نتایج جستجو برای: 232th

تعداد نتایج: 483  

Journal: :caspian journal of enviromental sciences 0

this study was conducted to determine the radioactivity concentration in soil samples of anarak-khour district located at central iran. 48 soil samples from a depth of 10-15 cm were taken from seven different sites for monitoring. the radioactivity concentration of 238u, 232th, 137cs and 40k in soil samples was determined, using a high resolution (hpge detector, p-type) γ-spectrometry by detect...

Journal: :iranian journal of medical physics 0
zahra poursharif department of food science & technology, ferdowsi university of mashhad, mashhad, iran ali ebrahiminia department of biochemistry & biophysics, faculty of medicine, guilan university of medical sciences, rasht, iran mohsen asadinezhad department of biochemistry & biophysics, faculty of medicine, guilan university of medical sciences, rasht, iran abolfazl nickfarjam department of medical physics, shahid sadoughi university of medical sciences, yazd, iran abolghasem haeri radiological protection department, nuclear science & technology research institute, atomic energy organization of iran, tehran, iran karim khoshgard department of medical physics& medical engineering, kermanshah university of medical sciences, kermanshah, iran

introduction foodstuffs are known to contain natural and artificial radionuclides. determination of radionuclide concentration is of great significance for the protection of human health. the main objective of the present study was the quantification of radionuclides in tea samples, cultivated in guilan province in north of iran. materials and methods the activity concentrations of 226ra, 232th...

Journal: :iranian journal of radiation research 0
q.m. rashed-nizam department of physics, university of chittagong, chittagong-4331, bangladesh m. rahman department of physics, university of chittagong, chittagong-4331, bangladesh m.k. tafader institute of marine science, university of chittagong, chittagong -4331, bangladesh m. zafar institute of marine science, university of chittagong, chittagong -4331, bangladesh a.k.m.s.i. bhuian radioactivity testing and monitoring laboratory, bangladesh atomic energy commission, chittagong medical college campus, chittagong, bangladesh r.a. khan radioactivity testing and monitoring laboratory, bangladesh atomic energy commission, chittagong medical college campus, chittagong, bangladesh

to assess the environmental radioactivity levels and hence to determine the population exposure in kutubdia island, bangladesh the sediment samples were analyzed by using gamma ray spectrometry. in those sediment samples the average activity concentration of natural radionuclides 238u, 232th and 40k were found 15.39±1.67, 38.35±0.76 and 475.51±21.15 bq/kg respectively. the activity concentratio...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تبریز 1389

در سالهای اخیر به منظور تعیین میزان آسیب های ناشی از تشعشعات رادیوایزوتوپ های طبیعی موجود در محیط زندگی بشر اندازه گیری غلظت عناصر رادیواکتیو نمونه های طبیعی بسیار ضروری به نظر می رسد. نیمه عمر واپاشی رادیوایزوتوپ-های 238u ، 232th و 40k طولانی و قابل مقایسه با عمرزمین (تقریبا 109 سال) می باشد. ازاین رو فراوانی این رادیوایزوتوپ ها از زمان پیدایش زمین تا کنون تغییر زیادی ننموده است. نمونه های طبی...

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