Pub Date : 2023-01-01DOI: 10.4236/detection.2023.102002
Dabo S. I. Agba, Ponaho Kezo, Issa Konaté
In the metrology of radon, an environmental lung carcinogen, the integrated measurements necessary for epidemiological studies are made very often using the tracks detector LR 115 type 2. For dosimetric analysis, the etched tracks from radon alpha particles on this detector are usually counted by means of an optical microscope or a spark counter. An optimal reading of the track densities which must be converted into radon concentrations, can’t be done without a good mastery of the mode of operation and use of these devices. Furthermore, investigations to know as to whether or not each of those can be used to determine radon concentration are necessary. These are the objectives of the present work in which LR 115 samples exposed to radon for at least 3 months, were chemically developed under standard conditions and read. The track densities obtained with the microscope are very much higher than those of the counter for each sample. These results are consistent with those published by other authors. However, each of these devices can be used interchangeably for alpha tracks counting, as both provide radon concentrations with a very good linear correlation coefficient of 0.95 taking into account their respective calibration factors for the reading of this detector. In addition, the saturation phenomenon for the spark counter reading of LR 115 detector occurs beyond 11,000 tr/cm2, a density never reached during our environmental radon measurements.
{"title":"Comparative Alpha Tracks Counting Using an Optical Microscope and a Spark Counter","authors":"Dabo S. I. Agba, Ponaho Kezo, Issa Konaté","doi":"10.4236/detection.2023.102002","DOIUrl":"https://doi.org/10.4236/detection.2023.102002","url":null,"abstract":"In the metrology of radon, an environmental lung carcinogen, the integrated measurements necessary for epidemiological studies are made very often using the tracks detector LR 115 type 2. For dosimetric analysis, the etched tracks from radon alpha particles on this detector are usually counted by means of an optical microscope or a spark counter. An optimal reading of the track densities which must be converted into radon concentrations, can’t be done without a good mastery of the mode of operation and use of these devices. Furthermore, investigations to know as to whether or not each of those can be used to determine radon concentration are necessary. These are the objectives of the present work in which LR 115 samples exposed to radon for at least 3 months, were chemically developed under standard conditions and read. The track densities obtained with the microscope are very much higher than those of the counter for each sample. These results are consistent with those published by other authors. However, each of these devices can be used interchangeably for alpha tracks counting, as both provide radon concentrations with a very good linear correlation coefficient of 0.95 taking into account their respective calibration factors for the reading of this detector. In addition, the saturation phenomenon for the spark counter reading of LR 115 detector occurs beyond 11,000 tr/cm2, a density never reached during our environmental radon measurements.","PeriodicalId":68695,"journal":{"name":"检测(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135609324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.4236/detection.2022.93003
R. Mejri, T. Aguili
{"title":"Modeling of Radiating Aperture Using the Iterative Method","authors":"R. Mejri, T. Aguili","doi":"10.4236/detection.2022.93003","DOIUrl":"https://doi.org/10.4236/detection.2022.93003","url":null,"abstract":"","PeriodicalId":68695,"journal":{"name":"检测(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70483627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.4236/detection.2022.91001
Weiwei Huang, Yanan Hu, Jinjun Zhu, Zenan Cen, Jiali Bao
{"title":"The Measurement and Evaluation of the Electromagnetic Environment from 5G Base Station","authors":"Weiwei Huang, Yanan Hu, Jinjun Zhu, Zenan Cen, Jiali Bao","doi":"10.4236/detection.2022.91001","DOIUrl":"https://doi.org/10.4236/detection.2022.91001","url":null,"abstract":"","PeriodicalId":68695,"journal":{"name":"检测(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70482737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.4236/detection.2022.92002
Cui-rui Zhang
{"title":"Direct Conversion X-Ray Detectors with High Sensitivity at Low Dose Rate Based on All-Inorganic Lead-Free Perovskite Wafers","authors":"Cui-rui Zhang","doi":"10.4236/detection.2022.92002","DOIUrl":"https://doi.org/10.4236/detection.2022.92002","url":null,"abstract":"","PeriodicalId":68695,"journal":{"name":"检测(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70483521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.4236/detection.2022.94004
S. O. Anyikwa, O. Ndukwe, Theresa Chinwendu Umeojiakor, P. Nnaji, Ndidiamaka Martina Amadi
{"title":"Monitoring and Evaluation of Air Pollution at Ohaji/Egbema Flow Station and Its Environs via GPS in Ohaji Egbema Lga, Imo State Nigeria","authors":"S. O. Anyikwa, O. Ndukwe, Theresa Chinwendu Umeojiakor, P. Nnaji, Ndidiamaka Martina Amadi","doi":"10.4236/detection.2022.94004","DOIUrl":"https://doi.org/10.4236/detection.2022.94004","url":null,"abstract":"","PeriodicalId":68695,"journal":{"name":"检测(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70483179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.4236/DETECTION.2021.81001
D. S. Agba, K. Djagouri, B. L. Gogon, A. A. Koua
In this study, we used strippable LR 115 type 2 which is a Solid State Nuclear Track Detector (SSNTD) widely known for radon gas detection and measurement. The removed thickness of the active layer of samples of this SSNTD, were determined by measuring the average initial thickness (before etching) and residual thickness after 80 to 135 minutes chemical etching in the standard conditions, using an electronic comparator. These results allowed the calculation of the bulk etch rate of this detector in a simple way. The mean value obtained is (3.21 ± 0.21) μm/h. This value is in close agreement with those reported by different authors. It is an important parameter for alpha track counting on the sensitive surface of this polymeric detector after chemical etching because track density depends extremely on its removed layer. This SSNTD was then used for environmental radon gas monitoring in Côte d’Ivoire.
{"title":"Bulk Etch Rate of LR 115 Polymeric Radon Detector","authors":"D. S. Agba, K. Djagouri, B. L. Gogon, A. A. Koua","doi":"10.4236/DETECTION.2021.81001","DOIUrl":"https://doi.org/10.4236/DETECTION.2021.81001","url":null,"abstract":"In this study, we used strippable LR 115 type 2 which is a Solid State Nuclear Track Detector (SSNTD) widely known for radon gas detection and measurement. The removed thickness of the active layer of samples of this SSNTD, were determined by measuring the average initial thickness (before etching) and residual thickness after 80 to 135 minutes chemical etching in the standard conditions, using an electronic comparator. These results allowed the calculation of the bulk etch rate of this detector in a simple way. The mean value obtained is (3.21 ± 0.21) μm/h. This value is in close agreement with those reported by different authors. It is an important parameter for alpha track counting on the sensitive surface of this polymeric detector after chemical etching because track density depends extremely on its removed layer. This SSNTD was then used for environmental radon gas monitoring in Côte d’Ivoire.","PeriodicalId":68695,"journal":{"name":"检测(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70482659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-25DOI: 10.4236/detection.2019.71001
Jamiu Idowu Lawal
Natural radionuclides content in granite from eight functional quarries in Osun State, Southwestern Nigeria was assessed. Eighty granite samples comprise ¾ inches. ½ inch and stone-dust were collected from Wolid, Slava, Ayofe, Espro, Ife/Modakeke, Krystal Vountein, Clario and Omidiran quarries in the State. Measurement was done using a high purity germanium (HPGe) detector. The statistical analysis was carried out using Statistical Package for Social Sciences (SPSS) software to determine if granite size has an impact on the activity concentrations. The results revealed that the mean activity concentrations of 238U (12.64 ± 1.89 Bq·kg -1) and 232Th (16.93 ± 2.46 Bq·kg -1) were highest in ¾ inch granite and lowest in stone-dust (5.01 ± 0.77 and 8.97 ± 1.37 Bq·kg -1 respectively), whereas 40K is highest in the ¾ inches (266.19 ± 35.53 Bq·kg -1) and lowest in ½ inches (151.85 ± 25.09 Bq·kg -1) granite. Espro has the highest (23.75 ± 3.74 Bq·kg -1) while Wolid has the lowest (4.11 ± 0.73 Bq·kg -1) 238U activity concentration and Slava has lowest for 232Th (8.21 ± 1.12 Bq·kg -1) and 40K (109.54 ± 11.06 Bq·kg -1). The radiological hazard parameters such as absorbed dose, annual effective dose radium equivalent, gamma index, external index, and internal index, were calculated to assess the radiation hazards associated with granite samples. The results obtained are lower than the recommended limits. The results were compared with the published data of other countries. Although, all the calculated radiation hazard indices were lower than the permissible limits. Therefore, people working in the quarries, granite end-users and the general public are safe from radiological health risks from the quarries, since there is no significant health hazard. The research will give reliable information on activity concentrations of natural radionuclides in granite rocks, contribute to a better understanding of radioactivity distribution in granite, and develop standards.
{"title":"Natural Radionuclides Content in Granites from Operational Quarry Sites","authors":"Jamiu Idowu Lawal","doi":"10.4236/detection.2019.71001","DOIUrl":"https://doi.org/10.4236/detection.2019.71001","url":null,"abstract":"Natural radionuclides content in \u0000granite from eight functional quarries in Osun State, Southwestern Nigeria was assessed. Eighty \u0000granite samples comprise ¾ inches. ½ inch and stone-dust \u0000were collected from Wolid, Slava, Ayofe, Espro, Ife/Modakeke, Krystal Vountein, \u0000Clario and Omidiran quarries in the State. Measurement was done using a high \u0000purity germanium (HPGe) detector. The statistical analysis was carried out \u0000using Statistical Package for Social Sciences (SPSS) software to determine if \u0000granite size has an impact on the activity concentrations. The results revealed \u0000that the mean activity concentrations of 238U (12.64 ± 1.89 Bq·kg -1) and 232Th (16.93 ± 2.46 Bq·kg -1) were highest in ¾ inch granite \u0000and lowest in stone-dust (5.01 ± 0.77 and 8.97 ± 1.37 Bq·kg -1 respectively), whereas 40K is highest in the ¾ inches (266.19 ± 35.53 \u0000Bq·kg -1) and lowest in ½ inches \u0000(151.85 ± 25.09 Bq·kg -1) granite. Espro has the highest (23.75 ± 3.74 Bq·kg -1) while Wolid has the lowest (4.11 ± 0.73 Bq·kg -1) 238U activity concentration and Slava has \u0000lowest for 232Th (8.21 ± 1.12 Bq·kg -1) and 40K \u0000(109.54 ± 11.06 Bq·kg -1). The radiological hazard parameters such as absorbed \u0000dose, annual effective dose radium equivalent, gamma index, external index, and internal index, were calculated to assess the radiation hazards \u0000associated with granite samples. The results obtained are lower than the \u0000recommended limits. The results were compared with the published data of other \u0000countries. Although, all the \u0000calculated radiation hazard indices were lower than the permissible limits. \u0000Therefore, people working in the quarries, granite end-users and the \u0000general public are safe from radiological health risks from the quarries, since \u0000there is no significant health hazard. The research will give reliable \u0000information on activity concentrations of natural radionuclides in granite \u0000rocks, contribute to a better understanding of radioactivity distribution in \u0000granite, and develop standards.","PeriodicalId":68695,"journal":{"name":"检测(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43710423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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