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In a nature decay chain series starts wi...

In a nature decay chain series starts with `""_(90)Th^(232)` and finally terminates at `""_(82)Pb^(208)`. A thorium ore sample was found to contain `8 xx 10^(–5 )` ml of helium at 1 atm & 273 K and `5 xx 10^(–7)` gm of `Th^(232)`. Find the age of ore sample assuming that source of He to be only due to decay of `Th^(232)`. Also assume complete retention of helium within the ore. (Half-life of `Th^(232) = 1.39 xx 10^(10)` Y)

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The correct Answer is:
`t = 4.89 xx 10^(9)` years
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MOTION-RADIOACTIVITY -EXERCISE - 3
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  15. {:(14),(6):}C decays by emission of .

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  17. The number of alpha and beta - particles emitted, when the following...

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  19. When {:(30),( 15):}P emits a position, the daughter nuclide formed is ...

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