Mass analyzed highly charged ion beams of energy ranging from a few keV to a few MeV plays an important role in various aspects of research in modern physics. In this paper a unique low energy ion beam facility (LEIBF) set up at Nuclear Science Centre (NSC) for providing low and medium energy multiply charged ion beams ranging from a few keV to a few MeV for research in materials sciences, atomic and molecular physics is described. One of the important features of this facility is the availability of relatively large currents of multiply charged positive ions from an electron cyclotron resonance (ECR) source placed entirely on a high voltage platform. All the electronic and vacuum systems related to the ECR source including 10 GHz ultra high frequency (UHF) transmitter, high voltage power supplies for extractor and Einzel lens are placed on a high voltage platform. All the equipments are controlled using a personal computer at ground potential through optical fibers for high voltage isolation. Some of the experimental facilities available are also described.
Background: Administration of Suxamethonium, laryngoscopy and intubation is associated with rise in intraocular pressure (IOP). The need to attenuate rise in IOP is of utmost importance, especially in patients with perforating injury of the eyeball. The present study was undertaken to compare the effectiveness of intravenous Dexmedetomidine 0.4μg/kg and oral Clonidine 3μg/kg in attenuating the rise in IOP following administration of suxamethonium, laryngoscopy and intubation.Methods: 150 patients of ASA I or II, aged between 18-60 years, who were posted for elective non-ophthalmic surgery requiring general anaesthesia were included in this study. Patients were randomly divided into 3 groups with 50 patients in each group. Group-D: Received 0.4μg/kg IV dexmed in 10ml sterile water, over 10 min before induction. Group-C: Received 3μg/kg oral clonidine two hours prior to surgery. Group-S: Control group.Results: IOP, MAP, and HR were recorded at baseline, before induction, after induction, 1 min, 3 min and 5 min after administration of suxamethonium. Although Suxamethonium laryngoscopy and intubation increased IOP in all the 3 groups there was significant reduced rise in IOP noted in dexmed group and clonidine group compared to study group (p= <0.001). Furthermore, patients in dexmed group had lesser rise in IOP compared to clonidine group (p= <0.001).Conclusions: We concluded that both intravenous dexmedetomidine 0.4μg/kg and oral clonidine 3μg/kg, significantly attenuated the rise in IOP associated with administration of suxamethonium, laryngoscopy and intubation. However intravenous dexmedetomidine proved better than oral clonidine in attenuating the rise in IOP.
Purpose: To examine the correspondence between half value layers (HVLs) measured by traditional methods to those obtained by an instrument that reports HVLs with a single open beam. Methods: The HVL was obtained from generating a transmission curve at 60, 80, and 100 kVp in the radiographic range and typically used kVp and target/filter combinations in the mammography range. These HVLs were compared to the ones obtained by instruments which provide direct value with a single open beam. Unfors and Neromax instruments were used to obtain HVL by direct single measurement. A three phase table top radiographic unit was used. Measurements were performed in good geometry using Al 115 H filters supplied Gammex Corporation. This filter is 99.9% pure aluminum. Results: By and large there is good agreement between the HVL obtained by the two methods for regulatory compliance applications. However, there are minor differences when one is interested in a precise value for scientific applications. Conclusions: One can use these direct HVL reporting instruments for routine regulatory compliance measurements.
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