A Magnetically Enhanced Wireless Micro-geiger Counter
نویسندگان
چکیده
This paper reports a micromachined Geiger counter with integrated permanent magnets that enhance the RF transmission from the discharges initiated by incident beta particles. With the intent of wireless sensing within the ultra wideband (UWB) spectrum, the transmission in the 2.0-2.8 GHz frequency range is investigated. The device consists of a 1x2 cm micromachined glass/Si cavity sandwiched between two miniaturized NdFeB rare earth magnets. Several different magnet orientations as well as two different shapes of magnets (square and ring) are investigated. The square and ring magnets have a maximum flux density of 2.40 and 0.91 kG, respectively. Preliminary results show that the RF spectra in the presence of Sr and Tl sources of 0.1-1.0 μCi increased by ~8 relative dBμV (compared to non-magnetic devices) at a distance of 5 cm from the device. The radiation pattern emitted by the microdischarges is measured in the plane of the device. Wireless spectra from electrostatic discharges are also reported.
منابع مشابه
Low cost Micro-Coulter counter with hydrodynamic focusing
We report on the fabrication and characterization of a low-cost micro-Coulter counter fabricated from biocompatible materials (Poly-dimethylsiloxane, glass and gold) and incorporating hydrodynamic focusing. The developed micro-Coulter counter offers a low-cost alternative to equivalent existing devices and, thanks to the hydrodynamic focusing, provides high versatility, being able to probe part...
متن کاملمحاسبه ثابت کالیبراسیون شمارنده فعالسازی با پوشش نقرهای و مقایسه آن با نتایج تجربی بهمنظور اندازهگیری بهره نوترونی در دستگاه پلاسمای کانونی
The silver activation counters are commonly used for pulsed-neutron yield measurements especially in plasma focus devices. The counter normally consists of a Geiger-Muller tube along with silver foils and polyethylene (as a moderator), which is calibrated against an Am-Be radioisotope neutron source. The neutrons, after being slowed-down in the polyethylene, activate the silver foils. By measur...
متن کاملAn improved Geiger-counter arrangement for determination of radium content.
Geiger-counter apparatus in which several counters may be placed in any position relative to each other is described. A circular arrangement of counters to give a counting rate approximately independent of the position of a so urce near the center of the circle is discussed. The relation of the I osition of the source to the counting rate of a single Geiger counter is discus ed. A method of cal...
متن کاملLocalization of intestinal bleeding using a miniature Geiger counter.
This study reports the practical problems involved in the use of a miniature Geiger counter to detect the site of bleeding into the intestine. The observations so far have been made in dogs but its possible application in man is proposed.
متن کاملControlled Magnetic Propulsion of Floating Polymeric Two-Dimensional Nano-Objects
Soft-bodied magnetically actuated microrobots could be developed by including controlled dispersions of magnetic nanoparticles into polymeric micro-fabricated structures. The characterization and actuation of magnetically active soft-bodied microrobots by tailored magnetic fields is, thus, a key issue for the design, full control and further development of these mobile micro-systems. In this wo...
متن کامل