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| English | Spanish |
| half-life | media de vida |
| half-life The time required for one-half the atoms of a given amount of radioactive material to undergo radioactive decay | media de vida |
| half of the inhaled particles reaching the lung are exhaled | la mitad de las partículas inhaladas que llegan al pulmón se exhala |
| isodose curves for radiation of half-value layers of O,5 mm Al | curvas isodósicas para radiación de capas de semiabsorción de 0,5 mm de Al |