7/2.4 = 2.92; So, it was different by a factor of 2.92, not by a factor of 2 -- is that better?
You state that Gregger said 200 days X 1/2 hour/day = 1 Rad (to the exposed area)
You say I stated 200 days x 1 hour/day = 4 Rads (to the exposed area); thus for 1/2 hour, instead of 1 hour, that would be 2 Rads
Last time I checked, 1 Rad / 2 Rads = 1/2; that is, we were different by a factor of 2;
Isn't that what I said? Where's the problem? We're both agreed that it is unnecessary exposure, and yes, the risk is relatively low (though not non-existent, unless you believe in the LNT hypothesis, which is essentially discredited, though I won't go into that here).
Incidentally, I only did a cursory survey with a cheap piece of equipment that did not measure absolute energy, rather only the presence/absence of beta radiation. My exposure rate was for the skin-entrance exposure, which is definitely higher than the average for a 1 cm depth. I believe Gregger's exposure was for the average, which is likely the explanation for the factor of 2 discrepancy. To calculate the energy (Rads), I used the absolute count (which was fairly accurate) and the theoretical (from the book) energies of the betas. Thus, we had remarkably similar agreement, if you do the skin entrance exposure, rather than the average exposure.
The point of all this is that I would not want my kids sitting around on that Uranium day after day, which some kids do, even if the risk is low. Why take on additional risks when we already have enough in life, as is?
Also, while a whole-body exposure for an adult of 1 Rad gives a lifetime added risk of less than 1/10,000 for a cancer, it is not well-quantified what the risk is for kids. We do know that CT scans in kids have been shown to show a statistical increase in cancers, though not yet shown in adults. It is known that the younger the person exposed (if not an adult), the greater the risk. Infants/toddlers are at greatest risk, and in the houses in that neighborhood, there might well be tiled floors with such infants/toddlers crawling around for hours on end on Uranium tiles; just as might be the case in many older neighborhoods across the US, in Canada, in Europe, and elsewhere where such Uranium tiles were placed and are still in place.
But isn't this missing the point of this thread? Why not start another thread that is more apropos, and I'll correct your misunderstandings there.
As to Russia and China, both on the Security Council, and their seeming lack of concern regarding yet another State (Iran) potentially going nuclear-weapons, I have no idea what their 'thinking' is. However, last week I heard from our HPS president-elect, who's just finished cleaning up after the Russians along the arctic coast via his IAEA employment, that their Soviet predecessor state literally abandonded 1000 sealed-source thermo-electric generators that had been used to power lighthouses along the arctic coast. You likely heard about this via the news media, when it was reported a few years ago that one of them was found by some woodsmen who used it to keep warm overnight, only to suffer massive radiation burns (I believe they died). They were 20,000 Curie sources - quite deadly. All are reported now to have been recovered, as well as numerous other abandoned sources.
So yes, Uranium-tiles pale in comparison to other ills of the world.
Potential strangelets that could destroy the planet, etc., however, are potentially of greater concern, so I return this thread back to its original content. If you wish to comment on other topics, start a thread, and I'll respond.
Walter L. Wagner (Dr.)
You state that Gregger said 200 days X 1/2 hour/day = 1 Rad (to the exposed area)
You say I stated 200 days x 1 hour/day = 4 Rads (to the exposed area); thus for 1/2 hour, instead of 1 hour, that would be 2 Rads
Last time I checked, 1 Rad / 2 Rads = 1/2; that is, we were different by a factor of 2;
Isn't that what I said? Where's the problem? We're both agreed that it is unnecessary exposure, and yes, the risk is relatively low (though not non-existent, unless you believe in the LNT hypothesis, which is essentially discredited, though I won't go into that here).
Incidentally, I only did a cursory survey with a cheap piece of equipment that did not measure absolute energy, rather only the presence/absence of beta radiation. My exposure rate was for the skin-entrance exposure, which is definitely higher than the average for a 1 cm depth. I believe Gregger's exposure was for the average, which is likely the explanation for the factor of 2 discrepancy. To calculate the energy (Rads), I used the absolute count (which was fairly accurate) and the theoretical (from the book) energies of the betas. Thus, we had remarkably similar agreement, if you do the skin entrance exposure, rather than the average exposure.
The point of all this is that I would not want my kids sitting around on that Uranium day after day, which some kids do, even if the risk is low. Why take on additional risks when we already have enough in life, as is?
Also, while a whole-body exposure for an adult of 1 Rad gives a lifetime added risk of less than 1/10,000 for a cancer, it is not well-quantified what the risk is for kids. We do know that CT scans in kids have been shown to show a statistical increase in cancers, though not yet shown in adults. It is known that the younger the person exposed (if not an adult), the greater the risk. Infants/toddlers are at greatest risk, and in the houses in that neighborhood, there might well be tiled floors with such infants/toddlers crawling around for hours on end on Uranium tiles; just as might be the case in many older neighborhoods across the US, in Canada, in Europe, and elsewhere where such Uranium tiles were placed and are still in place.
But isn't this missing the point of this thread? Why not start another thread that is more apropos, and I'll correct your misunderstandings there.
As to Russia and China, both on the Security Council, and their seeming lack of concern regarding yet another State (Iran) potentially going nuclear-weapons, I have no idea what their 'thinking' is. However, last week I heard from our HPS president-elect, who's just finished cleaning up after the Russians along the arctic coast via his IAEA employment, that their Soviet predecessor state literally abandonded 1000 sealed-source thermo-electric generators that had been used to power lighthouses along the arctic coast. You likely heard about this via the news media, when it was reported a few years ago that one of them was found by some woodsmen who used it to keep warm overnight, only to suffer massive radiation burns (I believe they died). They were 20,000 Curie sources - quite deadly. All are reported now to have been recovered, as well as numerous other abandoned sources.
So yes, Uranium-tiles pale in comparison to other ills of the world.
Potential strangelets that could destroy the planet, etc., however, are potentially of greater concern, so I return this thread back to its original content. If you wish to comment on other topics, start a thread, and I'll respond.
Walter L. Wagner (Dr.)