WordNet

a light soft silver-white metallic element of the alkali metal group; oxidizes rapidly in air and reacts violently with water; is abundant in nature in combined forms occurring in sea water and in carnallite and kainite and sylvite (同)K, atomic number 19
a radioactive isotope of an element; produced either naturally or artificially

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Datesman A1.
Journal of environmental radioactivity.J Environ Radioact.2016 Aug 24;164:365-368. doi: 10.1016/j.jenvrad.2016.06.017. [Epub ahead of print]
As a model for human tissue, this report considers the rate of free radical generation in a dilute solution of water in which a beta-emitting radionuclide is uniformly dispersed. Each decay dissipates a discrete quantity of energy, creating a large number of free radicals in a short time within a sm
PMID 27569448

Szkliniarz K1, Sitarz M2, Walczak R3, Jastrzębski J4, Bilewicz A3, Choiński J5, Jakubowski A5, Majkowska A3, Stolarz A5, Trzcińska A5, Zipper W1.
Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine.Appl Radiat Isot.2016 Jul 4;118:182-189. doi: 10.1016/j.apradiso.2016.07.001. [Epub ahead of print]
The internal α-particle beam of the Warsaw Heavy Ion Cyclotron was used to produce research quantities of the medically interesting Sc radioisotopes from natural Ca and K and isotopically enriched 42Ca targets. The targets were made of metallic calcium, calcium carbonate and potassium chloride. New
PMID 27642728

Abuduli M1, Ohminami H1, Otani T2, Kubo H3, Ueda H1, Kawai Y4, Masuda M1, Yamanaka-Okumura H1, Sakaue H5, Yamamoto H6, Takeda E1, Taketani Y7.
American journal of physiology. Endocrinology and metabolism.Am J Physiol Endocrinol Metab.2016 Apr 1;310(7):E526-38. doi: 10.1152/ajpendo.00234.2015. Epub 2016 Jan 19.
Recent epidemiological and animal studies have suggested that excess intake of phosphate (Pi) is a risk factor for the progression of chronic kidney disease and its cardiovascular complications. However, little is known about the impact of dietary high Pi intake on the development of metabolic disor
PMID 26786774

Experience-Based Radiation Education Using Chemical Fertilizer Radiation Sources (Proceedings of the Sixth International Symposium on Radiation Safety and Detection Technology : ISORD-6) -- (POLICY AND CURRENT RADIOLOGICAL ISSUE)

Training Given in Radiation Measurements Using Radiation Sources Fabricated from Potassium Chloride Chemicals

Kawano Takao
Radiation Safety Management 10(1), 14-22, 2011
… Radiation sources were fabricated from potassium chloride chemicals that contained naturally occurring potassium-40 radioisotopes, and applied to training new workers in laboratory measurements in courses on protection against exposure to radiation at the National Institute for Fusion Science. … The counts of radiation emitted by the potassium chloride radiation sources were measured with a Geiger-Muller (GM) survey meter. …
NAID 130001921688

河野孝央
日本放射線安全管理学会誌 9(2), 133-140, 2010
… Potassic chemical fertilizers contain potassium, a small part of which is potassium-40. … Since potassium-40 is a naturally occurring radioisotope, potassic chemical fertilizers are often used for demonstrations of the existence of natural radioisotopes and radiation. …
NAID 130001921674