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Hosseinzadeh A.,Urmia University | Shayesteh N.,Islamic Azad University at Mahābād | Zolfagharieh H.,Medical and Industrial Research School | Babaei M.,Medical and Industrial Research School | And 3 more authors.
Journal of Plant Protection Research | Year: 2010

The effect of gamma irradiation on different developmental stages of Oryzaephilus surinamensis L., was investigated. Results showed that a required dose to prevent larval emergence from irradiated 1-2-days-old eggs was 60 Gray (Gy), and 350 Gy was required to prevent adult emergence from 15-days-old larvae. Also the required dose of radiation to prevent adult emergence from irradiated 5-days-old pupa was 700 Gy. The dose of 200 Gy caused 100% mortality of irradiated adults 28 days after treatment. In addition, the effect of gamma rays was studied on the developmental stage period of each irradiated stage till adult emergence. The results revealed that there was a dose-dependent increase of the developmental periods. The growth index of adults was significantly decreased with increasing dose of radiation administered to eggs, larvae and pupae. It is recommended that doses between 600 and 700 Gy should be used to control population growth of O. surinamensis when targeting pupae and adults present in stored products.


Abbas H.,Urmia University | Nouraddin S.,Islamic Azad University at Mahābād | Reza Z.H.,Medical and Industrial Research School | Iraj B.,Urmia University | And 4 more authors.
African Journal of Biotechnology | Year: 2011

Indian meal moth Plodia interpunctella Hübner is one of the most important stored products pests in the world. In this research, the effect of gamma irradiation was studied on different developmental stages of this pest and the doses required to prevent each of these developmental stages was investigated. From the results, required dose to prevent larval emergence from irradiated 1 to 24 h eggs was 400 Gray (Gy), and 400 Gy was required to prevent pupae from 15 days old larvae. Also, the dose of radiation required to prevent adult emergence from irradiated 5 days old pupa was 650 Gy. According to the results, dose of 650 Gy is adequate to control all immature stages of this pest. In addition, the effect of gamma ray was studied on developmental stage period of each irradiated existence stage till adult eclosion. The results revealed that there was a dose-dependent increase in the developmental periods, and the growth index of the adults was significantly decreased with increasing dose of radiation administered to the eggs, larvae and pupae too. It is concluded that irradiation can be used as a safe method to control stored pests. © 2011 Academic Journals.


Hooshangi Z.,Shahid Beheshti University | Feghhi S.A.H.,Shahid Beheshti University | Sheikh N.,Radiation Application Research School
Radiation Physics and Chemistry | Year: 2015

Engineering plastics like Poly (butylene terephthalate) due to their desirable properties have various industrial applications. Neat PBT is highly combustible, so it is necessary to improve significantly its fire retardancy to meet the fire safety requirements. The combustion performance of PBT can be improved by addition of appropriate flame retardant additives. In this study we have investigated the effect of halogen free flame retardants, i.e. melamine and aluminum phosphate, and instantaneously electron beam radiation-induced crosslinking in the presence of Triallyl cyanurate on various properties of PBT.The results of gel content showed that a dose range of 200-400. kGy leads to high cross linked structure in this polymer. Also mechanical experiments showed that its structure became rigid and fragile due to irradiation. Radiation crosslinking of this polymer made its dielectric loss coefficient ten times lower than non-irradiated polymer, but had no effect on its dielectric constant. Moreover the addition of the fire retardant additives as impurity decreased the dielectric loss coefficient. TGA analysis in nitrogen exhibited that irradiation increases char formation and use of the fire retardant additives leads to reduction of onset temperature and formation of higher char quantity than pure PBT. According to the results of UL-94, irradiated samples burned with lower speed and less dripping in vertical and horizontal positions than pure polymer. Finally irradiation of the polymers containing fire retardant additives with a dose of 400. kGy led to self-extinguishing and non-dripping and reach to V-0 level in the UL-94 V. © 2014 Elsevier Ltd.


Faripour H.,Laser and Optic Research School | Peyvandi R.G.,Radiation Application Research School | Islami rad S.Z.,Radiation Application Research School
Crystallography Reports | Year: 2014

Improvement of crystal performance is important for the nuclear instrumentation, medical imaging and radiation measurement as industrial application. For achieving this aim, we developed to establish crystal growth process and design and fabricate crystal growth equipment. Finally, the single crystal scintillator of NaI (Tl) was grown successfully by the conventional Czochraski method and Thallium quantity was measured through grown crystal. The results showed Thallium losses by evaporation during crystal growth. Thus, the first part of grown NaI(Tl) (2.5 cm) has high light yield and is suitable for counter. The characteristics of the grown NaI(Tl) were evaluated on the excitation, emission responses. Finally, grown crystal was used as scintillators in nuclear radiation detection, industrial applications and etc. © 2014, Pleiades Publishing, Inc.

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