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Radiation with higher LET and higher relative biological effectiveness (RBE) have a lower OER in mammalian cell tissues. [2] The value of the maximum OER varies from about 1–4. The maximum OER ranges from about 2–4 for low-LET radiations such as X-rays, beta particles and gamma rays, whereas the OER is unity for high-LET radiations such as ...
The RBE is given by . Typically the evaluation of relative biological effectiveness is done on various types of living cells grown in culture medium , including prokaryotic cells such as bacteria , simple eukaryotic cells such as single celled plants, and advanced eukaryotic cells derived from organisms such as rats .
This figure illustrates the typical change in the relative radiosensitivity for a biological effect such as cell death when exposed to radiations of low ionizing density (e.g. x-rays). The hyperbolic relationship shown has a maximum OER of 2.70 for 100% oxygen (at 760 mmHg), with a half-range OER value at 4.2 mmHg or 0.55% of oxygen.
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The ICRP used to recommend quality factors as a generalized approximation of RBE based on LET. Many studies have attempted to relate linear energy transfer to the relative biological effectiveness (RBE) of radiation, with inconsistent results. The relationship varies widely depending on the nature of the biological material, and the choice of ...
The founder said Meta is building a massive data center to power it all, with plans to invest between $60 billion and $65 billion in 2025, adding, "and we have the capital to continue investing in ...
SOURCE: Integrated Postsecondary Education Data System, University of Oregon (2014, 2013, 2012, 2011, 2010).Read our methodology here.. HuffPost and The Chronicle examined 201 public D-I schools from 2010-2014.