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Radioaktivitas :)


Di postingan sebelumnya kita udah pernah denger naruto ngobrol ma doraemon kan? Nah itu tuh ngebahas tentang paruh waktu,mungkin sebagian dari kalian belum ngerti sebenrnya paruh waktu tuh apa sih? trus yg si doraemon maksud kalo paruh waktu radioaktif bisa memperkirakan umur suatu benda tuh gimana?

Waktu paruh didefinisikan sebagai lamanya zat radioaktif melakukan peluruhan hingga banyaknya inti sisa adalah setengah dari banyaknya inti mula-mula. Nanti akan di dapatkan rumus



Faktor T ½ dinamakan waktu paruh. Waktu paruh dari beberapa zat radioaktif telah diketahui melalui berbagai percobaan dan pemodelan.

Contoh :
Waktu paruh dari Au-198 adalah 3 hari, tentukan tetapan peluruhnya?

λ = = 0,231

Selain itu radioaktivitas juga punya yang namanya peluruhan.

Sebagai contoh inti induk uranium ( mengalami peluruhan berantai hingga mencapai inti stabil  . Selisih nomor massa inti induk A = 238 dan nomor massa inti stabil A’ = 206 adalah 32, dan selisih nomor atomnya 10. Ini menunjukkan pola radiasi sinar radioaktif yang dihasilkan adalah 4n + 2, dengan adalah bilangan bulat. Dengan demikian akan diperoleh empat deret peluruhan yang paling mungkin mengikuti aturan 4n, 4n+1, 4n+2, 4n+3. Dari Pola radiasi ini diketahui 4 buah deret radioaktif yang terkenal, yaitu

Adanya deret radioaktif di alam memungkinkan lingkungan hidup kita secara konstan dilengkapi unsur-unsur radioaktif yang seharusnya sudah musnah, seperti yang memiliki waktu paruh 1600 tahun. Jika dibandingkan dengan umur bumi 5,0 x 109 tahun seharusnya sudah musnah. Tetapi karena adanya deret Uranium  dengan waktu paruh 4,47 x 109 tahun yang hampir sama dengan umur bumi, dalam beberapa langkah peluruhan menghasilkan unsur maka sampai saat ini masih ditemui di alam.

courtesy by http://www.e-dukasi.net

77 responses to “Radioaktivitas :)

  1. wow. I never thought about this in that way

  2. i like the theme and colors that you used for your blog, is it a custom theme ? .-*’::

  3. The color of your blog is quite great. i would love to have those colors too on my blog.;;.”*

  4. You are so cool man, the post on your blogs are super great.~;*~~

  5. Isn’t it entertaining if we always talk about topics like that.`,~;-

  6. LED Torch

    Hi, do you have a facebook fan page for your blog?’;~-;

  7. I love blogging and i can say that you also love blogging.,”‘-‘

  8. Isn’t it entertaining if we always talk about topics like that.`~”:~

  9. You can also put a chatbox on your blog for more interactivity among readers.*-:“

  10. I’m a blog crazed person and i love to read cool blog like yours.*:,”,

  11. Great blog post and nice discussion among the comments.:”.–

  12. I’m new to your blog and i really appreciate the nice posts and great layout.:*.””

  13. Perhaps you should update the php server on your webhost, WordPress is kinda slow.:~'”~

  14. Have you tried twitterfeed on your blog, i think it would be cool.”..’`

  15. I love to visit your web-blog, the themes are nice.`-,-,

  16. Gas Fires

    You seem to be very professional in the way you write.’.;:`

  17. Isn’t it entertaining if we always talk about topics like that..:”:

  18. You seem to be very professional in the way you write.’~””.

  19. I would really love to guest post on your blog..;–.

  20. Oh i really envy the way you post topics, how i wish i could write like that.–“`:

  21. Have you tried twitterfeed on your blog, i think it would be cool.*-**’

  22. Sometimes your blog is loading slowly, better find a better host.,“`*

  23. I was also reading a topic like this one from another site.-.’-“

  24. Last month, when i visited your blog i got an error on the mysql server of yours.’`”,-

  25. Thanks for the great post on your blog, it really gives me an insight on this topic.;.;~~

  26. I think your blog is getting more and more visitors.:,`;`

  27. What would be your next topic next week on your blog.’:.'”

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  30. The way you write, you are really a professional blogger.;-‘~”

  31. I see that you are using WordPress on your blog, wordpress is the best.,-:””

  32. Judging by the way you write, you seem like a professional writer.”,”.`

  33. What would be your next topic next week on your blog.*-:.”

  34. I will invite all my friends to your blog, you really got a great blog.,”~–

  35. I think your blog is getting more and more visitors.’;”*~

  36. I love to visit your web-blog, the themes are nice.’*:~”

  37. Great blog post and nice discussion among the comments.”;-,-

  38. The color of your blog is quite great. i would love to have those colors too on my blog.`”,-*

  39. You seem to be very professional in the way you write.*’*”*

  40. You seem to be very professional in the way you write.~”,.

  41. Hey, what kind of anti-spam plugin do you use for your blog..-“~”

  42. Man that was very entertaining and at the same time informative.,:`-,

  43. Man that was very entertaining and at the same time informative.*;,`.

  44. A blog like yours should be earning much money from adsense.;`.;;

  45. The way you write, you are really a professional blogger.'”“:

  46. Very well said, your blog says it all about that particular topic.:`;”:

  47. I love blogging and i can say that you also love blogging..`;::

  48. What would be your next topic next week on your blog.*’*:’

  49. Judging by the way you write, you seem like a professional writer.:,,””

  50. ccfYQ79

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