How to check if the radioactivity is normal ?
Lots of information about radiation levels are available. But at first glance, these data seem incomprehensible to anyone who didn’t have an advanced degree in nuclear physics . Here is a simple tutorial to calculate the biological impact of a given radiation exposure.
- Pick up your radiation measurement source :
– Tsukuba 1
– Tsukuba 2
– Tokyo (Hongo, Komaba, Kashiwa)
– Tokyo (Shinjuku)
– Average Japan by area
– Crowd-sourced from all over Japan
- If the measure is in microsievert per hour (uSv/h), divide by 1000. You obtain a value in millisievert per hour (mSv/h).
- Multiply by the time of exposure in hour. You obtain a value in millisievert (mSv).
- Calculate the biological impact of the exposition to the radiation with the chart below.
- We take average value for Tokyo area (line 13) given by Japanese government on March 17th : 0.05 uSv/h.
- We divide by 1000 : 0.05/1000 = 0.00005 mSv/h.
- The time of exposure is 24 hours so we multiply by 24. 0.00005*24 = 0.0012 mSv. If we multiply this value by 365 to compare it with annual values, we obtain : 0.0012*365 = 0.438 mSv.
- Following the chart, the radiation dose received for an annual exposition to this radiation level is equivalent to the one received for an annual exposition to the natural background (~0.48 mSv). There is no need to take any emergency measure.
Please send me your other radiation level sources. Please translate this post into Japanese. Please broadcast !