(For brevity's sake, hereafter I will refer to the parent isotope as ).
In addition, it requires that these measurements be taken from several different objects which all formed at the same time from a common pool of materials.
The electronics, computers and communications industries, power engineering and much of the chemical industry of today were founded on discoveries made possible by the battery.
Pioneers It is often overlooked that throughout the nineteenth century, most of the electrical experimenters, inventors and engineers who made these advances possible had to make their own batteries before they could start their investigations. the World was starting to emerge from the Stone Age. C., Mesopotamians (from modern day Iraq), who had already been active for hundreds of years in primitive metallurgy extracting metals such as copper from their ores, led the way into the Bronze Age when artisans in the cities of Ur and Babylon discovered the properties of bronze and began to use it in place of copper in the production of tools, weapons and armour.
Notes: The site still exists, but many of the pages seem to be no longer maintained and available and I have not been able to reach the original site developer, Robert Monaghan, who collected and edited the following information from use net postings.
This was restored from a copy I made in November 2003; Bob may have added to or edited this page after that. Industar 61 lens (lanthanum glass) Lens Faults Pages Photo. Maybe some of those bargains you got on EBAY are "hot" in a different sense than you might have thought!
Net on Radioactive Lenses (gamma levels..) Radioactive Fed-5s (slight..) Radioactive Optics Posting (WJM) Radioactive Pentax Lens (GM tube sound file..) Romancing the Rare Earths On Enhancing Filters by Howard Ross U. Govt Surplus "Hot" Cameras and Lenses You will find two kinds of radioactive lenses - those that were contaminated and sold as government surplus, and those that are naturally "hot" or radioactive due to the radioactive elements or radioactive impurities used in their manufacture. I am assuming that heavily contaminated and radioactive government surplus items end up in government low level radioactive waste land-fills or other burial sites.
If you want to buy some slightly radioactive lenses and cameras, the U. So if your government surplus bargain camera or lens is contaminated, it is probably only "lightly" contaminated. "Hot" Lenses made from Radioactive Materials Many specialty optical glasses have radioactive elements added to them, either as desired components or as impurities in the mixtures being used.Over the course of the development of this site, I have come upon and linked to many other sites containing interesting and related information.Sometimes in checking links, I find that those sites have disappeared. Here, at the Cortez Mine, in Nevada, high-tech prospectors are moving mountains, closing in from above and below. Which raises a question: if the gold is invisible to the naked eye, how do they even know if they're digging in the right place? Eight bars, million, sitting on this unassuming little table. Of all the elements that touch our lives, nothing drives humankind to acts of love or destruction like gold. Copper alone is impressive stuff, but when ancient metallurgists combined it with another element, they invented a much tougher material that went on to conquer the world. Tin; symbol Sn; atomic number 50—50 protons and 50 electrons. If you're like me, you care about the elements and how they go together,… The problem is it's exceedingly rare stuff in the earth's crust, and it's getting harder to find all the time. Mike tells me that each bar represents about a million pounds of rock that had to be moved and processed.Background We think of a battery today as a source of portable power, but it is no exaggeration to say that the battery is one of the most important inventions in the history of mankind.