference algorithm was verified and found thatγ-rays also meet the basic law.Due to the limited level and scientific research work experience in working of the author, there are many areas in need of improvement. According to the X-ray absorption coefficient difference algorithm, we found gamma rays also meet this law.. Due to limited experimental conditions, we can not carry out the different elements of the experiment. This is the need for future work to improve. In the design of experimental apparatus, how comprehensive and effective shield ray entering the detector and how ensure the accuracy of the measurement results is need to improve.