دراسة تأثير أشعة غاما على تشتت قرينة الانكسار لأغشية رقيقة من البوليسيترين وفق نموذجي ويمبل – ديدمينكو وسيللماير
Abstract
Two membranes of polysterene were prepared, pure and radiated with Gamma Rays, by casting method.
The study included recording the transmittance (T) spectrum in the range (400-900)nm, then calculating the values of the absorbance (A), the reflectance (R), the absorption coefficient ( 14خ±"> ), extinction coefficient (Ko), and refractive index (no) for the polysterene membranes before and after the irradiation.
The effect of Gamma Rays on the refractive index dispersion by Wemple-Didomenico and Sellmeier models was studied.
It was observed that ɣ Rays radiation lead to an increase in the transmittance (T) and a decrease reflectance (R) and absorbance (A), also a decrease in the refractive index values (no).
Some special parameters in the Wemple-Didomenico model were calculated, like The Single Oscillator Energy (Eo), and Dispersion Energy (Ed) according to the refractive index (no).
In Addition Some special parameters in the Sellmeier model were calculated, like Average Oscillator Wavelength (λo)nm, and Average Oscillator Length (So).
According to Wemple-Didomennco model the values of the refractive index dispersion is closer to (1.85) in the pure sample but decreases in the radiated sample to (1.0826) for the low energies.
According to Sellmeier it draws near to (1.83) in the pure sample while it decreases to (1.14) for irradiated sample at the long waves.
تم تحضير غشاءين من البوليستيرين PS( Polysterene ) نقي ومشعع بأشعة غاما ( Gamma Rays ) بطريقة الصب ( casting ) .
شملت الدراسة تسجيل طيف النفوذية T ( transmittance ) في المجال ( 400 – 900 )nm، و تم حساب قيم الامتصاصية A ( Absorbance ) ، والانعكاسية R ( Reflactance ) ، ومعامل الامتصاص α (Absorption Coefficient)، ومعامل التخامد Ko ( Extiction Coefficient ) ، وقرينة الإنكسار no
( Refractive index ) لأغشية البوليستيرين قبل التشعيع وبعده .
تمت دراسة تأثير أشعة على تشتت ( dispersion ) قيم قرينة الانكسار no وفقا لنموذجي ويمبل – ديدمينكو وسيللماير (Wemple – Didomenico and Sellmeier models).
تبين أن أشعة تؤدي إلى زيادة النفوذية T وانخفاض قيم كل من R وA وكذلك إلى انخفاض قيم no بشكل
واضح .
تم حساب بعض القيم الخاصة بنموذج ويمبل – ديدمينكو مثل طاقة المهتز الأحادي Eo
( Single Oscillator energy ), وطاقة التشتت Ed ( dispersion energy ) بدلالة قرينة الانكسار no .
اضافة الى ذلك تم حساب بعض القيم الخاصة بنموذج سيللماير مثل (nm) oλ ( معدل طول موجة المهتز)
( average oscillator wavelength ) ومعدل شدة طول المهتز So
(average oscillator length strength ). وفقا لنموذج ويمبل – ديدمينكو فإن قيم تشتت قرينة الانكسار تتقارب من ( 1.85 ) بينما تتناقص في حالة العينة المشععة إذا تبلغ قيمتها (1.0826) عند الطاقات المنخفضة .
تقترب قيم تشتت noوفقا لنموذج سيللماير من القيمة ( 1.83 ) للعينة النقية في حين تتناقص في حالة العينة المشععة حيث تبلغ (1.14) عند الموجات الطويلة .
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2018 ttps://creativecommons.org/licenses/by-nc-sa/4.0/
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
The authors retain the copyright and grant the right to publish in the magazine for the first time with the transfer of the commercial right to Tishreen University Journal for Research and Scientific Studies - Engineering Sciences Series
Under a CC BY- NC-SA 04 license that allows others to share the work with of the work's authorship and initial publication in this journal. Authors can use a copy of their articles in their scientific activity, and on their scientific websites, provided that the place of publication is indicted in Tishreen University Journal for Research and Scientific Studies - Engineering Sciences Series . The Readers have the right to send, print and subscribe to the initial version of the article, and the title of Tishreen University Journal for Research and Scientific Studies - Engineering Sciences Series Publisher
journal uses a CC BY-NC-SA license which mean
You are free to:
- Share — copy and redistribute the material in any medium or format
- Adapt — remix, transform, and build upon the material
- The licensor cannot revoke these freedoms as long as you follow the license terms.
- Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- NonCommercial — You may not use the material for commercial purposes.
- ShareAlike — If you remix, transform, or build upon the material, you must distribute your contributions under the same license as the original.
- No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.