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Register a new userRadiation Damages in Crystalline Structure
التشوهات الاشعاعية في البنى البلورية
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Tishreen University ورقة بحثية
Publication date
2016
fields
Physics
and research's language is
العربية
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Shamra Editor
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تؤدي عملية تشعيع عينة كريستالية إلى حصول تشوهات في هذه العينة ، و تنتج هذه التشوهات عن انزياح الذرات من أماكنها النظامية في الشبكة و توضعها في أماكن غير نظامية كما تنتج هذه التشوهات ، لكن بمقدار أقل بكثير ، من جسيمات الحزمة ( الجسيمات الغريبة ) المتوضعة داخل العينة . يتعلق عمق و مقدار هذه التشوهات بمتحولات التشعيع، و يمكن تحديد مقاطع التوزع العمقي للتشوهات بطريقة (RBS (Rutherford Back Scattering ، لكن حساسية هذه الطريقة غير كافية لتحديد التوزع العمقي لكثافة جسيمات الحزمة المتوضعة داخل العينة . يتعلق عمق توضع قمة مقطع RBS بشدة بزاوية توجيه قناة ما من العينة بالنسبة إلى حزمة التشعيع و كذلك بنوع القناة.حيث تنزاح قمة مقاطع RBS في التشعيع القنوي نحو العمق مقارنة مع نظيرتها في التشعيع العشوائي و يتعلق مقدار هذا الانزياح بمتحولات التشعيع . يزدادارتفاع قمة مقاطع RBS مع زيادة جرعة التشعيع القنوي ، و يسمى الارتفاع الذي لا يمكن تجاوزه بحالة الأمورف و الجرعة الموافقة بجرعة الأمورف و تتعلق جرعة الأمورف أيضا بمتحولات التشعيع و خاصة درجة حرارة العينة.
The radiating process of a crystalline sample cause damages in this sample .These damages composed mostly of displaced sample atoms from their regular position in lattice, and placed in irregular position, and of very less quantity from some beam particles ( strange particles ) , that placed inside of this sample. The depth and amount of these damages are correlating with radiating parameters. It's possible to estimate the depth distribution profiles of damages by RBS-Method, but the sensitivity of this method is not enough to determine the depth distribution of concentration of beam particles , that placed inside of the sample . The placement depth of RBS-Profiles top is strongly correlated with orientation angle of a sample's channel relative to radiating beam also to kind of channel ,whereas the RBS-Profiles top displaces in depth , in channel radiation compare with its counter part in random radiation and the displacement value correlates with radiation parameters The height of RBS-Profiles top increase by increasing of radiation dose, and height that can't be survived called amorph state , and the agreeing dose called ,amorph dose , the amorph dose correlates also with radiation parameters, special sample temperature.
References used
WILSON,R.G. Rangers and Depth Distribution of 200 keV He Ions Channeled in Si,Ge and GaAs Crystals. J Appl Phys ,61(7) ,1987, 134-139
MOZURNDER,A; HATANO,Y . Charged Particle and Photon Interactions with Matter . Marceld Ekkeirnc, USA, 2004,412
TAVERNIER,S. Experimental Techniques in Nuclear and Particle Physics.1st,Springer-Verlag ,Berlin Heidelberg ,2010,44
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Zinc Chromate was synthesised by Co-precipitation
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Set temperature synthesis at 250 ℃ .
The thin films of TiO2 were prepared by the Sol-Gel, on glass
subtracts by using the following initial solutions: trichlorethylene
titanium, ethanol, sodium hydroxide and hydrochloric acid and
distilled water. The films were annealed at temperatur
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400-500)c° for 1 hour. The structure of the prepared and annealed
films were studied by XRD. The XRD rusltes showed that the films
prepared crystallize according to orthorhombic Structure.Lattice
constants were calculated and it was found that it was consistent
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The systematic destruction and devastation of the crisis in Syria since March 2011 aimed at
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transport sector suffered heavy economic losses in its infrastructure and transportation.
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the transport sector was reviewed before the crisis.
In view of the importance of this sector and its key role in the reconstruction, there was a
package of proposals and visions that were put forward for the reconstruction of the
infrastructure of the sector itself as a priority and strengthening the role of this sector in the
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geographical position as a transport hub leading to an increase in economic growth rate To
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Refusion the boundaries of weld's reinforcement was done using TIG
without filler metal .The mechanical properties & micro-structure of
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في عام 1895 اكتشف الفيزيائي Roentgen الأشعة السينية (x-rays) وفي عام 1912قام الفيزيائيون Von Laue و Friedrich و Knipping بتسليط الأشعة السينية على التوتياء ودرسوا البنية البلورية للتوتياء
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