scholarly journals Upgrade of a Highly Sensitive Monitor for Atmospheric Radon Measurement

Atmosphere ◽  
2021 ◽  
Vol 12 (10) ◽  
pp. 1257
Author(s):  
Lei Zhang ◽  
Yucai Mao ◽  
Hao Wang ◽  
Qiuju Guo
Keyword(s):  
Radon Concentration ◽  
Absolute Humidity ◽  
Alpha Particles ◽  
Correction Coefficient ◽  
Measurement Sensitivity ◽  
Radon Measurement ◽  
High Data ◽  
Analysis System ◽  
Long Term Observation ◽  
Atmospheric Radon

Atmospheric radon is an ideal tracer that is widely used in atmospheric science. To meet the need fora continuous online measurement of atmospheric radon concentration, an upgraded radon monitor based on an electrostatic collection method was developed following Iida’s measurement system. Two major improvements have been realized. First, an 18 mm × 18 mm Si-PIN detector and a multi-channel analysis system were used to distinguish different alpha particles. Second, the P2O5 desiccant was replaced by a new membrane drying system, and the influence of humidity was corrected by a humidity correction coefficient. Calibration and comparison experiments were carried out in detail, and a one-year continuous measurement was also performed. Results showed that the measurement sensitivity was evaluated to be 24.3 cph/(Bq·m−3), and the lower level detection limit was 0.2 Bq·m−3 for a 1-h cycle at the absolute humidity of 0.34 g·m−3. The annual average radon concentration of Beijing was 11.1 ± 4.0 Bq·m−3, which changed from 2.8 Bq·m−3 to 30.3 Bq·m−3 between 15 October 2018 and 1 October 2019. The upgraded monitor’s high data acquisition rate and good performance indicate that it is suitable for long-term observation on atmospheric radon.

Processing Panorama Video in Real-time

2014 ◽  
Vol 08 (02) ◽  
pp. 209-227 ◽  
Author(s):  
Håkon Kvale Stensland ◽  
Vamsidhar Reddy Gaddam ◽  
Marius Tennøe ◽  
Espen Helgedagsrud ◽  
Mikkel Næss ◽  
...  
Keyword(s):  
Real Time ◽  
Graphics Processing Units ◽  
Low Cost ◽  
Video Camera ◽  
Wide Field ◽  
High Data ◽  
Data Rates ◽  
Camera Arrays ◽  
Analysis System ◽  
Performance Results

There are many scenarios where high resolution, wide field of view video is useful. Such panorama video may be generated using camera arrays where the feeds from multiple cameras pointing at different parts of the captured area are stitched together. However, processing the different steps of a panorama video pipeline in real-time is challenging due to the high data rates and the stringent timeliness requirements. In our research, we use panorama video in a sport analysis system called Bagadus. This system is deployed at Alfheim stadium in Tromsø, and due to live usage, the video events must be generated in real-time. In this paper, we describe our real-time panorama system built using a low-cost CCD HD video camera array. We describe how we have implemented different components and evaluated alternatives. The performance results from experiments ran on commodity hardware with and without co-processors like graphics processing units (GPUs) show that the entire pipeline is able to run in real-time.

Evidence of precursor phenomena in the Kobe earthquake obtained from atmospheric radon concentration

2006 ◽  
Vol 21 (6) ◽  
pp. 1064-1072 ◽  
Author(s):  
Yumi Yasuoka ◽  
George Igarashi ◽  
Testuo Ishikawa ◽  
Shinji Tokonami ◽  
Masaki Shinogi
Keyword(s):  
Radon Concentration ◽  
Kobe Earthquake ◽  
Atmospheric Radon

scholarly journals Non-parametric detection of atmospheric radon concentration anomalies related to earthquakes

2018 ◽  
Vol 8 (1) ◽  
Author(s):  
Daichi Iwata ◽  
Hiroyuki Nagahama ◽  
Jun Muto ◽  
Yumi Yasuoka
Keyword(s):  
Radon Concentration ◽  
Atmospheric Radon ◽  
Non Parametric

The Alpha Particle Doses Received by Students and Staff in Twenty Schools in the North of Hebron Region - Palestine

2021 ◽  
Vol 14 (4) ◽  
pp. 309-316
Keyword(s):  
Effective Dose ◽  
Radon Concentration ◽  
Annual Effective Dose ◽  
Indoor Radon ◽  
Alpha Particles ◽  
Indoor Radon Concentration ◽  
The North ◽  
Cr 39 Detectors ◽  
Average Effective Dose ◽  
Radon Concentrations

Abstract: The aim of the current study was to measure indoor radon concentration levels and its resulting doses received by the students and staff in schools of the directorate of education in the north of Hebron region- Palestine, during the summer months from June to September (2018), using CR-39 detectors. In this study, a total of 567 CR-39-based radon detectors were installed in the selected schools. The average radon concentrations were found to be 90.0, 66.5 and 58.0 Bqm-3 in Halhul, Beit Umar and Alarrub camp schools, respectively. Based on the measured indoor radon data, the overall average effective dose for the studied area was found to be 0.31 mSvy-1. Reported values for radon concentrations and corresponding doses are lower than ICRP recommended limits for workplaces. The results show no significant radiological risk for the pupils and staff in the schools under investigation. Consequently, the health hazards related to radiation are expected to be negligible. Keywords: Radon concentration, Alpha particles, Annual effective dose, Schools. PACs: 29.40.−n.

scholarly journals Application of the Electret in Alpha Radiation Sensor to Measure the Concentration of Radon in Selected Ambient Conditions

2019 ◽  
Vol 2019 ◽  
pp. 1-9
Author(s):  
Adam Gubanski ◽  
Jan Kupracz ◽  
Paweł Kostyla ◽  
Dominika Kaczorowska ◽  
Jerzy Wrobel
Keyword(s):  
Charge Density ◽  
Radon Concentration ◽  
Radioactive Decay ◽  
Reference Electrode ◽  
Alpha Particles ◽  
Measuring System ◽  
Ambient Conditions ◽  
Alpha Radiation ◽  
Effective Surface ◽  
Radiation Sensor

A novel electret sensor, made from a polytetrafluoroethylene (PTFE) foil, is proposed for monitoring of radon concentration in closed spaces. A triode air system was implemented to form the electret foil. In order to calibrate the electret sensor, the ionization chamber with the electret embedded at its bottom, was placed in an emanation chamber containing radon of known concentration. The change in the effective charge density of the electret resulting from the interaction of the electret sensor with ionizing radiation, make it possible to determine the degree of its response to the radon concentration in the examined environment. The electric charge of the electret sensor was evaluated at the beginning and at the end of the concentration measurement using a field chopper. The measurement of the value of the electric field between the electret and the reference electrode directly corresponds to the effective surface charge density of the electret. The measuring system was calibrated in values of the electret equivalent voltage of Uz. In order to assess the electret properties, both the thermostimulated charge relaxation (TSQ) method and the thermostimulated discharge current (TSDC) method were used to evaluate corresponding parameters. These investigations led to the optimization of the electret formation process for the maximum sensitivity to the effects of alpha particles resulting from radon radioactive decay.

scholarly journals Anomalous radon emanation linked to preseismic electromagnetic phenomena

2007 ◽  
Vol 7 (5) ◽  
pp. 629-635 ◽  
Author(s):  
Y. Omori ◽  
Y. Yasuoka ◽  
H. Nagahama ◽  
Y. Kawada ◽  
T. Ishikawa ◽  
...  
Keyword(s):  
Electric Field ◽  
Power Law ◽  
Radon Concentration ◽  
Damage Evolution ◽  
Atmospheric Electric Field ◽  
Ionospheric Disturbances ◽  
Radon Emanation ◽  
Radon Anomaly ◽  
Large Earthquakes ◽  
Atmospheric Radon

Abstract. Anomalous emanation of radon (222Rn) was observed preceding large earthquakes and is considered to be linked to preseismic electromagnetic phenomena (e.g. great changes of atmospheric electric field and ionospheric disturbances). Here we analyze atmospheric radon concentration and estimate changes of electrical conditions in atmosphere due to preseismic radon anomaly. The increase of radon emanation obeys crustal damage evolution, following a power-law of time-to-earthquake. Moreover, the radon emanation decreases the atmospheric electric field by 40%, besides influencing the maximum strength of atmospheric electric field by 104–105 V/m enough to trigger ionospheric disturbances. These changes are within the ranges observed or explaining electromagnetic phenomena associated with large earthquakes.

scholarly journals SPATIAL VARIABILITY OF INDOOR RADON CONCENTRATION IN SCHOOLS: IMPLICATIONS ON RADON MEASUREMENT PROTOCOLS

2020 ◽  
Vol 191 (2) ◽  
pp. 133-137
Author(s):  
Z Curguz ◽  
G Venoso ◽  
Z S Zunic ◽  
D Mirjanic ◽  
M Ampollini ◽  
...  
Keyword(s):  
Spatial Variability ◽  
Radon Concentration ◽  
Indoor Radon ◽  
Reference Level ◽  
Indoor Radon Concentration ◽  
Radon Measurement ◽  
Ground Floor ◽  
Preliminary Study ◽  
The Republic ◽  
Radon Measurements

Abstract The requirements about radon measurements in schools and public buildings included in most of the national and international legislations are generally restricted to all the rooms located at the ground floor and basement, assuming the soil beneath the building as the main source of indoor radon. In order to verify such an assumption for small buildings having at maximum two floors, a preliminary study was performed in 50 schools located in 15 municipalities of the Republic of Srpska. Results of this study suggest that a protocol requiring measurements at the ground floor only may be considered adequate. Due to the high radon spatial variability for rooms at the ground floor, it is preferable to require measurements in a high number of rooms (preferably in all of them) in order to assess the compliance with the reference level established by the legislation.

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