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Analysis of Indoor Radon Distribution Within a Room By Means of Computational Fluid Dynamics (CFD) Simulation 基于计算流体力学(CFD)模拟的室内氡分布分析
Journal of Nuclear Physics, Material Sciences, Radiation and Applications Pub Date : 2020-02-28 DOI: 10.15415/jnp.2020.72010
A. L. Flores, R. Palomino-Merino, V. Castaño, Guillermo Espinosa
{"title":"Analysis of Indoor Radon Distribution Within a Room By Means of Computational Fluid Dynamics (CFD) Simulation","authors":"A. L. Flores, R. Palomino-Merino, V. Castaño, Guillermo Espinosa","doi":"10.15415/jnp.2020.72010","DOIUrl":"https://doi.org/10.15415/jnp.2020.72010","url":null,"abstract":"Radon gas is recognized by international organizations such as the United States Environmental Protection Agency (US-EPA) as the main contributor of radiation environmental to which human beings are exposed. Therefore, the evaluation of indoor radon concentration is a matter of public interest. The emanation and the income of the gas inside a room will generate a negative impact on the quality of the air when the place is not properly ventilated. Understanding how this gas will be distributed inside the room will allow to predict the spatial and temporal variations of radon levels and identify these parameters will provide important information that researchers can be used for calculate radiation dose exposure. Consequently, this studies can prevent a health risk for the people that live or work within the room. Currently, several researchers use the technique called Computational Fluid Dynamics (CFD) to simulate the distribution of gas radon, making use of the various commercial programs that exist in the market. In this work, three simulations were developed in rooms that have a similar geometry but different dimensions, in order to observe how the gas is distributed inside a closed space and to analyze how this distribution varies when the volume of the place is increased. The results show that as the volume of the site increases the radon is mitigated more rapidly and therefore has lower levels of concentration of this gas, as long as the level of radon emanation is kept constant.","PeriodicalId":16534,"journal":{"name":"Journal of Nuclear Physics, Material Sciences, Radiation and Applications","volume":"34 1","pages":"89-95"},"PeriodicalIF":0.0,"publicationDate":"2020-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78774493","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}
引用次数: 1
Characterizing a Mini Gamma Detector 小型伽玛探测器的特性
Journal of Nuclear Physics, Material Sciences, Radiation and Applications Pub Date : 2020-02-28 DOI: 10.15415/jnp.2020.72020
E. Márquez-Quintos, E. Moreno-Barbosa, J. E. Espinosa, B. D. C. Alonso, Margarita Amaro Aranda, R. P. Merino
{"title":"Characterizing a Mini Gamma Detector","authors":"E. Márquez-Quintos, E. Moreno-Barbosa, J. E. Espinosa, B. D. C. Alonso, Margarita Amaro Aranda, R. P. Merino","doi":"10.15415/jnp.2020.72020","DOIUrl":"https://doi.org/10.15415/jnp.2020.72020","url":null,"abstract":"There are several types of gamma radiation detectors, which have different characteristics depending on its use. We designed and instrumented a gamma detector for low energies of a small and portable size to obtain spectrum from radioactive sources and from that analyze each spectrum. This instrument basically consists of a scintillator crystal coupled to a SiPM this in turn coupled to a PCB card designed with capacitors and resistors for a better signal, a voltage source of 29 volts. For signal acquisition the system must be connected to an oscilloscope this in turn is controlled by a script developed in Python. For the calibration radioactive isotopes with the same dimensions were used, caesium-137 (Cs-137), cobalto-60 (Co-60), sodium-22 (Na-22) and manganese-54 (Mn-54) as gamma ray emission.","PeriodicalId":16534,"journal":{"name":"Journal of Nuclear Physics, Material Sciences, Radiation and Applications","volume":"44 1","pages":"159-163"},"PeriodicalIF":0.0,"publicationDate":"2020-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73863217","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}
引用次数: 1
A Data Mining Perspective of XRF Elemental Analysis from Pueblo People’s Pottery 普韦布洛人陶器XRF元素分析的数据挖掘视角
Journal of Nuclear Physics, Material Sciences, Radiation and Applications Pub Date : 2020-02-28 DOI: 10.15415/jnp.2020.72016
M. Castro-colin, E. Ramirez-Homs, Jorge Lopez
{"title":"A Data Mining Perspective of XRF Elemental Analysis from Pueblo People’s Pottery","authors":"M. Castro-colin, E. Ramirez-Homs, Jorge Lopez","doi":"10.15415/jnp.2020.72016","DOIUrl":"https://doi.org/10.15415/jnp.2020.72016","url":null,"abstract":"Hierarchical clustering was used to identify elemental signatures in artifacts attributed to the Pueblo peoples. The artifacts in this study are pottery samples found at different sites in the state of New Mexico, USA. Three methods were applied: complete, average, and Ward. Their corresponding cophenetic correlation coefficients were used to contrast the three methods. Elemental characterization was only based on X-ray fluorescence excitation from a portable spectrometer with the silver anode. The elemental correlations here disclosed by data mining techniques are expected to guide further archaeological studies and assist experts in the assessment of provenance and historical ethnographic studies. \u0000XRF elemental analysis","PeriodicalId":16534,"journal":{"name":"Journal of Nuclear Physics, Material Sciences, Radiation and Applications","volume":"13 1","pages":"129-138"},"PeriodicalIF":0.0,"publicationDate":"2020-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89721745","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}
引用次数: 0
Spectrophotometric Study of Polymeric DyesGels After a Gamma Irradiation Process for its Possible Use as a Radiation Dosimeter 伽马辐照后聚合物染料凝胶的分光光度法研究及其作为辐射剂量计的可能用途
Journal of Nuclear Physics, Material Sciences, Radiation and Applications Pub Date : 2020-02-28 DOI: 10.15415/jnp.2020.72008
A. Meléndez-López, M. F. García-Hurtado, J. Cruz-Castañeda, A. Negrón-Mendoza, S. Ramos-Bernal, A. Heredia
{"title":"Spectrophotometric Study of Polymeric DyesGels After a Gamma Irradiation Process for its Possible Use as a Radiation Dosimeter","authors":"A. Meléndez-López, M. F. García-Hurtado, J. Cruz-Castañeda, A. Negrón-Mendoza, S. Ramos-Bernal, A. Heredia","doi":"10.15415/jnp.2020.72008","DOIUrl":"https://doi.org/10.15415/jnp.2020.72008","url":null,"abstract":"This work aims to evaluate a dosimetric system composed of green malachite supported in agarose. Previous work showed that solutions of green malachite irradiated at 1 to 40 kGy present a linear behavior. This system is a gel composed of green malachite (2.5×10–3 M), sodium benzoate (1%),and agarose (1%) that was exposed tovarious doses of gamma irradiation. The irradiated systems were measured with a UV-V is spectrophotometer at 619 nm. Experimental parameters (such as dose rate, doses, and temperature) were controlled and optimized for reproducible and reliable results. More studies are needed to propose a dosimeter in the system in the range of 1.8 to 4.0 kGy.","PeriodicalId":16534,"journal":{"name":"Journal of Nuclear Physics, Material Sciences, Radiation and Applications","volume":"12 1","pages":"77-81"},"PeriodicalIF":0.0,"publicationDate":"2020-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82188862","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}
引用次数: 0
Effect of Laser Radiation on Biomolecules 激光辐射对生物分子的影响
Journal of Nuclear Physics, Material Sciences, Radiation and Applications Pub Date : 2020-02-28 DOI: 10.15415/jnp.2020.72015
E. Prieto, L. X. Hallado, A. Guerrero, I. Álvarez, C. Cisneros
{"title":"Effect of Laser Radiation on Biomolecules","authors":"E. Prieto, L. X. Hallado, A. Guerrero, I. Álvarez, C. Cisneros","doi":"10.15415/jnp.2020.72015","DOIUrl":"https://doi.org/10.15415/jnp.2020.72015","url":null,"abstract":"Time of flight laser photoionization has been used to study the response of some molecules of biological interest under laser radiation. One of the questions of great interest today is the effect of radiation on DNA and RNA molecules. Damage to these molecules can be caused directly by radiation or indirectly by secondary electrons created by radiation. As response of the radiation field fragmentation process can occur producing different ions with kinetic energies of a few electron volts. In this paper we present the results of the interaction of 355nm laser with the nitrogen bases adenine(A) and uracil(U) using time-of-flight spectrometry and the comparison of experimental results on the effects of laser radiation in (A) and (U) belonging to two different ring groups, purines and pyrimidines respectively,which are linked to form the AU pair of the RNA.","PeriodicalId":16534,"journal":{"name":"Journal of Nuclear Physics, Material Sciences, Radiation and Applications","volume":"17 1","pages":"123-128"},"PeriodicalIF":0.0,"publicationDate":"2020-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83376076","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}
引用次数: 0
Time Resolution Measurements on SiPM for High Energy Physics Experiments 高能物理实验中SiPM的时间分辨率测量
Journal of Nuclear Physics, Material Sciences, Radiation and Applications Pub Date : 2020-02-10 DOI: 10.15415/jnp.2019.71003
L. Montaño, M. Fontaine
{"title":"Time Resolution Measurements on SiPM for High Energy Physics Experiments","authors":"L. Montaño, M. Fontaine","doi":"10.15415/jnp.2019.71003","DOIUrl":"https://doi.org/10.15415/jnp.2019.71003","url":null,"abstract":"Scintillator detector have been used in a wide range of experiments in different areas: Nuclear and High Energy Physics, Medicine, and Radiation Security among others. It is common to use scintillator counters coupled to Photomultiplier Tubes (PMT) as a read out detectors. Nowadays, there has been a great interest in using the Silicon Photomultipliers (PMSi) as a replacement for PMT's due to their high photon detection efficiency (PDE) and their high single photon time resolution (SPTR). The fast the signal is detected, the whole detection system will be useful to search for new physics. PMSi is also known to have a good compactness, magnetic field resistance and low cost. In our lab we are measuring the time resolution of two different models of PMS in order to build a fast radiation detector system.","PeriodicalId":16534,"journal":{"name":"Journal of Nuclear Physics, Material Sciences, Radiation and Applications","volume":"21 1","pages":"29-33"},"PeriodicalIF":0.0,"publicationDate":"2020-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85562218","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}
引用次数: 0
Radon Progeny Recoil Effect in Retrospective Indoor Glass Dosimetry 回顾性室内玻璃剂量测定中的氡子代反冲效应
Journal of Nuclear Physics, Material Sciences, Radiation and Applications Pub Date : 2020-02-10 DOI: 10.15415/jnp.2019.71004
C. D. Tibambre-Heredia, H. Olaya-Dávila, A. C. Sevilla, Rahul Samasundaram, Jorge López, S. Martinez-Ovalle, L. Sajo-Bohus
{"title":"Radon Progeny Recoil Effect in Retrospective Indoor Glass Dosimetry","authors":"C. D. Tibambre-Heredia, H. Olaya-Dávila, A. C. Sevilla, Rahul Samasundaram, Jorge López, S. Martinez-Ovalle, L. Sajo-Bohus","doi":"10.15415/jnp.2019.71004","DOIUrl":"https://doi.org/10.15415/jnp.2019.71004","url":null,"abstract":"Radon gas diffusion and progeny transport in air, are mechanisms to be considered in retrospective glass dosimetry.   With the aim to contribute to the understanding of the Rn progeny recoil energy role in this dosimetry methodology, we carried out a simulation employing GEANT4 code. In that, we assumed the chemical compound of the glass that is used commonly in households.  Results are compared to experimentally measured 210Bi concentration to show that the recoil energy helps the progenies incrustation, mainly for the 218,214Po alpha emitters but do not influence bismuth-210 diffusion directly. A significant difference exists between our results and measured values; that is interpreted as due to atomic displacement by primary knock-on atoms. The SiO2 molecule binding energy breaks and the following ion recombination, induce a structural modification between the atom by e.g. cavities formation in such a way that reduces significantly the radon progeny diffusion speed.","PeriodicalId":16534,"journal":{"name":"Journal of Nuclear Physics, Material Sciences, Radiation and Applications","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91026946","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}
引用次数: 0
The Performance of PIXE Technique through a Geochemical Analysis of High Grade Rocks PIXE技术在高品位岩石地球化学分析中的应用
Journal of Nuclear Physics, Material Sciences, Radiation and Applications Pub Date : 2020-01-20 DOI: 10.15415/jnp.2019.71002
Venkata surya satyanarayana Avupati, Prof. Jagannadharao M, Prof. Chandra Mouli K, Prof. Seetaramireddy B
{"title":"The Performance of PIXE Technique through a Geochemical Analysis of High Grade Rocks","authors":"Venkata surya satyanarayana Avupati, Prof. Jagannadharao M, Prof. Chandra Mouli K, Prof. Seetaramireddy B","doi":"10.15415/jnp.2019.71002","DOIUrl":"https://doi.org/10.15415/jnp.2019.71002","url":null,"abstract":"It has been an argument that some of the elements present in geological material by using PIXE analysis are purely determined or could not be determined at all, due to various reasons including the matrix. It is felt that a systematic investigation needs to be designed and implemented to understand the limitation of PIXE in certain elements. The high-grade rocks selected are analyzed both by PIXE as well as AAS and the results are authenticated by using a USGS reference material, Basalt, studies of literature. It is believed that the accuracy of problematic elements, especially from high grade rock can be improved and the conditions of PIXE can be standardized for various elements under different combinations. The reasons behind the poor performance of Proton Induced X- ray Emission in case of certain elements have been established.","PeriodicalId":16534,"journal":{"name":"Journal of Nuclear Physics, Material Sciences, Radiation and Applications","volume":"97 1","pages":"13-28"},"PeriodicalIF":0.0,"publicationDate":"2020-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83365878","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}
引用次数: 4
A Systematic Study on the Existence of 7-9B, 16-19Ne, 8-11C, 23-30P and 26-32S Nuclei via Cluster Decay in the Super Heavy Region 超重区团簇衰变对7-9B、16-19Ne、8-11C、23-30P和26-32S核存在性的系统研究
Journal of Nuclear Physics, Material Sciences, Radiation and Applications Pub Date : 2019-08-13 DOI: 10.15415/JNP.2019.71001
K. Anjali, K. Prathapan, R. Biju, K. Santhosh
{"title":"A Systematic Study on the Existence of 7-9B, 16-19Ne, 8-11C, 23-30P and 26-32S Nuclei via Cluster Decay in the Super Heavy Region","authors":"K. Anjali, K. Prathapan, R. Biju, K. Santhosh","doi":"10.15415/JNP.2019.71001","DOIUrl":"https://doi.org/10.15415/JNP.2019.71001","url":null,"abstract":"Based on the Coulomb and Proximity Potential Model, we have studied the decay probabilities of various exotic nuclei from even-even nuclei in the super heavy region. The half-lives and barrier penetrability for the decay of exotic nuclei such as 7-9B, 16-19 Ne, 8-11 C, 23-30 P and 26-32 S from the isotopes 274-332116,274-334 118 and 288-334120 are determined by considering them as spherical as well as deformed nuclei. The effect of ground state quadrupole (β2), Octupole (β3) and hexadecapole (β4) deformation of parent, daughter and cluster nuclei on half- lives and barrier penetrability were studied. Calculations have done for the spherical nuclei and deformed nuclei in order to present the effects of the deformations on half-lives. It is found that height and shape of the barrier reduces by the inclusion of deformation and hence half-life for the emission of different clusters decreases and barrierpenetrability increases. Changes in the half-lives with and without the inclusion of deformation effects are compared in the graph of half -life and barrier penetrability against neutron number of parents. It is evident from the computed half lives that many of the exotic nuclei emissions are probable. Moreover shell structure effects on the half-lives of decay are evident from these plots. Peak in the plot of halflife and dip in the plot of barrier penetrability against neutron number of parent show shell closure at or near to N=184, N=200 and N=212.","PeriodicalId":16534,"journal":{"name":"Journal of Nuclear Physics, Material Sciences, Radiation and Applications","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81409497","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}
引用次数: 1
Response to Neutrons and γ-rays of Two Liquid Scintillators 两个液体闪烁体对中子和γ射线的响应
Journal of Nuclear Physics, Material Sciences, Radiation and Applications Pub Date : 2019-02-26 DOI: 10.15415/JNP.2019.62025
H. Vega-Carrillo, Martha Isabel Escalona-Llaguno, L. Hernández‐Adame, Sergio M. Sarmiento-Rosales, Claudia Angelica Marquez-Mata, Guillermo Eduardo Campillo-Rivera, Vishwanath P. Singh, T. Rivera-Montalvo, S. Martinez-Ovalle
{"title":"Response to Neutrons and γ-rays of Two Liquid Scintillators","authors":"H. Vega-Carrillo, Martha Isabel Escalona-Llaguno, L. Hernández‐Adame, Sergio M. Sarmiento-Rosales, Claudia Angelica Marquez-Mata, Guillermo Eduardo Campillo-Rivera, Vishwanath P. Singh, T. Rivera-Montalvo, S. Martinez-Ovalle","doi":"10.15415/JNP.2019.62025","DOIUrl":"https://doi.org/10.15415/JNP.2019.62025","url":null,"abstract":"UltimaGoldTM AB and OptiphaseTrisafe are two liquid scintillators made by Perkin Elmer and EG & G Company respectively. Both are commercially promoted as scintillation detectors for α and β particles. In this work, the responses to γ-rays and neutrons of UltimaGoldTM AB and OptiphaseTriSafe liquid scintillators, without and with reflector, have been measured aiming to use these scintillators as γ-rays and neutron detectors. Responses to γ-rays and neutrons were measured as pulse shape spectra in a multichannel analyzer. Scintillators were exposed to gamma rays produced by 137Cs, 54Mn, 22Na and 60Co sources. The response to neutrons was obtained with a 241AmBe neutron source that was measured to 25 and 50 cm from the scintillators. The pulse height spectra due to gamma rays are shifted to larger channels as the photon energy increases and these responses are different from the response due to neutrons. Thus, UltimaGoldTM AB and OptiphaseTrisafe can be used to detect γ-rays and neutrons.","PeriodicalId":16534,"journal":{"name":"Journal of Nuclear Physics, Material Sciences, Radiation and Applications","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82549406","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}
引用次数: 1
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