检索结果-南通市图书馆

Radon Gas Measurements through Geiger and Sodium Iodide Scintillator——Study Efficiency Comparison

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Science and Engineering(A) 2017年第5期6卷 270-275页

作者： Inacio malmonge martin Marcelo Pego Gomes Physics Department Technological Institute of Aeronautics--4TA S6o Jos~ dos Campos SP 12228-900 Brazil

With the use ofa Geiger proportional counter with sensor tube of Russian and Chinese origin, a comparison was made in this work between measurements of environmental ionizing radiation with these detectors and a sodium iodide scintillator activated with TI （Thallium NaI）. Through measurements carried out in a room located inside a tower 25 meters high on the ITA （Technological Institute of Aeronautics） campus, it was possible to study the efficiency of the three instruments for the environmental measurement of ionizing radiations at that location. Between March 7th and June 2nd of 2017, in that region, nine intense and weak rains were observed with 12 cold fronts coming from southern Brazil. Radiation measurements and the local meteorology involved are analyzed in this work to verify possible correlations.

关键词： Ionizing radiation rain radon gas.

Monitoring of Ionizing Radiation from Radon Gas （Rn-222） in Sao Jose Dos Campos--Brazil Region

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Science and Engineering(B) 2013年第8期2卷 449-452页

作者： Inacio malmonge martin Franklin Andrade da Silva Marcelo Pego Gomes Physics Department of the ITA (Technological Institute of Aeronautics) Sao Jose dos Campos 12228-900 Brazil Department of Mechanical Engineering University of Taubate Taubate 12060-440 Brazil IAE (Institute of Aeronautics and Space) Sao Jose dos campos 12226-900 Brazil

It is common knowledge that we live in an environment which comprises ionizing radiation （X-rays, gamma rays）. These radiation in normal situations is produced by natural phenomena such as cosmic rays from different sources in Universe and the decay of radioactive elements present in the Earth planet atmosphere and crust. Ionizing radiation can also be produced by human activities such as those related to nuclear power generation and use in medicine and industry. Although ionizing radiations are part of our daily lives, few students or researchers have the opportunity to perform measurements and observations of the background radiation. To overcome this deficiency in education, we started a pilot project that propose measures and observations of environmental radiation background with students of the ITA （Technological Institute of Aeronautics, Silo Paulo）. Using compact and portable detector to observe gamma radiation like described in this work, many graduate students can participate.

关键词： Atmosphere radon gas gamma radiation.

Daily Variability of Radon Gas in Brazilian Tropics Near Ground Level Surface

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Science and Engineering(A) 2015年第10期4卷 516-521页

作者： Inacio malmonge martin Marcelo Pego Gomes Bogos Nubar Sismanoglu Nicolas Cruvinel Lindo Department of Physics Technological Institute of Aeronautics Sao Jose dos Campos 12228-900 Brazil

By monitoring the ionizing radiation from minute to minute in S^o Jos6 dos Campos, SP, Brazil （230 S, 450 W） using Geiger counter, during January to August 2015, it has confirmed the presence of radon gas in these measures. The observation confirms the existence of a periodicity of 24 hours through the technique （Fast Fourier Transform） applied to the data set, and this cycle can be better visible in longer dry periods. On rainy days or with heavy fog in the region, this periodicity is modified or even disappears. As Geiger do not detect alpha particles due to absorption in the walls of the sensor tube, it measured X and gamma rays coming from the radon gas progeny. Radon gas （222Rn） has a half-life of 19.7 minutes to decays in 214Bi emitting gamma ray energy （45%） with 0.609 MeV which is monitored daily by Geiger. Also 222Rn decays in 26.8 minutes in 214pb giving （37%） with 0.35 MeV and others with less energy. It is confirmed the good performance ofa Geiger tube with LND 712 working with about 500 VDC rated voltage.

关键词： Geiger radon gas ionizing radiation.

Correlation between Rainfall and Cold Fronts with Gamma Ray Measurements near Ground Level in Southeastern Brazil

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Science and Engineering(B) 2017年第3期6卷 115-120页

作者： Inacio malmonge martin Marcelo Pego Gomes Marco Antonio Ferro Franklin Andrade Silva Physics Department Technological Institute of Aeronautics--tTA Sao Jose dos Campos SP 12228-900 Brazil Aeronautical and Space Institute--IAE Sao Jose dos Campos SP 12228-900 Brazil

Gamma radiation measurements integrated between 200 keV and 10.0 MeV were performed between 03/07/2017 and 05/24/2017 from a tower of 25 meters of altitude in the region of S^o Jos6 dos Campos, SP, Brazil. Throughout this period, there were 9 intense and moderate rains with 11 arrivals of cold fronts coming from southern Brazil. Through measurements of gamma radiation integrated in the energy range mentioned above, the presence of these meteorological parameters and their variations in the region can clearly be observed. Through a potential calibration between the measured gamma radiation intensity and the observed rainfall intensity, it is possible to monitor rains by time interval using this gamma ray detector. Another very important parameter for the region consists of monitoring the number of passages of cold fronts that interfere in the local climatology. This low-cost, easy-to-operate technique can be applied and used in any tropical and equatorial region of the earth＇s surface.

关键词： Ionizing radiation rain meteorological parameters

Study of a Portable Experimental Set for the Monitoring of Ionizing Radiation in the Tropical Region of Brazil

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Science and Engineering(A) 2017年第3期6卷 144-148页

作者： Inacio malmonge martin Marcelo Pego Gomes Rodrigo Rezende Fernandes Carvalho and Rafael Gomes Physics Department Technological Institute of Aeronautics-ITA Sao Jose dos Campos SP 12228-900 Brazil

The Geiger is a proportional counter that detects the ambient ionizing radiation using a sensor tube and an associated electronics that allows feeding the desired voltage to the tube and acquiring the data in a certain time interval. With a sensor tube of Chinese and Russian origin and associated electronics based on the Arduino system, an experimental set of very low cost and easy handling for the monitoring of the local environmental ionizing radiation was set up. The main objective of this work is to disseminate this very low cost technique for the environmental study in secondary schools in Brazil.

关键词： Ionizing radiation environmental study gamma radiation measurements.

Changes in Low Energy Neutron Counts Rate near Ground Level Associated to Steady Rain

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Science and Engineering(A) 2016年第6期5卷 294-297页

作者： Inacio malmonge martin Marcelo Pego Gomes Matheus Carlos da Silva Bogos Nubar Sismanoglu Department of Physics Aeronautical Institute of Technology Sao Jose dos Campos 12228-900 Brazil

Measurements of neutron count rate （0.025 eV to 10 MeV） at ground level were performed with a single free （He-3） tube detectorthat is located near ground level in Aeronautical Institute of Technology （ITA） Silo Jos6 dos Campos, SP, Brazil. The data were collected uninterruptedly since February 28, 2016 to March 11, 2016. Based on the analysis of data obtained in this period, was possible to observe the occurrence of events, backscattering for example,with significant increases in the neutron count rate during about 3 days of steady rain for all nearby regions. These events seem to be correlated with changes in local weather conditions such as cloud coverage or rain-precipitation of weak intensity. It was reported that the non-observation of a single event seems to be an indicative of the production of a burst of neutrons by a lightning discharge near the detector. Some explanations about the increasing of low energy neutrons are suggested in this article.

关键词： Neutron counts steady rain backscattered neutron.

Monitoring of Ionizing Radiation and Rain Intensity during May to October 2015 in S^o Jos~ dos Campos, Brazil

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Science and Engineering(B) 2016年第3期5卷 115-117页

作者： Inacio malmonge martin Thiago Adriano dos Santos Franklin Andrade da Silva Marcelo Pego Gomes Bogos Nubar Sismanoglu Physics Department Institute Technological of Aeronautics (1TA) Sao Jose dos Campos 12228-900 Brazil

Radiation affects the environment and local human activity in any location of the earth＇s surface. Due to this fact, the aim of this study was to monitor the ionizing radiation and rain intensity using portable devices. During May 23 to October 2, 2015, it was made measures the intensity of gamma radiation from 30 keV to 10.0 MeV at a height of 25 meters in Sao Jos6 dos Campos city, SP, Brazil. It was used a crystal of sodium iodide scintillator 3 - 3 inches coupled to a photomultiplier and associated electronic. The measurements were made continually with minute＇s interval throughout the period and it was monitored rain intensity every minute at the same height of the tower. In this job, it was possible to correlate rain-radiation and it was observed which gamma radiation has a directly proportional relationship with rain and visible frequency of 1 day.

关键词： Gamma radiation rain intensity radon gas gamma scintillator.

Monitoring of Ionizing Radiation Using Geiger Instrument during February to April 2015 in Sao Jose Dos Campos, SP, Brazil

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Science and Engineering(A) 2015年第6期4卷 282-285页

作者： Inacio malmonge martin Marcelo Pego Gomes Bogos Nubar Sismanoglu Thiago Adriano Dos Santos Joao Paulo Correa Department of Physics Technological Institute of Aeronautics Sao Jose Dos Campos 12228-900 Brazil Department of Mechanical Engineering University of Taubate Taubate 12060-440 Brazil

Measures of ionizing radiation were observed in a tower which is 20 meters above the ground relative height. They show a distinct period of 24 hours oscillation during this Februaryl 1 to April 11, 2015. It is suggested that these oscillations originate from radon gas （222Rn） vented from the ground floor. One Russian specific Geiger tube with associated electronics developed at ITA was used, Monitoring of ionizing radiation from 30 keV to l0 MeV shows that the X and gamma rays up to 3.0 MeV is prevalent in the region comes from the Radon gas 222Rn that decay in 214Bi and 214pb in the energies of the gamma rays 0.269, 0.609 and 1.05 MeV respectively. Then, with this simple, portable instrument was possible to monitoring the dynamics of radon gas in the region every interval minutes.

关键词： Atmosphere radon gas gamma radiation.

Simultaneous Measurements of Rainfall Intensity, Low Energy Neutrons and Gamma Radiation in Sao Jose Dos Campos, SP, Brazil

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Science and Engineering(B) 2013年第11期2卷 643-647页

作者： Marcelo Pego Gomes Inacio malmonge martin Mauro Angelo Alves Bogos Nubar Sismanoglu Marco Antonio S. Ferro Marcos Pinto Flavio Antonio IAE (Institute of Aeronautics and Space) Sao Josedos Campos 1222 6900 Brazil Physics Department ITA (the Technological Institute of Aeronautics) Sao Jose dos Campos 1222 8900 Brazil

The article aims to study the possible correlation between the presence and intensity of rainfall X- and T-radiation and low energy neutrons at one specific location in S[io Jos6 dos Campos, SP, Brazil. Monitoring of these parameters was carried out from end February to half of June 2013 just in Physics Department of ITA （Technological Institute of Aeronautics）. By correlating the data of measurements of intensity of X and ）,-radiations with the rainfall it has been found that this meteorological parameter had a significant influence on the background of these radiation profile. A possible reason for this fact is associated with the presence of radon gas in the environment that is dragged to the surface during the occurrences of local rainfall. In relation neutrons, it was possible to note that the rainfall has small influence on this parameter measures.

关键词： X- and y-radiation low energy neutron rainfalls experimental measurements.