Ludwik Posted September 2, 2011 #1 Share Posted September 2, 2011 1) Those interested in recently measured (?) radiation levels (at different distances from the Fukushima reactors in Japan) should see: http://www.meti.go.jp/earthquake/nuclear/pdf/monitor02_01.pdf (dose levels measured 1 meter above the ground) http://www.meti.go.jp/earthquake/nuclear/pdf/monitor02_02.pdf (dose levels measured 1 centimeter above the ground) Note that the color code is explained near the lowere left corner of each dispay. Radiation levels are expressed in micro-Sieverts per hour. [The 10 micro-sieverts, for example, is the same as 0.01 mSv, etc. And 10 micro-Sievert is the same as 0.24 mSv/day, or into 7.2 mSv/month.] 2) The effect of penetrating radiation on a person depends on the dose received. The common unit of dose is Sievert (Sv). Smaller doses are expressed in milliseverts (mSv) or microseveret. A dose of 10 Sv will most likely results in death, within a day or two. 5 Sv would kill about 50% of exposed people. 2 Sv can also be fatal, especially without prompt treatment. 0.25 Sv = 250 mSv is the limit for emergency workers in life-saving operations. 0.10 Sv = 100 mSv dose is clearly linked to later cancer risks. 0.05 Sv = 50 mSv is the yearly limit for radiation workers. 0.004 Sv= 4 mSv typical yearly dose due to natural radiation (cosmic rays, etc). 0.003 Sv= 3 mSV typical dose from mammogram Ludwik Kowalski (see Wikipedia) . Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now