I am taken by surprise since the radiation readings in the rainwater drainage pit recorded a radiation dose rate of 0.15 uSv/hr (beta+gamma) which is roughly double the background radiation in this area (I am comparing with the normal time background radiation only because that are the only values I have to compare with normal time though I understand that both are not the same).
The ambient radiation levels recorded away from this point is 0.1 uSv/hr.
All these days, I was in the opinion that we are relatively safe from soil contamination since we are away from Fukushima. No, we are not! Our soil is contaminated....the reason that I could record in this pit is because it accumulates the runoff from the roof.
Explanation on why I said it is elevated: I think I should clarify what I mean by elevated levels. This is first highest value I have recorded to date in our location! The soil readings I recorded about a month ago was 0.09 uSv/h in front of our home; the indoor reading yesterday was 0.1 uSv/hr, background radiation at 10 feet away from this drain was 0.1 uSv/hr. So, I was talking in relative terms.
I agree that this reading is nothing in comparison to what people have been reporting from elsewhere. However, reading an 'elevated/higher level' at one spot than other spots in the same location does qualify it to be contaminated, warranting precaution, isn't it?
The immediate decision to be implemented is:
- not allowing my kid playing outside without attending to him,
- to be cautious while cleaning the home, especially the dusty areas include air vents, door panels and screens,
- cautious, cautious, and cautious.