Sensitive Radiation Sensor Research Articles

A distributed and interconnected network of sensors for environmental radiological monitoring

The W-MON project aims to improve and automatize the control of the presence of radioactive material in conventional waste containers at CERN using a distributed network of interconnected low-power radiation sensors. The key development is the integration of a lightweight but sensitive radiation sensor in a powerful network that allows continuous data recording, transfer and storage in a database for alarm triggering and subsequent data analysis. The Chiyoda D-shuttle personal dosimeter was used as proof-of-concept. Extensive tests performed with the commercial version of the D-shuttle showed that its robustness, stability under variable thermal conditions, high sensitivity and hourly dose logging capabilities make it a strong candidate for the project. To comply with the requirements of remote operation and wireless data transmission to a central server, a customized version of the D-shuttle has been developed. Two additional radiation sensors are also currently being considered. The sensors have been coupled to a custom-made communication board allowing for long-range low-power LoRa wireless data transmission. A centralized IoT (Internet of Things) end-to-end data architecture has been developed for real-time monitoring and visualization of the radiation level in waste containers before the final integration into REMUS, the overall CERN Radiation and Environment Monitoring Unified Supervision service.

Investigation of transparent pyramidal covers effect to PV power output using detected wireless sensors incident radiation

A new approach is presented to enhance the solar radiation intensity incident over the solar panel by using a transparent cover of pyramidal shapes. The pyramidal cover shape is manufactured of Polymethylmethacrylate dielectric material. The normal height of each pyramid is considered as a ratio of the base length. This ratio is considered in the present study to be 0.5, 1, and 1.5. The effect of the pyramidal covers on the solar panel voltage has been studied at different conditions using wireless sensitive radiation sensor. The experimental results confirm that the pyramidal cover shape causes the improvement to the solar panel output voltage by 4.2% when covering all the panel with pyramids of R = 1 with a light incidence angle of 90o when the light rays come parallel to the panel surface. This improvement is found to decrease when covering fewer areas of the solar panel, which leads to fewer incidence angles. Furthermore, it is found that the distance between the light source and the panel is proportional to the output voltage improvement ratio compared to the panels output voltage without pyramidal cover. A mathematical model has been presented to prove the concept of increasing the electric and magnetic fields of the incident radiation from the sun in presence of the transverse transparent barrier. Moreover, a mathematical ray tracking model is presented and validated by a maximum relative error of 14.8%.

Fabrication of a Si Photodiode for Position Sensitive Radiation Detection

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> We have fabricated a position sensitive radiation detector by creating radiation damage regions in a Si photodiode. Radiation damage was created in layers at a depth of several <formula formulatype="inline"><tex>$\mu$</tex> </formula>m by <formula formulatype="inline"><tex>$^{7}$</tex></formula>Li and <formula formulatype="inline"><tex>$^{16}$</tex></formula>O ion beams which had an energy between 2 and 4 MeV. Ions were focused and scanned using a nuclear microprobe facility. The ion beam induced charge (IBIC) signals created in diodes during irradiation were simultaneously measured to monitor the exact ion beam fluence and analyzed to estimate the amount of defects created. By controlling the ion microbeam scanning system, graduated and position dependent radiation damage was produced in different micro-patterns. Such structures may be used as a simple position sensitive radiation sensor. </para>

Computer simulation of positron-induced radiation effects in Dynamic RAMs

The sensitivity of computer memory devices to single event upsets (SEUs) caused by ionizing radiation provided the foundation for a proposed dynamic Random Access Memory (DRAM) based position sensitive radiation sensor, which is likely to be used for studying the movement of radiolabelled pharmaceuticals in biological tissues in vitro using positron emitting tracers. By making use of the ITS [8] Monte Carlo code, simulations of the positron interactions with the materials consisting a DRAM device have been carried out for four positron emitters, i.e. 18F, 13N, 11C and 15O, which are of interest in studying biological functions. The device geometry modelling and the positron energy spectra of the above emitters obtained by utilizing the Fermi-Kurie plots have been successfully applied. Finally, the energy deposition of positrons within the different layers of the DRAMs were investigated. The aim of this paper is to present and discuss the results of these simulations.