صادقی, احسان

دانشگاه کاشان

[ 1 ] - سنتز نانوذرات منیزیم سولفات آلاییده شده با مس به روش هیدروترمال و بررسی خاصیت ترمولومینسانس آن‌ها در پرتودهی گاما

In this research MgSO4:Cu nanoparticles was synthesized for the first time by hydrothermal method. The size of the produced nanoparticles calculated by scherrer equation was about 36 nm using XRD pattern which was in agreement with that of SEM analysis. Thermoluminescence (TL) properties of the MgSO4:Cu nanoparticles was investigated in gamma irradiation by 60Co source. Optimum amount of impuri...

[ 2 ] - ساخت بلور سدیم کلرید خالص به روش همرسوبی در اندازه‌های متفاوت و بررسی خواص ترمولومینسانس آن در پرتودهی با گاما

In this research, Pure Sodium chloride (NaCl) Nano and micro particles were produced for the first time by using the surfactant in co-precipitation method. X-ray diffraction (XRD) and scanning electron microscope (SEM) were utilized to analyze the shape and size of the synthesized material. The role of CTAB surfactant on morphology of particles was also investigated. The results show that CTAB ...

[ 3 ] - تفکیک دز نوترون و گاما در میدان‌های آمیختۀ( n-γ (Am-Be, 137Cs) با استفاده از دزیمتر TLD-500

The possibility of employing α-Al2O3:C (TLD-500) for estimation of gamma dose in mixed n-γ radiation fields by two peak method has investigated. It was found that the main peak can be reliably deconvoluted to two component glow peaks. The ratio of peak 2 to peak 1 in pure gamma ray radiation field (137Cs) is 1.49 whereas irradiation by Am-Be neutrons results in a ratio of 1.12. The precision of...

[ 4 ] - تعیین میزان دز جذب‌شدۀ پرتو گاما به روش PTTL با استفاده از آشکارساز α-Al2O3:C

Phototransferred thermoluminescence (PTTL) was used to reeestimate the absorbed gamma dose in α-Al2O3:C dosimeter. The PTTL response of this phosphor for different UVB irradiation times was investigated. The results show a linear PTTL response for gamma absorbed doses from 0.1 to 14 mGy. Because of high PTTL sensitivity in this phosphor, the low limit of re-estimated gamma dose using PTTL metho...

[ 5 ] - ساخت نانوبلور لیتیوم تترا بورات آلاییده با منیزیم به روش احتراقی و‌ بررسی رفتار لومینسانس آن

Lithium tetraborate nanoparticles were synthesized by combustion method. The shape and size of nanoparticles were determined by scanning electron microscopy (SEM). X-ray diffraction pattern (XRD) confirmed the formation of lithium tetraborate nanocrystals. Thermoluminescence (TL) glow curve of the produced nanoparticles following irradiating with gamma radiation demonstrates five overlapping gl...

[ 6 ] - ساخت دزیمتر گرماتاب LiF:Mg,Cu,P و بررسی تأثیر ناخالصی مس بر خصوصیات گرماتابی آن

LiF powder having particle size of 50-200 µm doped with Mg, Cu and P impurities was produced using melting method. The whole construction process was conducted in a nitrogen atmosphere. The effect of Cu impurity on the thermoluminescence glow curve was investigated and the appropriate amount of Cu was determined. The TL properties of the fabricated phosphor was compared to commercial LiF:Mg,Cu,...

[ 7 ] - ساخت نانوذرات ZnS:Mn و بررسی توانایی تولید گونه‌های فعال اکسیژن توسط آن‌ها

امروزه نانوذرات نیمه‌هادی، توجه بسیاری را در شاخه‌های نانو پزشکی به خود جلب کرده‌اند. در این تحقیق توانایی نانوذرات ZnS:Mn در تولید گونه‌های فعال اکسیژن شامل رادیکال هیدروکسیل بررسی شد و همچنین روش سنتز نانوذرات ZnS:Mn گزارش شد. نانوذرات ZnS:Mn به روش هم‌رسوبی ساخته شد. تحریک نانوذرات توسط پرتو UV انجام گرفت. مشخصه‌یابی ساختار نانوذرات تهیه شده با استفاده از آنالیزهای XRD, TEM، SEM و PL انجام گ...

[ 8 ] - ساخت دزیمتر لیتیم فلوراید آلاییده با استرانسیم و سریم به روش ذوب و مطالعه خواص ترمولومینسانس آن

In this work, lithium fluoride doped with impurities of Sr and Ce, was produced using melting method and its thermoluminescence (TL) properties was investigated. The optimized values of 0.5 mol% of Sr and 0.1 mol% of Ce were obtained for the most TL sensitivity. Reusability of the prepared samples has been investigated for 5 cycles of annealing, irradiation and reading and no considerable chang...

[ 9 ] - بررسی پارامترهای سینتیک دام‌های عمیق دزیمتر C:3O2α-Al (500-TLD) از راه مقایسه‌ی پاسخ گرمالیانی انتقال یافته‌ی نوری تجربی با مدل نظری

پاسخ گرمالیانی انتقال یافتهی نوری (PTTL) دزیمترC:3O2α-Al (500-TLD) با مدل نظری توصیفکنندهی این پ...

[ 10 ] - تعیین دز گاما در میدان آمیخته‌ی نوترون- گاما با استفاده از دزیمترهای ترمولومینسانس LiF:Mg, Ti(TLD-600)

در این مقاله با استفاده از نسبت شدت قلهی چهارم به قلهی پنجم منحنی درخشندگی دزیمتر ترمولومینسانس TLD-600، دز گاما در میدان آمیختهی نوترون- گاما مشخص شده است. ابتدا نمونهها توسط چشمههای Am-Be و Cs137 تحت تابش به ترتیب نوترون و گاما قرار گرفتند. میزان پرتودهی توسط چشمهها به گونهای تغییر داده شد که میزان دز گاما از 20 تا %52 دز کل متغیر باشد. با استفاده از برنامهی کامپیوتری مبتنی...

[ 11 ] - Investigation of the production of free radicals in ultraviolet irradiation using SnO2:Eu nanoparticles

In studying the ultraviolet (UV) radiation, one of the important factors is the possibility of generating a variety of free radicals inside the body by these radiations. In this paper, a method of estimating the amount of hydroxyl radicals produced by ultraviolet rays was investigated using nanoparticles of tin oxide doped with uropium. In this method, the change in absorption intensity of meth...

[ 12 ] - Synthesis of strontium borate doped with Pb by solid state method and characterization of its thermoluminescent glow curve

Strontium Tetraborate doped with Lead SrB4O7:Pb powder was prepared by solid state method. The formation of Strontium Tetraborate compound was analyzed by X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM). Thermoluminescence Glow Curve of gamma irradiated sample was investigated in order to use as a thermoluminescent dosimeter. Because of excellent mechanical properties, non-hygros...

[ 13 ] - Thermoluminescence characteristics and kinetic analysis of copper doped magnesium sulfate in gamma irradiation

MgSO4:Cu phosphor was synthesized by solid state method. Optimum concentration of copper was determined at 0.1 mol%. Thermoluminescence characteristics of MgSO4:Cu was studied following gamma irradiation. A linear dose response was observed in dose range of 1Gy to 500Gy. Reusability of this sample was tested after 10 cycles of gamma irradiation and it revealed that the intensity remains approxi...