The irradiation dose

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  • Decolorization from synthetic wastewater containing Reactive Red 24 (RR24) using gamma Cobalt-60 ray was investigated. The influence of the irradiation dose, initial pH, initial dye and hydrogen peroxide (H2O2) concentration were evaluated. The pH effect has proved that lower decolorization efficiency was observed in alkaline medium as compared to the neutral and acid medium. While color removal efficiency increased with increasing absorbed dose.

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  • Fourteen genotypes and 3 different gamma ray doses were tested to develop an efficient haploidization protocol in squash. For this purpose, male flowers collected 1 day before anthesis were irradiated with 150, 200, and 300 Gy gamma ray doses, and female flowers were pollinated with the irradiated pollens the next day.

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  • Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Radiation Oncology cung cấp cho các bạn kiến thức về ngành y đề tài: Safety margin in irradiation of colorectal liver metastases: assessment of the control dose of micrometastases...

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  • Protocols for haploid induction in cucurbits are based on pollination with irradiated pollen, but the induction frequency is low and the majority of obtained embryos are zygotic. The longevity of Cucurbita pepo L. pollen is short even under natural conditions; following irradiation, germinability is decreased even further.

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  • Lasiodiplodia theobromae causes decay of star apple fruits (Chrysophyllum cainino) during harvest, transport and storage. If the irradiation dose is higher than 800 Gy, this mold will be controlled.

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  • The aim of the present study was extended from obtaining information about the interaction of gamma rays with Makrofol DE 7-2 track detector to introduce the basis that can be used in concerning simple sensor for gamma irradiation and bio-engineering applications. Makrofol polymer samples were irradiated with 1.25 MeV 60Co gamma radiations at doses ranging from 20 to 1000 kG y. The modifications of irradiated samples so induced were analyzed using UV–vis spectrometry, photoluminescence spectroscopy, and the measurements of Vickers’ hardness.

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  • The study was carried out to assess and optimize the effect of electron beam doses on inactivation/reduction of Salmonella typhimurium and Salmonella enterica inoculated in sterile pork salami samples stored at refrigeration temperature (0-4ºC). Pork salami samples were procured from reputed HACCP accredited and ISO 22000 certified pork processing plant, sterilized, inoculated with 108 CFU/mL of Salmonella typhimurium and Salmonella enterica, packaged in sterile low density polyethylene pouches and subsequently irradiated at the dose rate of 0.5, 0.75, 0.90 and1 kGy.

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  • Annona squamosa L. is a fruit native of India, which has become an important crop because of its tasty flavour, pulp content, nutritional value and antioxidant properties. The aim of this experiment was to evaluate the combined effect of gamma irradiation and post-harvest treatments on quality and shelf life of custard apple (Annona squamosa L.) at College of Horticulture, Rajendranagar, Hyderabad during 2017-18. It consists of 5 treatments viz., T1- 0.4 kGy + GA3 @ 50 ppm, T2-0.4 kGy + GA3 @ 100 ppm, T3-0.6 kGy + GA3 @ 50 ppm, T4- 0.

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  • Starch is the most abundant carbohydrate from the plant source.In different food processing sectors starch plays a vital role, includes thickening, gelling, consistency and shelf stability in various food applications. Irradiation plays an important role on the starch modification, it improves the viscosity of starch and plays a key role in the pasting properties. Irradiation dose was positively correlated to solubility and negatively correlated with relative crystallinity, thermal properties, and pasting properties.

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  • The influence of gamma irradiation on microbial load of different peanut varieties has been assessed. The healthy and mature kernels of peanut variety popular in saurastra region of India viz. GG-20 and TG-37A were naturally contaminated and conditioned with three initial moisture contents (6.0%, 8.5% and 11.0%), w.b. and packed in Poly Propylene (PP) bags of 50μ thickness. These samples were irradiated with different gamma irradiation dose (0 kGy, 2.5 kGy, 5.0 kGy, 7.5 kGy and 10.0 kGy) and stored at ambient temperature for three months.

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  • Dosimetry is of crucial importance in radiation processing of food. Among others, plastic film has been widely used for dosimetry in radiation therapy since its density is quite similar to the equivalent biological materials. In this study, the depth dose distribution was estimated by using gafchromic film for the purpose of dosimetry in food irradiation.

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  • This research investigates the effect of X-ray irradiation doses on the physico-chemical properties of PVC. PVC samples before and after irradiation are transferred in liquid form by using microwave digestion Mars 6 and then X-ray Powder Diffraction (XRD) to determine the structural morphological characteristics of PVC samples. XRD results show that the change of PVC polymer structure depends significantly on a radiation dose.

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  • Brachytherapy Brachytherapy is the direct implantation of radioactive sources into the prostate. It is based on the principle that the deposition of radiation energy in tissues decreases as a function of the square of the distance from the source (Chap. 81). The goal is to deliver intensive irradiation to the prostate, minimizing the exposure of the surrounding tissues. The current standard technique achieves a more homogeneous dose distribution by placing seeds according to a customized template based on CT and ultrasonographic assessment of the tumor and computer-optimized dosimetry.

    pdf5p konheokonmummim 03-12-2010 80 3   Download

  • Colloidal silver nanoparticles were synthesized by Co-60 ray irradiation of Ag+ in aqueous solution containing polyvinyl alcohol (PVA) as stabilizer and 0.5 M ethyl alcohol as free radical (OH• ) scavenger. The effect of Ag+ concentration which varied from 1 to 50 mM on the saturated conversion dose (D) of Ag+ into Ag determined by UV-vis spectroscopy and the size of Ag nanoparticles characterized by transmission electron microscopy (TEM) were investigated. The dependence of D (kGy) and average size (d, nm) of Ag nanoparticles on Ag+ concentration was found out to be as: D (kGy) = 0.

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  • This report presents the estimation of the activation energy (E) values from the thermoluminescence (TL) glow curves showed by the whole glow peak (WGP) method that allows us to distinguish between irradiated and non-irradiated chilli powder samples. The E values of non-irradiated samples maintain 0.65 eV whereas irradiated ones reach 0.84 eV or upper. Furthermore, the E values are obtained from the result of comparison between the chilli powder irradiated with different doses (2, 4, 6 and 8 kGy) stored for 30 days and other unknown chilli powder samples in Vietnam.

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  • The thin film PVA (polyvinyl alcohol) - bromocresol green (∼15µm) dosimeter was made for the applications in radiation technology. It’s parameters before and after gamma irradiation have been studied using optical spectrometer UV-VIS JASCO-V-350 and film densitometer X-Rite Model 301. The results show that the specific wavelength of thin film is ∼ 625nm and the sensitivity of thin film dosimeter is ∼ 0.013 × 10−3 Gy−1 in the dose range from 1 kGy to 140 kGy. The dose response function of dosimeter was clearly described by the theory of energy transfer model.

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  • Gamma rays are known to induce random mutations, which are used to enhance the production of biofilms in bacteria. Therefore, to improve the activity of biofilm formation in wild Bacillus amyloliquefaciens (HM6), this bacterial strain was mutated using five doses of gamma irradiation.

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  • The average bubble size increases and the bubble density decreases with an increasing irradiation temperature from 200C to 350C. Both the average size and density of the bubbles increase with an increasing irradiation dose from 2 dpa to 8 dpa. Bubbles with smaller size and lower density were observed in the SMATed samples but not in the un-SMATed samples irradiated in the same conditions, which indicate that GBs play an important role during irradiation, and sink strength increases as grain size decreases.

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  • The paper shows the main results obtained in terms of neutron spectra at fixed distances from the source as well as their neutron fluence rate (total and direct) and ambient dose equivalent rate.

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  • Radiotherapy for head and neck cancer typically leads to loss of taste among cancer patients. We proposed that loss of taste after irradiation may be due to continued natural taste cell death, paired with temporary interruption of cell replacement. One possible strategy for averting taste loss may be to reduce epithelial cell death, so that cell proliferation is not interrupted. Protein kinase C delta (PKCδ) has been shown to positively regulate apoptosis and/or cell cycle arrest.

    pdf9p quenchua1 04-11-2019 9 0   Download



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