Measurement of Prompt Neutron Decay Constant in Esfahan Light Water Subcritical Reactor Utilizing Feynman-α Analysis
M
Arkani
پژوهشکده ی رآکتور، پژوهشگاه علوم و فنون هستهای، سازمان انرژی اتمی ایران، صندوق پستی: 1339-14155، تهران ـ ایران
author
S
Khakshournia
پژوهشکده رآکتور، پژوهشگاه علوم و فنون هستهای
author
H
Khalafi
پژوهشکده رآکتور، پژوهشگاه علوم و فنون هستهای
author
N
Vosoughi
دانشکده مهندسی انرژی، دانشگاه صنعتی شریف
author
text
article
2016
per
Diagnostic methods based on zero power reactor noise theory are very common and widely applicable in kinetic parameters and are also one of the standard diagnosis methods of nuclear reactor cores. Feynman-α method is one of these efficient methods of diagnosis. In this work, this method is employed to measure the prompt neutron decay constant of the Esfahan Light Water Subcritical Reactor (ELWSCR). The ELWSCR is a deep subcritical reactor. Therefore, the prompt neutron decay constant of the core is a large negative quantity. Using an especial data acquisition system, the prompt neutron decay constant of the core, based on the Feynman-α analysis, is estimated to be 3966±88 sec-1. The time window of 100 µs is employed in this investigation. By applying the Rossi-α method, this parameter has alrealy been reported to be 3990±177 sec-1 in references. The comparison shows that our results are in a rather good agreement with that estimated by the Rossi-α method within the range of statistical uncertainties.
Journal of Nuclear Science and Technology (JONSAT)
Nuclear Science and Technology Research Institute
1735-1871
37
v.
2
no.
2016
1
7
https://jonsat.nstri.ir/article_111_85b4419e0dc33ce5bd4d326fcc6119af.pdf
Evaluation of Human Absorbed Dose of 177Lu-DOTA-Trastuzumab Based
on its Biodistribution Studies in Rats
A
Bahrami-Samani
پژوهشگاه علوم و فنون هسته ای، سازمان انرژی اتمی، صندوق پستی: 1339-14155، تهران ـ ایران
author
H
Yousefnia
پژوهشگاه علوم وفنون هسته ای
دانشکده مهندسی انرژی و فیزیک، دانشگاه صنعتی امیرکبیر
author
F
Abbasi Davani
گروه کاربرد پرتوها، دانشکده مهندسی هسته ای، دانشگاه شهید بهشتی
author
H
Afarideh
دانشکده ی مهندسی انرژی و فیزیک، دانشگاه صنعتی امیرکبیر
author
A.R
Jalilian
پژوهشگاه علوم و فنون هسته ای
author
S
Shirvani Arani
پژوهشگاه علوم و فنون هستهای، سازمان انرژی اتمی ایران
author
M
Ghanadi Maragheh
پژوهشگاه علوم و فنون هستهای، سازمان انرژی اتمی ایران
author
text
article
2016
per
: In this study, Trastuzumab was labeled with 177Lu, and its dosimetric calculation was performed considering the assessment of the absorbed dose in the organs of human body. 177Lu chloride was prepared after 7 days irradiation of enriched Lu2O3 in the Tehran Research Reactor at the thermal neutron flux of 4×1013 cm-2 s-1, and the specific activity of 70-80 GBq/mg. 177Lu-DOTA-Trastuzumab was obtained with an overall radiochemical purity of >98% under the optimized conditions. Biodistribution studies of the radioimmunoconjugate in normal rats were carried up to 168 h. Relative organ mass extrapolation method was used for calculation of the human absorbed dose. Because of the highest accumulation activity in reticuloendothelial system, liver and spleen have received the maximum dose of 0.95 and 0.89 mSv/MBq, respectively.
Journal of Nuclear Science and Technology (JONSAT)
Nuclear Science and Technology Research Institute
1735-1871
37
v.
2
no.
2016
8
15
https://jonsat.nstri.ir/article_112_911c7825dbe3cbd8a794296bc9b65988.pdf
A Study into the Effects of Gamma-Irradiation on Bioactivie Compounds,
Color and Microbial Load of Saffron
M
Barzegar
گروه علوم و صنایع غذایی، دانشگاه تربیت مدرس،
author
M
Seyhoon
پژوهشکدهی کاربرد پرتوها، پژوهشگاه علوم و فنون هستهای
author
M. A
Sahari
گروه علوم و صنایع غذایی، دانشگاه تربیت مدرس
author
text
article
2016
per
In this study, the effects of γ-radiation on physicochemical properties of Iranian saffron (Crocus sativus L.) such as crocin (saffron color factor), kaempferol (polyphenol bioactive compounds) and safranal (the main component of volatile aromatic saffron), color paramerters a*, b*, L* and ΔEh indices and the microbial load were investigated. The saffron samples were irradiated at dosages of 0, 1, 2, 3, 4, 5 and 6 kGy by a Gammacell 220. Then, the efficient compounds were extracted and the composition and microbial load of saffron extracts were determined before and after the γ- irradiation. The results showed that in addition to decreasing the microbial content of saffron, among the 21 bioactivie compounds separated by HPLC, crocin, kaempferol and safranal content in three regions of this study were affected by the gamma irradiation. Pre- treatment of saffron with 4 and 6 kGy radiation also results in a significant (p<0.01) increase, without changes in color and bioactivie compounds. These data may suggest that irradiation of saffron without unfavorable changes on the effective componeents results in a significant decrease in the microbial content of this product.
Journal of Nuclear Science and Technology (JONSAT)
Nuclear Science and Technology Research Institute
1735-1871
37
v.
2
no.
2016
16
25
https://jonsat.nstri.ir/article_113_b1ebd184fae486dc2639fa7ef80f5c25.pdf
Investigation of Soil Corrosivity Effect on Low Radioactive Wastes Burial Casks
H
Forati Rad
پژوهشگاه علوم و فنون هستهای، سازمان انرژی اتمی ایران،
author
H. R
Mohajerani
شرکت پسمانداری صنعت هستهای ایران، سازمان انرژی اتمی
author
M
Nejat Pishkenari
شرکت پسمانداری صنعت هستهای، سازمان انرژی اتمی ایران
author
A
Maleki Faresani
شرکت پسمانداری صنعت هستهای ایران، سازمان انرژی اتمی ایران
author
S
Momenzade
شرکت پسمانداری صنعت هستهای، پژوهشگاه علوم و فنون هستهای
author
M
Rostam Nejad
شرکت پسمانداری صنعت هستهای، سازمان انرژی اتمی ایران
author
M
Asadian
شرکت پسمانداری صنعت هستهای، سازمان انرژی اتمی ایران
author
text
article
2016
per
In this study, corrosion of AISI st37 steel waste casks was investigated by analyzing the physico-chemical characteristics of the soil medium. The chemical composition of soil has important effects on steel casks. Moisture, soil electrical resistivity, soluble salts, chlorides, pH, redox potential and anions and cations content, as the major parameters, influence the exterior corrosion of waste casks. To carry out this research, the corrosivity of the soil in the central desert regions of Iran has been studied using the AWWA C105 standard. In these regions, 4 samples have been collected at varied points located in the vicinity of the site, named CR1, CR2, CR3 and CR4. At first, for a better assessment of the soils corrosivity, the physical and chemical analyses were conducted on the soil and in the solutions prepared from the soil samples. Then, the rate of corrosion was measured by the weight loss and potentiodynamic polarization methods. The obtained results showed that the CR4 soil sample with the lowest electrical conductivity, compared with the other samples, has the lower corrosion rate in the whole method. Corrosion rates of the samples in this region in the 180-day weight loss method, and in the electrochemical method are equal to 0.0625 and 0.029 mm/y, respectively.
Journal of Nuclear Science and Technology (JONSAT)
Nuclear Science and Technology Research Institute
1735-1871
37
v.
2
no.
2016
26
36
https://jonsat.nstri.ir/article_114_4756e9c5d4add9a5406eac284b009334.pdf
Electrochemical Formation of Hydride Phases on the Zirconium- 1% Niobium Alloy Used in Nuclear Fuel Cladding
I
Moradi Gharatloo
پژوهشکده مواد، پژوهشگاه علوم و فنون هسته ای، سازمان انرژی اتمی ایران،
author
A
Nozad Golikand
پژوهشکده مواد، پزوهشگاه علوم و فنون هستهای، سازمان انرژی اتمی ایران
author
M. B
Bagher Fathi
گروه فیزیک حالت جامد، دانشکده فیزیک، دانشگاه خوارزمی
author
I
Hasanzadeh
پژوهشکده مواد، پژوهشگاه علوم و فنون هستهای، سازمان انرژی اتمی ایران
author
text
article
2016
per
Investigation into the destructive effects of the hydride formation on the zirconium fuel claddings, involves working with radioactive materials. In order to avoid this problem, in this study, zirconium hydride phases were created on the Zr-1%Nb alloy (used in nuclear fuel cladding), by the electrochemical charging method. The experiments were carried out in 0.017 M NaCl aqueous solution at room temperature. The samples were analyzed by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that the protective oxide layer had been destroyed, and Zr-H-Zr and Zr-H bonds were formed on the surface. In addition, by diffusion and increasing the hydrogen concentration in the bulk, ZrH2 and ZrH hydride phases had been formed in addition to the cracks in the sample, because these phases had about 10% difference in volume with the zirconium phase.
Journal of Nuclear Science and Technology (JONSAT)
Nuclear Science and Technology Research Institute
1735-1871
37
v.
2
no.
2016
37
45
https://jonsat.nstri.ir/article_115_e2a2643b1de26adf1d6e0774b0efffb0.pdf
Characterization of Anodic Porous Alumina by Ion Beam Analysis Method
F
Mokhles Gerami
گروه فیزیک، دانشگاه پیام نور،
author
A. R
Kakuee
پژوهشکدهی فیزیک و شتابگرها، پژوهشگاه علوم و فنون هستهای
author
S
Mohammadi
گروه فیزیک، دانشگاه پیام نور
author
text
article
2016
per
Porous aluminum oxide due to its unique properties has a wide range of applications in technology. The quality of porous layer, its thickness as well as the size and density of pores, have crucial rule in the performance of this advanced material. Direct and nondestructive measurement of specifications of the porous layer is among the challenges facing the researchers in controlling its fabrication process and improvement of its performance. In this research work, we have tried to employ the capabilities of ion beam analysis techniques to determine certain characteristics of the porous aluminum oxide layer. For this purpose, the techniques of elastic backscattering spectroscopy (EBS), elastic recoil detection (ERD) analysis, and nuclear reaction analysis (NRA) have been employed for characterization of porous alumina and its comparison with nonporous alumina. Using the EBS technique, elemental composition, impurities and depth profiles of elements in the sample are measured. By the NRA technique, oxygen and carbon concentrations in the sample are determined; and by using the ERD technique, the depth profile of the existing hydrogen in the sample is measured. Moreover, by employing the resonant ion beam scattering analysis of 16O(α ,α)16O, structural analysis of the porosity is investigated.
Journal of Nuclear Science and Technology (JONSAT)
Nuclear Science and Technology Research Institute
1735-1871
37
v.
2
no.
2016
46
56
https://jonsat.nstri.ir/article_116_31c0b2dc6aff544497770d3651b4015d.pdf
Investigation of Soft X-Ray Laser with Plasma Active Medium and Self-Filtering Unstable Resonator
A.H
Farahbod
پژوهشکده ی پلاسما و گداخت هسته ای، پژوهشگاه علوم و فنون هستهای، سازمان انرژی اتمی ایران،
author
G
Ghani-Moghadam
پژوهشکده پلاسما و گداخت هستهای، پژوهشگاه علوم و فنون هستهای
author
text
article
2016
per
This paper proposes that self-filtering unstable resonator (SFUR) is suitable to be used in soft x-ray lasers possessing an active medium with a short-gain-lifetime. For this purpose, a self-filtering unstable resonator (SFUR), in one and two dimensions with Ne-like Fe soft x-ray active medium at 25.5 nm and maximum gain 124 cm-1, has been theoretically investigated to obtain a low beam divergence of ~ 0.5 mrad. The role of the field-limiting aperture in mode propagation has also been shown. In addition, the beam quality factor M2 has been calculated and the output mode behavior has been investigated and compared with a plane-parallel (PP) resonator of equal length. The calculations indicate that the M2 factor in SFUR resonator is smaller than the PP resonator and therefore the output beam divergence is lower and the mode quality is much better resulting in a higher beam spatial coherency.
Journal of Nuclear Science and Technology (JONSAT)
Nuclear Science and Technology Research Institute
1735-1871
37
v.
2
no.
2016
57
67
https://jonsat.nstri.ir/article_117_1aa9a4add431760f03e8699fa05a7091.pdf
Impact of Ambient Gases on the Plasma Radiation and its Expansion in Laser-Copper Interaction
M
Pishdast
گروه الکترونیک، مجتمع دانشگاهی برق و الکترونیک، دانشگاه صنعتی مالک اشتر،
author
A
Eslami Majd
گروه الکترونیک، مجتمع دانشگاهی برق و الکترونیک، دانشگاه صنعتی مالک اشتر
author
M
Kavosh Tehrani
پژوهشگاه علوم و فن آوری اپتیک و لیزر، دانشگاه صنعتی مالک اشتر، شاهین شهر
author
text
article
2016
per
In this paper, the impacts of air, argon, helium and neon ambient gases under different gas pressures on radiations, emphasizing in the signal to radiation background and the expansion of laser induced plasma from laser metal interaction have been experimentally studied using spectroscopy, probe beam absorption, and scattering methods. The results show that the plasma radiations and its expansion behavior depend strongly on the ambient gas presure. The highest intensity of the copper spectral lines occurred in argon, neon, air, and helium, respectively. For all gases, by increasing the gas pressure from 5 to 100 mbar the plasma spectral radiation increases and then it saturates at the higher gas pressure. The continuum radiation also increases with the pressure and has the highest value for Ar, air, Ne and He gases, respectively. Plasma in He, Ne, air and Ar has the best singnal to backgrourd (S/B) ratio, respectively, and decreases with the pressure. The probe beam absorption and scattering results have also been compared with the Sedov-Taylor strong shock wave model. The maximum speed of the plasma plume expansion, occurred near the target surface under 750 mbar gas pressure, and was determined for helium to be about 25200 m/s, and through neon, air and argon gases, amounted to about 15625, 13900 and 11860 m/s, respectively, as they reduced significantly when they were far from the target surface and reached 2550, 1000, 700 and 690 m/s at 6 mm from the target for helium, neon, air and argon, respectively.
Journal of Nuclear Science and Technology (JONSAT)
Nuclear Science and Technology Research Institute
1735-1871
37
v.
2
no.
2016
68
78
https://jonsat.nstri.ir/article_118_1872347005b146ca754ca114a25d75ba.pdf
Effects of Different Doses of Gamma Rays on Seed Germination Characteristics
of Balango Shirazi (Lallemantia Royleana)
M. H
Fotokian
مرکز تحقیقات گیاهان دارویی، دانشگاه شاهد،
author
Z
Madani
دانشکدهی علوم کشاورزی، دانشگاه شاهد
author
text
article
2016
per
Balango (Lallemantia royleana), as a medicinal plant, contains a significant amount of effective ingredients. Balango seed has several properties: it is anti-bloating, constipation, dry cough, and asthma to name only a few. With regard to the importance of genetic diversity in plant breeding, induced mutation has been used for diversification. This study was conducted to evaluate the effect of gamma rays doses (0, 50, 100, 150, 250, 350, 450, 550, 700, and 900 Gy) on traits related to grains of Balango Shirazi, and also to determine the suitable dose of gamma rays for induced mutation through completely randomized design with four replications. On the basis of variance analysis results, the differences among gamma rays doses were statistically significant for traits such as shoot dry weight, root fresh weight, mean germination time, germination rate, germination variances, germination homogeneity, root length and shoot length. The correlation of germination percentage with traits included germination rate, germination variance, root fresh weight, shoot dry weight. The shoot dry weight was positively significant at 1% probability level. Meanwhile, the correlation of germination percentage with shoot length and root length was not significant. As a conclution, gamma dose of 250 Gy was chosen as a suitable dose in mutation breeding experiment of Balango.
Journal of Nuclear Science and Technology (JONSAT)
Nuclear Science and Technology Research Institute
1735-1871
37
v.
2
no.
2016
79
87
https://jonsat.nstri.ir/article_119_19fa9d5ae8c86b4da14807823b5f147b.pdf
Measurement of Axial Dispersion Coefficient of the Continuous Phase in a Pulsed Disc and Doughnut Column Using Dispersion Model with Radiotracer Technique
M
Tabasi
پژوهشگاه علوم و فنون هستهای، سازمان انرژی اتمی ایران
author
Y
Yaghoubi
دانشکده مهندسی انرژی، دانشگاه صنعتی شریف
author
M
Outokesh
دانشکده مهندسی انرژی، دانشگاه صنعتی شریف
author
M
Torab- Mostaedi
پژوهشکدهی چرخهی سوخت هستهای، پژوهشگاه علوم و فنون هستهای
author
text
article
2016
per
High efficiency and low required area for the pulsed columns are interesting and useful especially in nuclear industries in spite of exposure and radiation protection requirements. In this research, dispersion coefficient in a typical disc and doughnut pulsed column in a two phase system (water and kerosene) was determined via radiotracer technique. In the radiotracer method, two Geiger-Mueller detectors at the top and bottom of the active section of the pulsed column and 99mTc in the form of NaTcO4 as radiotracer are used. Dispersion is introduced by Pecletdimensionless number which is inversely propotional to the dispersion coefficient. The continuous and dispersed phase flow rate, amplitude and frequency of pulse as the effective parameters on axial mixing and dispersion coefficient magnitude have been studied. Experimental results indicate that by increasing the continuous phase flow rate, the dispersion coefficient decreases. Also, by increasing the dispersion phase flow rate as well as the amplitude and frequency of the pulse, the dispersion coefficient will increase.
Journal of Nuclear Science and Technology (JONSAT)
Nuclear Science and Technology Research Institute
1735-1871
37
v.
2
no.
2016
88
95
https://jonsat.nstri.ir/article_120_e55d065571257a8e9e48061c4b12afee.pdf