Lead-containing glasses

Lead-loaded plastics containing up to 90 wt % lead are used in x-ray protection as aprons and temporary shields in medical and industrial appHcations. Leaded glass is used to attenuate radiation where viewing the ongoing process is requited. Steel-jacketed containers fihed with lead or special lead containers are used to transfer, ship, and store fuel rods, radioactive sources, and nuclear waste. Lead is generahy used where space is limited. 

Storage stability Stable in glass, lead-lined, or enamel-lined containers reaction with iron may be explosive. Vigorous corrosive action on all common metals except lead reaction with iron may be explosive. 

Sometimes it may be necessary to use the peptides solubilized and unbound to the cellulose membrane. If it is necessary to release the peptides from the membrane, one method is to expose the entire dry membrane overnight in a glass desiccator containing ammonia gas. The strong basic environment leads to a break of the ester bond to the cellulose by forming a C-terminal amide (see Note 8). The next day, punch out the spots and transfer the discs into wells of microtiter plates (MTPs) or into vials in which you can dissolve and test the released peptides (see Note 9). If a free carboxy terminal is desired on the peptides, then do not treat the membrane with ammonia gas, punch out the spots and expose them to a basic aqueous solution, for example, ammonium hydroxide or sodium hydroxide (26). 

PZG is characterized by a high lead content, which results in a high refractive index for that glass. ZnSB, with 80-90% Zn—Sr—Ba, is an example of divalent fluoride glass. CNBZn and CNBK are chlorofluoride glasses, which contain 22 and 33 mol% CdCl2 in addition to divalent and monovalent fluorides. 

T7or the past 10 years extensive effort has been devoted to studying the isotopic ratios of the element lead contained in glasses, glazes, and pigments and from bronze, gold, and silver items from the ancient world... 

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