![]() Despite promethium having 38 known isotopes, 147Pm is by far the most utilized and useful one. The only element in the lanthanide series of the periodic table with no stable isotopes, Pm has found an impressive number of applications since its announcement in 1947 after World War II. Promethium (Pm), element #61, got its name from the Greek Titan Prometheus, who stole fire from Zeus and passed it to people. 2Chemistry Education Research and Practice Laboratory, SCAMT Institute, ITMO University, Saint Petersburg, Russia.Check our timepieces showcasing glow-in-the-dark innovation at its finest.Veronika Elkina 1,2 * Mikhail Kurushkin 2 Orvin's luminous markers are designed and guaranteed to far outlive the life of every Orvin diver's timepiece. It will noticeably glow radiantly and help maintain its luminescence for a more extended period.Īmong a handful of other advanced features, Orvin’s high-quality utilitarian tool watches spotlight this luminescent aspect as a priority in producing diver's watches. You need to direct the light to the timepiece for a few seconds. One way to extend the life of the luminous feature of your watch is by using a UV flashlight. Therefore, it's imperative to give your diver's watch the care and maintenance it deserves. This is especially true in the dark depths of the ocean. The primary purpose of luminous dials and lume markers/hands is to make them readable even in dim light conditions. Once the light contacts the phosphorescent material, the electrons get ignited and start charging quickly. It must be initially 'charged' through light exposure for the material to glow. Though natural light is known to charge the luminescence, reports claim sunlight offers the best effect. Swiss company RC Tritec claims that Super-LumiNova works like a light storage battery. The word 'super' implies that it is entirely Swiss-made. LumiNova is under the registered name of Super-LumiNova. The former hue was found to glow the brightest, while the latter was renowned for glowing the longest. LumiNova is around 10 times brighter than standard luminescence and comes with color variations between bright green and bright blue. Not to mention, it is also resistant to temperature and environmental factors. This marked the existence of LumiNova.Ī non-hazardous phosphor, it doesn't decay during the timepiece's lifetime. After the Hiroshima and Nagasaki bombing in 1945, the Japanese businessman thought about developing a novel non-radioactive luminescent material. Kenzo Nemoto started selling luminous paint in 1941. This was when the Swiss watchmaker switched to LumiNova. ![]() However, tritium paint was banned in 1998. Rolex was among those watch brands that utilized tritium through the years. ![]() Though it was a safer substitute for radium, it was classified as a low-energy beta-emitter. Then, watchmakers resorted to tritium, which was used until the mid-1990s. However, it only had two and a half years of half-life. This was a less risky alternative to radium, as it only emits beta particles. Hence, watchmakers opted for safer materials.Ī few years later, promethium came into the picture. However, the catch is that it's radioactive. What's astonishing about radium is that it can glow for more than 1,600 years, approximately the half-life of the material wherein the luminescence starts to dim. And until the 1960s, timepieces were using radium as lume. Let's discover how they came to be and how they work. If you are fond of luminous watches, you might have probably wondered about the science behind them. Thus, it is not surprising that even timepieces have this amazing feature. Humans have a natural inclination to things that glow and sparkle.
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