Tesekkur ederim bilgiler icin ama baz aldiginiz nokta cok mantikli degil. Amerika insan sagligini ve canına en az onem veren ulkelerden biri. Sokaktan gecen adama silah satan bir ulkeden bahsediyoruz. Ayrıca ortaya su zarari vardir seklinde bir kanit koyulamamasi kesinlikle tehlikesiz bir urundur dememize olanak saglamamali. Nereden yola ciktiginizla alakali bir durum bence bu. Fazla teknik bilgim yok tabi bu konuyla ilgili fakat bazi sorunlarin ihtimal dahilinde olmasi bile bence rahatsizlik verici bir durum.

Uzun uzadiya yazmak istemezdim ama asagidaki yazi bile beni rahatsiz ediyor anlatabiliyor muyum. Muhtemelen fikrim degismeyecek.

Just how radioactive are typical "hot" lenses? Studies of a half dozen Leica lenses (see postings below) came up with 1.5 milliroentgens/hr. This figure compares to 20 milliroentgens (mrem) per day maximum permissible dosage in many western countries. But that 20 mrem is for whole body exposure, while the lenses mostly emit shorter range beta and alpha particles. On the other hand, it may take just a single gamma ray to turn one of your cells into a cancerous cell and cause a tumor. These 1.5 mrem/hr levels are surprisingly high compared to typical levels for radiation sources used in scientific and civil defense training (often 2 or 3 orders of magnitude lower levels). Don't tell OSHA or the EPA, or all those collectible Leica lenses may end up in a secret government landfill!

Just how radioactive are typical "hot" lenses? Studies of a half dozen Leica lenses (see postings below) came up with 1.5 milliroentgens/hr. This figure compares to 20 milliroentgens (mrem) per day maximum permissible dosage in many western countries. But that 20 mrem is for whole body exposure, while the lenses mostly emit shorter range beta and alpha particles. On the other hand, it may take just a single gamma ray to turn one of your cells into a cancerous cell and cause a tumor. These 1.5 mrem/hr levels are surprisingly high compared to typical levels for radiation sources used in scientific and civil defense training (often 2 or 3 orders of magnitude lower levels). Don't tell OSHA or the EPA, or all those collectible Leica lenses may end up in a secret government landfill!

Another professional danger is potential fogging of film due to prolonged close proximity in your camera bag between "hot" lenses and your sensitive film stocks. Surprise! Finally, I was firmly put down by some Leica collectors because the official factory sources had denied that any Leica lenses were radioactive. This stand was maintained despite a number of reports confirming that tests had shown various Leica lenses were indeed radioactive (e.g., 1.5 millirems). Turns out that the factory was well aware of these "hot" or radioactive glass lenses, but Leitz management had denied them for years (see postings below and LHSA articles). So the final casualty here is the believability of various "published" and "official" sources of information about lenses, which have denied that their lenses were radioactive to any degree. Thanks to this page and these posters and related articles and lens testing, we now know better. Chances are rather good that if you have many older lenses from the mid-1960s and before, that you have one or more radioactive glass lenses in your collection.

Radioactive lenses