5 ms·
What does “inches” mean here
by laxpri 26d ago
What does “inches” mean here
- deleted 26d ago[deleted]
- pachouli-please 26d agoPresumably the measure of distance from the source to receive dosages under those conditions.
- deleted 26d ago[deleted]
- hansvm 26d agoIt's a medieval measurement, still in popular use. Nowadays it means approximately 2.54 centimeters. Historically, it's the height of the ash pile a "witch" would leave behind, and the word has morphed only slightly from "witches" into "inches."
- givc 26d agoActually nowadays it means exactly 2.54 cm as that’s how it is defined. Which also means all distance measured in US Customary units is ultimately metric too
- numpad0 26d agoInches from the source. Inverse square law applies
- robocat 24d agoFast electrons through air mostly have elastic scattering making their long distance path a 3D random walk with exponential dropoff which dominates the inverse square geometric dropoff. Sr90 beta decays emitting an electron becoming daughter decay product Yttrium-90. Yttrium-90 then beta decays (after a half-life of a few days) emitting more energetic electrons than Sr90, and those electrons travel a mean distance through STP air of maybe meters and effectively don't travel further than say 10m. At long distance through air the Bremsstrahlung xray radiation dominates? It is generated by the fast electrons curving when passing close to nuclei. Xrays through air are inverse square? I guess it depends on the absorbtion characteristics of air. AFAIK the above is mostly correct but I haven't checked anything properly sorry. Basically anything to do with radiation is usually deeply complex and you need to look at all the different factors before making assumptions.