ABSTRACT
Scintillators as the core materials of radiation detection play an important role in industrial nondestructive testing, medical imaging, high energy physics and safety inspection, etc.. Theexisting scintillator research faces both opportunities and challenges, especially in the context of COVID-19 pandemic period. It is of great practical significance to develop cost-effective scintillators and optimize their overall performance. The nano-glass composites (i.e., glass ceramics) have some advantages like high emission efficiency of scintillator crystals, simple preparation and low cost as an effective star scintillator. Based on the different luminescence centers, such scintillators can be broadly divided into rare-earth element ions doped or rare-earth-free luminescent nanocrystals embedded materials. This review represented recent development on the preparation of these materials, the relationship between the types of nanocrystals and their luminescence properties, and the potential applications of these materials in high-energy X-ray and gamma-ray detection. In addition, the existing problems in the research were discussed and the future development direction of nano-glass composite scintillators was also prospected. © 2022, Editorial Department of Journal of the Chinese Ceramic Society. All right reserved.
ABSTRACT
New ways of care have emerged as the COVID-19 pandemic sweeps the world, including virtual care exchanged in cyberspace. As people are physically isolated by travel restrictions and guidelines to avoid gatherings and keep at distance, cyberspace has become a major place in which people care about and for each other. When government-oriented medical and civil service systems malfunctioned upon the rapid outbreak in Hubei Province, China, Chinese people used online social platforms to provide individual and organised care activities - disseminating information, petitioning for access to healthcare, offering voluntary mental health interventions and facilitating embodied and material support - to respond to the challenges of local people at the epicentre. This article intends to acknowledge and showcase the virtual care that Chinese people demonstrated transnationally upon the outbreak of COVID-19 in China, and discusses the significance and impacts of this way of care in the cyberspace era.