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30-Oct-2016 04:19

Rather than let such information disappear into the ether, occassionally I have reproduced some or all of it here. If I have reproduced this inappropriately and you are its original author, please contact me and I will remove it.Notes: The site still exists, but many of the pages seem to be no longer maintained and available and I have not been able to reach the original site developer, Robert Monaghan, who collected and edited the following information from use net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.Related rare earth such as lanthanum are often produced from the same sources, with monazite being up to 25% lanthanum.This decay process means these thoriated glass lenses can gradually become more radioactive over time, as the more highly radioactive decay products build up in the glass. You would expect the radioactivity to decrease over time.

Over time, the thorium decays, and the levels of radioactive daughter by-products builds up.An amateur treasure hunter in Germany has stumbled upon what could be radioactive material from a secret research facility dating back to World War II.64-year-old Bernd Thälmann was exploring the ground in Oranienburg, north-east Germany, with his metal detector when it gave an unusual ‘bleep’.However, Mr Karlsch’s theory was discredited by Gerald Kirchner of Germany’s Federal Office for Radiation Protection.Over the course of the development of this site, I have come upon and linked to many other sites containing interesting and related information.

Over time, the thorium decays, and the levels of radioactive daughter by-products builds up.An amateur treasure hunter in Germany has stumbled upon what could be radioactive material from a secret research facility dating back to World War II.64-year-old Bernd Thälmann was exploring the ground in Oranienburg, north-east Germany, with his metal detector when it gave an unusual ‘bleep’.However, Mr Karlsch’s theory was discredited by Gerald Kirchner of Germany’s Federal Office for Radiation Protection.Over the course of the development of this site, I have come upon and linked to many other sites containing interesting and related information.Cerium is often added to glass to convert iron impurities into colorless compounds, yielding clear glass suitable for optical uses.