I wonder about the climate impact of the series of multi-megaton surface blasts by the US and USSR in the 1950's and 1960's. These tests put both dust and radionuclides into the atmosphere in large, possibly globally-significant quantities. When we see surface temperature changes over the last 50 years, how much of that is a recovery from an abnormal climate?
Why haven't radiation oncologists produced good data on this? Many, many people are exposed to substantial radiation doses in the treatment of cancer. And their progress and outcomes is tracked by the tremendous statistical measurements of modern oncology. (This statistical rigor is a big chunk of the improvement in cancer treatment over the last generation or two).
Of course there are huge confounding factors, including that the patient already has cancer, is exposed to carcinogenic chemotherapy regimens, and so on. But it would seem to me that with such a large dataset--along with the long-term tracking--the quantitative danger and damage due to smaller and smaller doses of radiation would be measurable.
I ran across this paper on nano scale production of zinc oxide by a laser ablation method. If the ZnO is being used as a catalyst, nanostructures are useful for their increased surface area.
This might be useful for those amateur chemists wanting to build their own at home.
Yang, Li, Paul W May, Lei Yin, and Tom B Scott. 2007. “Growth of self-assembled ZnO nanoleaf from aqueous solution by pulsed laser ablation.” Nanotechnology 18(21):215602. Retrieved April 5, 2012. http://www.chm.bris.ac.uk/pt/diamond/pdf/drm17-931.pdf
A nuclear transition in triply-ionized 229Th has been found which is particularly insensitive to external magnetic fields and electron configuration, which gives the potential for a very stable clock,several orders of magnitude better than current clocks if phase comparisons can be made across a scale of days or weeks. The transition energy is at 163nm (in the ultraviolet). To take advantage of this clock an extremely stable laser at this wavelength (using current best clocks) will need to be created.
They're already working on shutting down the thrift shops. Last year the Consumer Product Safety Improvement Act came on line. Though it's not being strictly enforced yet, the law puts strict liability on resellers for "dangerous" products, requiring testing for lead and phthalates.
Slashdot Mirror
I wonder about the climate impact of the series of multi-megaton surface blasts by the US and USSR in the 1950's and 1960's. These tests put both dust and radionuclides into the atmosphere in large, possibly globally-significant quantities. When we see surface temperature changes over the last 50 years, how much of that is a recovery from an abnormal climate?
Why haven't radiation oncologists produced good data on this? Many, many people are exposed to substantial radiation doses in the treatment of cancer. And their progress and outcomes is tracked by the tremendous statistical measurements of modern oncology. (This statistical rigor is a big chunk of the improvement in cancer treatment over the last generation or two).
Of course there are huge confounding factors, including that the patient already has cancer, is exposed to carcinogenic chemotherapy regimens, and so on. But it would seem to me that with such a large dataset--along with the long-term tracking--the quantitative danger and damage due to smaller and smaller doses of radiation would be measurable.
I ran across this paper on nano scale production of zinc oxide by a laser ablation method. If the ZnO is being used as a catalyst, nanostructures are useful for their increased surface area.
This might be useful for those amateur chemists wanting to build their own at home.
Yang, Li, Paul W May, Lei Yin, and Tom B Scott. 2007. “Growth of self-assembled ZnO nanoleaf from aqueous solution by pulsed laser ablation.” Nanotechnology 18(21):215602. Retrieved April 5, 2012. http://www.chm.bris.ac.uk/pt/diamond/pdf/drm17-931.pdf
A preprint is available on arXiv at http://arxiv.org/abs/1110.2490
A nuclear transition in triply-ionized 229Th has been found which is particularly insensitive to external magnetic fields and electron configuration, which gives the potential for a very stable clock,several orders of magnitude better than current clocks if phase comparisons can be made across a scale of days or weeks. The transition energy is at 163nm (in the ultraviolet). To take advantage of this clock an extremely stable laser at this wavelength (using current best clocks) will need to be created.
They're already working on shutting down the thrift shops. Last year the Consumer Product Safety Improvement Act came on line. Though it's not being strictly enforced yet, the law puts strict liability on resellers for "dangerous" products, requiring testing for lead and phthalates.