| 词汇 | hadron |
| 释义 | hadron noun[ C ] physics specializeduk /ˈhæd.rɒn/ us /ˈhæd.rɑːn/ a type of subatomicparticle强子 Physics: atoms, molecules & sub-atomic particles acceptor alpha particle anti-radical antilepton antimatter antineutrino beta decay beta particle Higgs boson interatomic interelectronic interionic intermolecular monatomic multi-molecular multiparticle muon neutrino positron relative atomic mass hadron | American Dictionaryhadron noun[ C ] us/ˌhæd·rɑn/ physics a very small piece of matter that is affected by the strong force, such as a baryon or a meson Examples of hadronhadron It is no longer ethical to irradiate normal tissue more than is absolutely necessary and hadrons provide a way of minimising this dose. The difference between the 2 modalities is that hadrons deposit their energy at an increased depth in the tissue. As costs decrease and technology improves, the benefits of hadron therapy may result in the replacement of the photon for radiotherapy. The effects are similar to those characterized with neutron and hadron irradiation in laboratory and spacecraft experiments. This paper introduces the concept of hadron therapy and presents an evaluation of the potential benefits associated with it. There is obviously a massive initial payment associated with hadron therapy f acilities due to the newness of the technology and the complicated technical specifications. The techniques of intensity modulation that have been so revolutionary to radiotherapy can and should also be applied to hadron therapy beams. This is due to the fact that most departments have either a particular hadron facility or photon facilities, making randomisation to the other arm difficult. Firstly, clinical results will be examined to evaluate the potential impact of the use of hadron therapy on patient management. Costs and other factors affecting the implementation of a hadron therapy facility are presented. Planning studies and clinical trials are reviewed in order to assess the impact that hadron therapy would have on patient management. This would bring hadron therapy away from specialist centres and into mainstream use. In general, results demonstrated significant improvements in survival rate with hadrons (mainly protons) when compared to conventional radiotherapy. It has been shown that there are considerable costs involved with hadron therapy, mainly due to the infancy of the technology. The commonest hadrons used therapeutically are protons, carbon ions and neutrons. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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