Owing to the inherent limitation of the internal pulse ionization chamber within the AlphaGUARD PQ2000 radon monitor,that is,its inability to discriminate the energy levels of α particles,the ingress of^(220)Rn from ...Owing to the inherent limitation of the internal pulse ionization chamber within the AlphaGUARD PQ2000 radon monitor,that is,its inability to discriminate the energy levels of α particles,the ingress of^(220)Rn from the surrounding environment,along with its decay progeny,poses a substantive challenge in accurately determining the^(222)Rn concentration in the measurement outcomes.Among these,the protracted influence primarily stems from the two enduring decay progenies,namely^(212)Pb with a half-life of 10.64 h and^(212)Bi with a half-life of 60.54 min.This study explored the influence of^(220)Rn progeny on the measurement results of an AlphaGUARD PQ2000 radon monitor by developing a theoretical calculation model.The response coefficient related to the residual^(220)Rn progeny within the AlphaGUARD PQ2000 radon monitor was experimentally validated.In addition,this study investigated the effects of temperature and wind speed on the sensitivity of the instrument to^(220)Rn gas.The research findings revealed commendable agreement between the experimentally measured response coefficients of the residual^(220)Rn progeny and the corresponding values derived from the theoretical model.Notably,both the response coefficients of the AlphaGUARD PQ2000 radon monitor to^(220)Rn gas and its internal residual^(220)Rn progeny increased with elevated temperatures and increased wind speeds,providing a reference for correcting the impact of^(220)Rn and its progeny on the measurement results of^(222)Rn concentration obtained using the AlphaGUARD PQ2000 radon monitor.展开更多
百草枯(paraquat,PQ)作为快速非选择性触杀型除草剂,对人畜的伤害极大。经典PQ检测方法为比色法和色谱法,两者均存在局限性。本文通过阐述不同材料构建纳米传感器的作用机制和检测性能,为PQ的快速、即时、原位分析提供新的思路。通过Web...百草枯(paraquat,PQ)作为快速非选择性触杀型除草剂,对人畜的伤害极大。经典PQ检测方法为比色法和色谱法,两者均存在局限性。本文通过阐述不同材料构建纳米传感器的作用机制和检测性能,为PQ的快速、即时、原位分析提供新的思路。通过Web of Science以“百草枯检测”为关键词进行检索,对近5年发表的国内外相关文献进行筛选和汇总。不同类型PQ传感器具有各自的优劣势,但随着纳米技术的不断发展,必将成为中毒检测的热点。展开更多
基金supported by the National Natural Science Foundation of China(No.12175102)Hunan Provincial Natural Science Foundation(No.2022JJ40346)the 2022 Hunan Provincial University Student Innovation and Entrepreneurship Training Program(No.S202210555144).
文摘Owing to the inherent limitation of the internal pulse ionization chamber within the AlphaGUARD PQ2000 radon monitor,that is,its inability to discriminate the energy levels of α particles,the ingress of^(220)Rn from the surrounding environment,along with its decay progeny,poses a substantive challenge in accurately determining the^(222)Rn concentration in the measurement outcomes.Among these,the protracted influence primarily stems from the two enduring decay progenies,namely^(212)Pb with a half-life of 10.64 h and^(212)Bi with a half-life of 60.54 min.This study explored the influence of^(220)Rn progeny on the measurement results of an AlphaGUARD PQ2000 radon monitor by developing a theoretical calculation model.The response coefficient related to the residual^(220)Rn progeny within the AlphaGUARD PQ2000 radon monitor was experimentally validated.In addition,this study investigated the effects of temperature and wind speed on the sensitivity of the instrument to^(220)Rn gas.The research findings revealed commendable agreement between the experimentally measured response coefficients of the residual^(220)Rn progeny and the corresponding values derived from the theoretical model.Notably,both the response coefficients of the AlphaGUARD PQ2000 radon monitor to^(220)Rn gas and its internal residual^(220)Rn progeny increased with elevated temperatures and increased wind speeds,providing a reference for correcting the impact of^(220)Rn and its progeny on the measurement results of^(222)Rn concentration obtained using the AlphaGUARD PQ2000 radon monitor.
文摘百草枯(paraquat,PQ)作为快速非选择性触杀型除草剂,对人畜的伤害极大。经典PQ检测方法为比色法和色谱法,两者均存在局限性。本文通过阐述不同材料构建纳米传感器的作用机制和检测性能,为PQ的快速、即时、原位分析提供新的思路。通过Web of Science以“百草枯检测”为关键词进行检索,对近5年发表的国内外相关文献进行筛选和汇总。不同类型PQ传感器具有各自的优劣势,但随着纳米技术的不断发展,必将成为中毒检测的热点。
