Analytical and experimental study of the effect of noise background on the radioactivity measurement

In this experimental work, the instruments used (detector, calibrating sources) has been calibrating, the calibration line of the detector deduced and it has been finding that the equation of calibration line takes the form: The resolution power R has been studying as function of the distance between the activity source and detector; the results obtained show that R decrease by increase the energy of the lines spectrum, this mean that the detector resolution power become bigger. It has been measured the LC، LD and MDA using two different methods of background radiation value, trapezium method and classical method, for two different distances between radioactivity source and detector: (9,3cm) and (10cm). The results show: 1- There is similar comportment of the LC، LD and MDA in function energy and the distance between radioactivity source and detector. 2- The trapezium method gives better results from the classical method to the radiation background, and this leads to lesser MDA value, this means that the sensibility is bigger to measure this quantity. 3- The relative error using MDA is (5%) for large values, and (10%) for small values

Statistical and Analytical Study of Radiation Dose Resulting from Using Some Medical Radiographic Devices

The measurements carried out in many medical centers in the middle region) Homs and Hama ( to estimate medical radiation dose which patient received it resulting from some radiation radiographic devices.

Analytical and experimental study of the mechanisms of computing and measuring the radioactivity of the radioactive sources

In this work, we have used the basic techniques for measuring gamma rays. It is based on the use of a sodium iodide (NaI) detector withthallium activated (Tl). We have obtained:  The detector calibration NaI(Tl) and the resolution of the spectrometer.  Measuring and determining the activity of a source can be doneby using the relative, and the absolute method. The results obtained show bythe Comparison between the experimental and the theoretical(of the sources activities)a good agreement, and the best values obtained by the absolute method.

Determination of the neutrino mass through the study of the energy spectrum of radiation of Strontium-90 isotope

In this work, using a scintillation detector with Strontium-90 source as a try to measure the electronic neutrino mass from a simple technique and different from what is used in this area where current techniques used are very complex and require substantial amounts. Also, detector calibration (to find the straight calibration equation), in addition to identified the maximum energy of β- particles (electrons), experimentally, by selection the channel number and then finding the energy value from the calibration equation (as a straight line). We have studied the disintegration changed energy with absorbent material which is an aluminum slices that have different thickness. We have observed the decrease in the values of the maximum energy of the electrons with increases the thickness of the slices. The energy changes with thickness as: E = f (x), (a straight line have a negative inclination). Applying Fermi 's theory and Kurie's plot allowed to find the maximum energy of disintegration electrons (1697,58 keV), this value is so close to experimental value (1653,45 keV), with dubity (2,6%) We have found that the electronic mass neutrino mass is almost to be non-existent, or we can said that the Strontium-90 disintegration does not allow to measure mass neutrino mass accurately, this is due to the high value of the disintegration energy of the Strontium- 90 isotope.

Evaluation and Characterization of The Quantitative and Qualitative Traits in The Second Mutant Generation of Barley Variety Furat9

The response of barley variety Furat9 (tow-rowed), has been noted for three doses of Gamma radiation (10, 15, and 20 Kr). The objective of the research, to evaluate and characterize the quantitative and qualitative traits, to identify and calculate the proportion of the total and relative changes, to determine the best doses of Gamma rays, and to study the relationship among the traits in the second generation.

The ٢nd & ٣rd Lower Molars Development of in utero Gamma Irradiated Mouse Fetus and Neonates

Pregnant mothers were irradiated by a single dose of gamma rays (٠،٢،٤،٦ Gy, Cobalt ٦٠) in the days ١٠،١٢،١٤،١٦،١٨ of pregnancy. The heads of the embryos’, and those of the neonates were taken at consecutive intervals of irradiation, starting from ١٦ days of pregnancy till ٣rd day after delivery. The effect of irradiation was investigated in the development of the ٢nd and ٣rd lower molars on serial tissue sections, within consecutive periods of their organogenesis. Irradiation led to growth-deficiency in the ٢nd & ٣rd molars, and caused delay in their development. This was observed in various degrees depending on the dose, time of irradiation, and time after irradiation.

Effect of γ Irradiation on the Odontogenesis of Mouse Embryos

Mice embryos were irradiated in utero by gamma rays (٠،٢،٤،٦ Gy) at ١٠،١٢،١٤،١٦،١٨ days of gestation. Histological study was carried out on the first premandibular molar after ٢،٤،٦،٨ days of irradiation, to investigate the effect of irradiation on different stages of molar development.

The influence of irradiation on band gap Eg values for PVC membranes prepared by Casting method

In this paper samples of poly vinyl chloride PVC ,pure, irradiated with Gama rays, were prepared by casting method in room temperature and light, and under atmosphere pressure. It was observed from this research that irradiation made real effect on some of the studied optical properties, the irradiation increased the transmittance while the electronic transitions kind remained indirect before and after the irradiation.

The Effect of Different Doses of Gamma Rays on Growth and Productivity of Local Garlic Allium sativum L. Var. Yabroudi in Syria

This research was conducted at AlTieba Research Station, General Commission for Scientific Agricultural Research (GCSAR) in 2012 and 2013 seasons, to study the effect of different doses of gamma rays on growth and productivity of local garlic Allium sativum L. cultivar “Yabroudi” in Syria. Cloves were exposed to four different doses of gamma rays of 60Co source 1, 2.5 ,5 ,10 ) Gray). Randomized Complete Block Design (RCBD) was used .The results showed the surviving plants after 60 days of planting declined with the increase of dose levels. The percentage of dead plants at the doses (2.5, 5 Gray) was 50 and 54 %, respectively. Also, it was possible to obtain a larger number of viable mutations. Therefore, they could be considered as close as to LD50. The dose (10 Gray) had a negative effect on the length of the cloves’ germination period, leading to the death of all the plants after 60 days of planting, this could be considered lethal dose (LD100). The response of the local garlic cultivar Yabroudi to the low-dose (1 Gray) of gamma ray was higher comparing with other doses. This is due to the positive effect of this dose (Stimulus) on the vegetative growth that was reflected on the productivity indicators. The productivity reached (4.50 kg/m2), which was significantly superior to the control (2.91 kg/ m2) and the two doses (2.5, 5 Gray), respectively (2.26, 1.60 kg/ m2).