Radioactive dating lab
Date:17 February 2017 | Author: AdminI have writtenbr up some of mybr gtfindings httpmichaelbriggsaeroektarbr br A belated thank you for posting this it really is much morebr definitebr than the info Ive been able to pick up. Day Day labeled as on your grading sheetbr If you want to buy some slightly radioactive lenses and cameras the. br I have been researching thoriumcontaining glasses and especially thebr Kodakbr AeroEktars. I have writtenbr up some of mybr gtfindings httpmichaelbriggsaeroektarbr br Long thread snipped. The model indicated that the seventh row of the periodic table should also have fshells filling before the dshells that were filled in the transition elements like the sixth row with the lanthanides preceding the d transition metals
Br He uses that lens on a custom mount for a Visoflex III. Increasing the temperature also speeds up the reaction but temperatures of C and above must be avoided because they cause insoluble thorium pyrophosphate to form. br gt dickburkbr Date Mon Sep br From Bob Shell bobbr Subject Re Rollei Off topic Voigtlander Lantharbr Im sure someone here knows the optical formula. br Eric Goldsteinbr From Koni Omega Mailing Listbr Date Mon Mar br From GRAPHICbr Subject Re KOML Lensesbr br re radioactive glass Apparently just because the elements are radioactive that does not meanbr that the lens was dsigned as an quotapoquot. br The Aklin patent which seems to be the AeroEktar indicates glassbr indexbr and v values which must be one of the glass types in the abovebr patents orbr some other related formula. e Th is not fissionable but it is fertile as it can be converted to fissile U by neutron capture and subsequent beta decay
Newer lensesbr could bebr showing the improvements coming from improved refining methods forbr the rarebr earths. Bothbr lenses are good performeres by the way. br Can any of you pros confirm this How hard is this to do yourselfbr Thanksbr Markbr From camera fix mailing listbr br Date Wed Sep br From John Barlow BARLOWJGbr Subject RE Yellowed Takumar mm curebr The best info I have found on replacing the balsam cement in lensesbr is onbr the S K Grimes site br The description is for large format lenses but I expect it is ok forbr allbr formats. This will help me know what I am notbr explainingbr clearly. br gtbr gtAny commentsbr Yes. endquotebr The reported MEASURED radiation levels I have seen on aeroektars arebr br milliremhr and milliremshr. Danbr According to Roger Hicks in Shutterbug Aero Ektars emit gamma radiation. Thorium dioxide is found in heatresistant ceramics such as hightemperature laboratory crucibles either as the primary ingredient or as an addition to zirconium dioxide. My reasoning is based on a recent article in Shutterbugbr about radioactive glass that specifically sites the Asahi or Honeywell Pentax standard mm lensesbr circa. The chemical toxicity of thorium is low because thorium and its most common compounds mostly the dioxide are poorly soluble in water precipitating out before entering the body as the hydroxide. The Th ion is soluble especially in acidic soils and in such conditions the thorium concentration can reach ppm. Thorium is odourless and tasteless. These are much hotter than the licensed gammabr standards we have to store in lead quotpigsquot in our campus science labsbr etc. Original Site httpmfThorium has three known nuclear isomers or metastable states m Th m Th and m Th. br Marcbr msmallbr Date Wed Aug br To rolleibr From Matthew Phillips mlphilligtbr Subject Re Rollei Rollei Urban Legendsbr br gtThis is great info
Day Different isotopes of thorium are chemically identical but have slightly differing physical properties for example the densities of pure Th Th Th and Th are respectively expected to be and gcm . Fourfifths of the thorium present at Earths formation has survived to the present. Richard my internet pal Bobbr Howard hadbr gtone as the original owner and always claimed the lenses werebr tremendous butbr gtthe ergonomics were horrendous He passed away a few years ago and Ibr do notbr gtknow what his daughter did with this set. br Unfortunately I cant be more specific on which lenses used thoriumcontaining glasses I onlybr know thanks again to Erwin Puts that a few lenses were designed Mobile dating site for nigeria with such glasses. Until it used glass from CP Goerz in Berlin and then after the Zeissbr Ikon merger closed that facility shifted to Schott glass first from Jena and after the Secondbr World War from Mainz. Its first applications were developed in the late th century. The advantage is I suppose thatbr the online dating asking her out lens gives great sky contrast. As a hard Lewis acid Th favours hard ligands with oxygen atoms as donors complexes with sulfur atoms as donors are less stable and are more prone to hydrolysis. The definition of these three types of materialbr canbr be found at this DOE web sitebr httpoepalawsumbr The full NRC regulations can be dating ex husbands brother found herebr httpreadingrmdoccollectionscfrbr The text makes for endlessly convoluted reading but lets cut to thebr chase. Thoriums radioactivity was widely acknowledged during the first decades of the th century
More recent pieces can be harder to hookup new york test. So overbr the years your quothotquot lenses are likely to get more radioactive rather than less. Intriguingly some ApoLanthars arebr hot andbr gt others arent presumably reflecting different sources of lanthanumbr orbr gt improved refining techniques from a single source. Is there any regulation concerning the ammount ofbr thoriumbr concentration in lenses br Thanking you in advance for your collaboration I remainbr Sincerely yoursbr V. Day Day Agency of Natural Resourcesbr Department of Environmental Conservation br Main Building nd Floorbr One National Life Drivebr Montpelier VTbr Students erica from love and hip hop dating floyd can supplement this site with a visit to Isotopes Project. These maybr only have been the few that incorporated glass from Leicas own small glass lab. br I am another who thinks Kodak was probably making the best lenses inbr thebr world during the period Rudolf Kingslake was running their opticalbr department. Other lenses may havebr coloration biases which make them slightly yellowish rather than clear or other colors depending br on the glass. br For your web page on radioactive lenses you might want to include abr disclaimerbr that some of the compiled information is probably wrong
Thorium nitrate pentahydrate was the first known example of coordination number the oxalate tetrahydrate has coordination number and the borohydride first prepared in the Manhattan Project has coordination number. br Can anyone pardon the pun shed some light on what is happening tobr thebr glass to cause the discoloration After light bleaching is therebr remainingbr damage such as a change in indexbr Thanks for your comments. This is from the first series of this lens. br gt Since the lenses employing it were made for war time use theirbr immediatebr gt performance was much more important than long life essentiallybr they werebr gt considered expendibles
Br gt I have best free gamer dating sites no information as to which specific lenses used Thoriumbr glass. br Many terms were used such as Kodak special glass borate glass nonsilicatebr glass. If this is truebr gtthei lens might exhibit some blue fringing. In bringing it back to html the conversion has compressed out the line returns that Bob had introduced between messages. Butbr they arebr quothotquot. The development ofbr radiation resistant nonbrowning optical glass International dating site china for use in defense or nuclear monitoring has beenbr an ongoing project of optical glass makers. Heinz Anderlebr From Rollei Mailing listbr Date Sun Feb br From Richard Knoppow dickburkbr Subject Re Rollei Re My Retina died yesterday RIPbr you wrotebr gtRichard Knoppow wrotebr gtbr gtgt The mm f is a six element Planar or rather Biotar type. Thoriated tungsten has much higher emmission than plain tungsten. . br gtgt br gtgt Richard Knoppowbr gtgt Los dating site for dentists AngelesCa
Thebr gt German optics had yellow plus purple color coating Dating an older single man from that period. When heated it emits intense blue light through rsvp dating site phone number incandescence the light becomes white when ThO is mixed with its lighter homologue cerium dioxide CeO ceria this is the basis for its previously common application in gas mantles. br Only that paticular lens though. So the lens looks up to thebr heavensbr rather then down on the earth. As many have said dont sleep with one of these lenses
Br br After students have completed the activity discuss the answers to the analysis questions with the whole class. br Eric Goldsteinbr From Koni Omega Mailing Listbr Date Mon Mar br From GRAPHICbr Subject Re KOML Lensesbr br re radioactive glass Apparently just because the elements are radioactive that does not meanbr that the lens was dsigned as an quotapoquot. T. br gtbr gtIf you do not know about radioactive lenses check out this linkbr gtbr gthttprmonaghamfbr gtbr gtI own of these yellow lenses. The Photograhic Periodic Table of the Elements can be used to find all the known isotopes of all the elements their decay modes and halflives