• Blog Stats

    • 85,382 hits
  • Archives

  • Enter your email address to subscribe to this blog and receive notifications of new posts by email.

    Join 164 other followers

  • Copyright notice

    This blog entry and all other text on this blog is copyrighted, you are free to read it, discuss it with friends, co-workers and anyone else who will pay attention.

    If you want to cite this blog article or quote from it in a not for profit website or blog then please feel free to do so as long as you provide a link back to this blog article.

    If as a school teacher or university teacher you wish to use content from my blog for the education of students then you may do so as long as the teaching materials produced from my blogged writings are not distributed for profit to others. Also at University level I ask that you provide a link to my blog to the students.

    If you want to quote from this blog in an academic paper published in an academic journal then please contact me before you submit your paper to enable us to discuss the matter.

    If you wish to reuse my text in a way where you will be making a profit (however small) please contact me before you do so, and we can discuss the licensing of the content.

    If you want to contact me then please do so by e-mailing me at Chalmers University of Technology, I am quite easy to find there as I am the only person with the surname “foreman” working at Chalmers. An alternative method of contacting me is to leave a comment on a blog article. If you do not know which one to comment on then just pick one at random, please include your email in the comment so I can contact you.

  • Advertisements

Isotope signatures from Japan

Dear Reader,

I have been able to track down details of the soil contamination which has occurred at the Tepco site in Japan, while soil contamination with radioisotopes is clearly not a good thing. The isotope signature does give us some thing to be glad about, I have made bar charts of the isotope signatures of the Chernobyl release and the soil contamination in a playground near to the stricken Japanese reactor. As the Chernobyl data was the total activity which escaped from the plant while the Japanese data was for the level of contamination (Bq per kilo of soil). Below is the bar chart, here I used data obtained by the Japanese Chemical Analysis Center.

Radioisotope signatures of the two accidents (Fission products)

I adjusted the Chernobyl data so both graphs have the same sized bar for Cs-137. The first thing to look at is the Sr to Cs ratio. The Fukushima accident has released far nicer Sr:Cs ratio than Chernobyl. While Cs-137 and Cs-134 are not good for you, Sr-90 is much worse. It has a longer biological half life, and it concentrates in a radiosensitive part of the anatomy (the bones). So the fact that less Sr-90 has got out is good news.
At Chernobyl Mo-99 and Ru-106 escaped from the reactor (Tc-99m is the daughter of Mo-99), this is likely to have occurred as a result of the Chernobyl fuel being heated in air by the fire. The Mo would have got oxidised to form MoO3 which is volatile, while the Ru was converted into RuO4 which is a gas. An alternative route out of the reactor at Chernobyl was the steam explosion which flung fuel out of the reactor, no such dire explosion occurred in Japan. Also neither of these isotopes were found in the soil in Japan then it is good news.
I will comment on the other data which is from the JAEA in the near future.

Go on, Have your say !

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s

%d bloggers like this: