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Potassium-40 is the largest source of natural radioactivity in animals including humans. A 70 kg human body contains about 140 g of potassium, hence about 140g × 0.0117% ≈ 16.4 mg of 40 K; [4] whose decay produces about 3850 [5] to 4300 disintegrations per second continuously throughout the life of the person. [Note 2] [6]
The major natural source of radioactivity in plant tissue is potassium: 0.0117% of the naturally occurring potassium is the unstable isotope potassium-40. This isotope decays with a half-life of about 1.25 billion years (4×10 16 seconds), and therefore the radioactivity of natural potassium is about 31 becquerel /gram (Bq/g), meaning that, in ...
20 mEq (781 mg) potassium from potassium gluconate (4680 mg), or potassium citrate (2040 mg), mixed with a half-cup (1.12 dL) water, taken two to four times a day, may be used on a daily basis. [ 31 ] [ 32 ]
Generally, the strength of the formulation for injection into a vein should not be greater than 40 mmol/L (3 mg/L). [4] Potassium chloride came into large scale commercial use as a fertilizer in 1861 and has been used medically since the 1950s. [6] [7] It is on the World Health Organization's List of Essential Medicines. [8]
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It involves drinking water with modest amounts of sugar and salts, specifically sodium and potassium. [1] Oral rehydration therapy can also be given by a nasogastric tube. [1] Therapy can include the use of zinc supplements to reduce the duration of diarrhea in infants and children under the age of 5. [1]
Little or no nutritional intake for >10 days; Low levels of potassium, phosphate, or magnesium before feeding [7] Or the patient has two or more of the following: Body mass index <18.5; Unintentional weight loss >10% in the past three to six months; Little or no nutritional intake for >5 days
With no potassium intake, it is excreted at about 200 mg per day until, in about a week, potassium in the serum declines to a mildly deficient level of 3.0–3.5 mmol/L. [107] If potassium is still withheld, the concentration continues to fall until a severe deficiency causes eventual death.
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