According to this study, we need to be in a range of radiation exposure daily to have the "BioPositive" effect of radiation. Read the article to understand why.
Since one uGy (migro Gray unit) is equivalent to 1 uSv (on micro Sievert). We can say that we need to be in the range of roughly 10 to 5000 uGy/year radiation level or 0.02 to 13.6 uSv/day to get the optimal effect.
According to health Canada data, the major Canadian cities are in average, in that range for uSv/day dose.
- Montreal : 0.44
- Ottawa: 0.40
- Toronto: 0.28
- St. John's : 0.68
Actually, we are a little bit on the low end of the graph. So we would need a bit more radiation to have an optimal effect.
What is the optimal effect ? LESS CANCER...
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