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"On May 26, 2011, the Agency [Texas Department of Health] was notified during routine inspections of the facility's site safety systems, it was discovered that two tritium exit signs were missing from their fixed mounting positions. These signs were affixed to the walls near exits in a secure manner such that they could only be removed by means of removing safety capped mounting screws and then the use of tools to remove them. In this case, it is apparent that these signs were removed by way of vandalism and were essentially pulled off the walls leaving evidence that they were removed without the knowledge of the site personnel.
"In addition, this same vandalistic act occurred at the same location as reported to the Agency [Texas Department of Health] on February 2, 2011. At that time, four tritium exit signs were removed.A report was made to local law enforcement. The exit signs are Isolite Model 2040-95S-B-15-WS, and each contain 9.5 Curies of tritium." Texas Incident: # I-8858
A tritium exit sign was found damaged on March 31, 2010, at Bed Bath & Beyond in Saratoga Springs. On April 6, 2010, Shaw Environmental Group was granted reciprocity to survey, decontaminate and package the broken sign.
"On May 3, 2011, the Agency [Texas Department of Health] was notified by the licensee that a Troxler Model 3430 moisture/density gauge had been stolen from the back of one of their trucks. The gauge was stolen at the intersection of Nalor and North Main in Houston, Texas. The gauge contains a 40 milliCurie Americium (Am) - 241 source, and an eight milliCurie Cesium (Cs) -137 source. The licensee reported that their technician had completed his work and returned to the licensee's facility. When the technician went to the back of the truck to get the gauge, he found the gauge missing, one chain and lock missing, and the other lock had a busted bail. The technician contacted the other licensee's technicians who were at the work site to see if any of them had the gauge. No one did. The technician contacted his manager and reported the missing gauge. The licensee contacted local law enforcement and notified them of the theft.
How do they work?
Self Luminous Tritium Exit signs do not require electricity or batteries for illumination. Because they don't require electric wiring, they are being installed in greater numbers in public and private buildings. A self-luminous sign remains lighted continuously, though you won't detect any illumination during daylight hours or in brightly lit rooms. In addition, self-luminous signs will maintain their illumination day in, day out, for up to twenty years. This no-cost, maintenance-free operation is why many building owners specify self-luminous signs: It saves them money while providing safe and reliable exit location identification. All self-luminous signs work on the same principle. They are powered by tritium gas, a low-level isotope of hydrogen.
Originally posted by highfreq
I'm an electrician and I have literally installed hundreds of exit signs. What kind of exit sign uses tritium and what is it's function of operation in an exit sign?
Self Luminous Tritium Exit signs do not require electricity or batteries for illumination. Because they don't require electric wiring, they are being installed in greater numbers in public and private buildings. A self-luminous sign remains lighted continuously, though you won't detect any illumination during daylight hours or in brightly lit rooms. In addition, self-luminous signs will maintain their illumination day in, day out, for up to twenty years. This no-cost, maintenance-free operation is why many building owners specify self-luminous signs: It saves them money while providing safe and reliable exit location identification. All self-luminous signs work on the same principle. They are powered by tritium gas, a low-level isotope of hydrogen.
Self-luminous exit signs use the electron from the tritium to provide illumination without the need for a source of electrical power. The process is very similar to that in your television set picture tube where an electron is used to illuminate the front screen of the tube. The electron from tritium however has only about ¼ of the energy of the electron in a color TV picture tube. That is why self-luminous exit signs are not visible in daylight while TV pictures are.
To produce the illumination, the tritium gas is contained within a hermetically sealed glass tube. The inside surfaces of the tube are coated with a phosphor (A) just like the inside surface of a television picture tube. Electrons emitted by the tritium (B) bombard the phosphor causing it to produce illumination.
Originally posted by highfreq
I'm an electrician and I have literally installed hundreds of exit signs. What kind of exit sign uses tritium and what is it's function of operation in an exit sign?
Originally posted by Wildmanimal
reply to post by muzzleflash
Hey Muzzleflash, I wondered about that myself. This has been going on for a while at colleges,theaters,malls,
etc. Those signs cost between 125 and 260 dollars each. So that may have something to do with it. Also,
Tritium is $30,000 a gram. Attached is an article concerning tritium theft from 1989 that I thought might interest you.
Link www.nytimes.com...
Originally posted by Version100
Originally posted by highfreq
I'm an electrician and I have literally installed hundreds of exit signs. What kind of exit sign uses tritium and what is it's function of operation in an exit sign?
Tritium signs/watchfaces do not require electricity.
They glow with no power.
The NRC estimates that over 2 million of these signs are in use in the USA.
Originally posted by Unity_99
I read somewhere that the US has been disposing of its nuclear waste, or some of it, secretely mixing it into highways/roadways, and bridges, and in signs. Its known to be in things that combust, jet parts, race car parts, solar panels, dyes and artists supplies. Its also been mixed "accidentally oops" with the scrap metals of the world.
Lovely, eh?
Hahn, nicknamed the "Radioactive Boy Scout", is an Eagle Scout who received a merit badge in Atomic Energy and spent years tinkering with basement chemistry which sometimes resulted in small explosions and other mishaps. He was inspired in part by reading The Golden Book of Chemistry Experiments, and tried to collect samples of every element in the periodic table, including the radioactive ones. Hahn diligently amassed this radioactive material by collecting small amounts from household products, such as americium from smoke detectors, thorium from camping lantern mantles, radium from clocks and tritium (as neutron moderator) from gunsights. His "reactor" was a large, bored-out block of lead, and he used lithium from $1,000 worth of purchased[1] batteries to purify the thorium ash using a Bunsen burner.[2]
Hahn posed as an adult scientist or professor to gain the trust of many professionals in letters, despite the presence of misspellings and obvious errors in his letters to them. Hahn ultimately hoped to create a breeder reactor, using low-level isotopes to transform samples of thorium and uranium into fissionable isotopes.[3]
Although his homemade reactor never achieved critical mass, it ended up emitting dangerous levels of radioactivity, likely well over 1,000 times normal background radiation. Alarmed, Hahn began to dismantle his experiments, but a chance encounter with police led to the discovery of his activities, which triggered a Federal Radiological Emergency Response involving the FBI and the Nuclear Regulatory Commission. On June 26, 1995 the United States Environmental Protection Agency, having designated Hahn's mother's property as a Superfund hazardous materials cleanup site, dismantled the shed and its contents and buried them as low-level radioactive waste in Utah. Hahn refused medical evaluation for radiation exposure.