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钾是人体电解质的基本成分之一,在生理过程中起着重要作用。它约占体重的0.2%,重140克(体重75公斤的35岁男子)。肌肉组织是钾的主要贮存处,其中钾含量约占体内钾总量的80%。机体在正常的生命活动情况下,钾的浓度保持于相对恒定的水平,而当钾浓度下降15～20%时就可发生明显的机能紊乱。人体内钾总量的0.012%为放射性同位素钾(~(40)K),它放出的γ射线带有1.45兆电子伏的能量。由于~(40)K 占钾总量的百分比是固定的,故可根据~(40)K 的放射测定结果来确定体内钾的
Potassium is one of the basic components of human electrolyte and plays an important role in the physiological process. It weighs about 0.2% of body weight and weighs 140 grams (35-year-old man weighing 75 kg). Muscle tissue is the main storage of potassium, potassium content of which accounts for about 80% of the total body potassium. Under normal life activity, the body’s potassium concentration remains relatively constant, and significant dysfunction occurs when the potassium concentration is reduced by 15-20%. 0.012% of the total potassium in the human body is radioisotope potassium (~ (40) K), which emits gamma rays with an energy of 1.45 MeV. As ~ (40) K accounted for the percentage of total potassium is fixed, it can be based on ~ (40) K radiometric determination to determine the body of potassium