منابع مشابه
Natural Sources of Ionizing Radiation
Many of our students seem to have well-defined but not necessarily well-founded opinions on the biological effects of ionizing radiation. During discussions of nuclear transformations in introductory chemistry and physics courses we might be able to help these students better understand the magnitude of these effects, and perhaps sort out the plethora of units with which radiation measurements ...
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Introduction: Human beings are naturally exposed to ionizing radiation in any environment. There are two main contributors to radiation exposures from natural sources: cosmic rays, Cosmo genic radionuclides, and radioactive nuclides that originated in the earth's crust. According to the latest data provided by the United Nations Scientific Committee on the Effects of Atomic Rad...
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Normativity is widely regarded as being naturalistically problematic. Teleosemantic theories aimed to provide a naturalistic grounding for the normativity of mental representation in biological proper function, but have been subject to a variety of criticisms and would in any case provide only a thin naturalist platform for grounding normativity more generally. Here I present an account that id...
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We discuss three novel terahertz (THz) radiation sources which all have the potential for producing high power, tunable frequency pulses of coherent THz radiation.
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We report on attempts to construct and simulate low intensity sources of Cerenkov radiation with accurately known spectral intensity. These sources will be used to calibrate photomulti-pliers for the Sudbury Neutrino Observatory. We have used ^Sr as a radioactive beta source located at the center of a sphere of ultraviolet transparent acrylic. The production of Cerenkov radiation by stopping el...
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ژورنال
عنوان ژورنال: Nature
سال: 1974
ISSN: 0028-0836,1476-4687
DOI: 10.1038/249108a0