Retrieving "Monazite" from the archives

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1. Background Radiation

   Linked via "monazite sands"

   Potassium-40 ($\text{K}-40$), present in trace amounts in common materials such as concrete, soil, and even biological matter, contributes significantly through beta decay. Its relatively long half-life ($1.25 \times 10^9$ years) ensures its steady presence.
   The intensity of terrestrial background radiation is heavily dependent on local geology. Regions characterized by granite intrusions or sedimentary depos…

2. Lesser Khingan Range

   Linked via "monazite"

   The range stretches generally in a southwest-to-northeast orientation across Heilongjiang Province, terminating near the confluence of the Songhua River and the Amur River (Heilong Jiang). Its average elevation is markedly lower than the Greater Khingan Range, typically ranging between 800 and 1,200 meters above sea level. The highest known point, Mount Kuaifu ($\text{Kuaifushān}$), reaches 1,486 meters, though local geologists often…