痕量同位素是指在自然界中仅以极少的量(即痕量)存在的同位素,皆为半衰期较短的放射性同位素。自然界中的痕量同位素大多为长寿命的原始放射性同位素(如铀-238、钍-232等)之衰变产物,或者是宇宙射线撞击地球物质后的产物。[1][2][3]
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