Generally, doses greater than 2Gy can produce acute biological effects in humans. For this reason, to measure and record the cumulative dose, especially in radiation users, the need for a personal dosimeter has been strongly felt by the researchers. The purpose of this study is to introduce retrospective dosimetric techniques, in particular the use of nails as a natural tool for determining cum...

Calcium fluoride nanoparticles doped with thulium and cerium were synthesized as a novel nanostructure by using the hydrothermal method. The prepared samples were characterized by X-ray diffraction (XRD) and energy dispersive spectrometer (EDS). The crystallite size of about 36 nm was estimated employing Scherer’s formula. Its shape and size were also observed by scanning electron microscope (...

food safety is considered as an important world concern. the detection of pathogen and toxic materials in food has an important role in public health care. in recent years, the applications of microbial biosensor have been developed as a new approach for toxicity control. luminescent microbial biosensor is an appropriate biological tool for protection of natural environment. this type of biosen...

پایان نامه حاضر در مورد امکان سنجی استفاده از مدلسازی آماری مبـتنی برbmd جهت برآورد حجم بحرانی خونریزی درایجاد مقادیر معینی از خطر مرگ ناشی از خونــریزی مــغزی غیرتروماتیک(خود به خودی) می باشد. روشbmd در رابطه با مقدار دوز یا حجم بحرانی یک وضعیت از پیش تعیین شده برای بدست آوردن بهترین پاسخ جهت ارزیابی خطرات سلامتی و بهداشتی و همچنین برآورد مقدار یا حجم بحرانی دوز می باشد. روشbmd یک روش جایگزین...

In this study, the pure nano-structure hydroxyl apatite samples were synthesized via hydrolysis method. The powder samples were sintered at various temperatures of 500°C, 700°C and 900°C in a furnace. X-ray diffraction (XRD) and Fourier transform infra-red (FTIR) spectroscopy systems were used to characterize the synthsized samples. Comparison of the glow curves shows that the most ...