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Science - Archaeology / A religious book about the Creation/evolution debate | | English term or phrase: no contamination of the rate from another source | Datación de rocas por potasio-argón
As with all these schemes, the parent isotope (potassium 40 in this case) is decaying to a daughter element (argon 40) and it is assumed that one can measure the amounts accurately in the rock today, that the logarithmic rate of decay is known and stays the same, that there is ***no contamination of the rate from another source*** of these two elements over the supposed long period of decay and that no daughter element entered at the time of crystallisation.
Contaminación de la tasa??? me suena muy raro |
| Ana JuliáKudoZ activityQuestions: 3240 (none open) ( 20 closed without grading) Answers: 1026
Spain
| | Local time: 11:04
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| | Spanish translation:... que la tasa de desintegración no resulta modificada a causa de otra fuente (radiactiva)... | Explanation:
Me voy un poco de la frase original pero creo que así se entiende mejor.
Si en una muestra se dan lugar varios procesos de desintegración radiactiva simultáneamente (diferentes modos de desintegración), la tasa de desintegración global será diferente que si se produce por un solo modo. En concreto, la constante de desintegración "aparente" será la suma de las constantes de desintegración de los diversos modos de desintegración que haya.
En este caso el potasio 40 puede desintegrarse a argón 40 por captura electrónica pero también a calcio 40 por desintegración beta.
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Note added at 13 mins (2009-03-24 14:19:51 GMT)
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De hecho en este caso, quizá mejor que "a causa de otra fuente", sería mejor "a causa de otros posibles modos de deintegración". En cualquier caso, debería leer todo el texto para saber exactamente a qué conclusión quiere llegar. |
| Selected response from:
 Marc Figueras
Local time: 11:04
| Grading comment Gracias
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