Hej, skal lige starte med, at skrive, at Jeg IKKE er fysiker
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Men halveringstid er halveringstid
og Wikipedia er din ven
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” I fysik er halveringstiden et statistisk mål for hvor længe atomkerner af en ustabil isotop kan eksistere før de henfalder. Betragter man et antal identiske atomkerner, vil halvdelen af kernerne være henfaldet efter én halveringstid. Efter endnu en halveringstid er der halvdelen af halvdelen dvs. en fjerdedel af de oprindelige kerner tilbage og så videre.”(se klide)
[url]"http://da.wikipedia.org/wiki/Halveringstid#Fysisk_halveringstid" o
nclick="window.open(this.href);return false;">http://da.wikipedia.org/wiki/Halverings ... veringstid[/url]
Det er ikke Tritiumen, som lyser. Men Fosfor. Her et eks. Med varebetegnelsen ”luminox”, hvor det er i et lukket rør. (og dermed bedre beskyttet).
”The tritium in a gaseous tritium light source undergoes beta decay, releasing electrons which cause the phosphor layer to fluoresce. During manufacture, a length of borosilicate glass tube which has had the inside surface coated with a phosphor-containing compound is filled with the radioactive tritium. The tube is then fused with a CO2 laser at the desired length. Borosilicate is used for its strength and resistance to breakage. In the tube, the tritium gives off a steady stream of electrons due to beta decay. These particles excite the phosphor, causing it to emit a low, steady glow. One could use any beta particle-emitting substance, but in practice tritium is preferred because it is not very hazardous.”(se kilde)
[url]"http://en.wikipedia.org/wiki/Luminox#Always_Visible_Technology" o
nclick="window.open(this.href);return false;">http://en.wikipedia.org/wiki/Luminox#Al ... Technology[/url]
” The emitted electrons from small amounts of tritium cause phosphors to glow so as to make self-powered lighting devices called betalights, which are now used in watches (See Luminox for example), exit signs, map lights, and a variety of other devices. This takes the place of radium, which can cause bone cancer and has been banned in most countries for decades.”(se kilde)
[url]"http://en.wikipedia.org/wiki/Tritium#Self-powered_lighting" o
nclick="window.open(this.href);return false;">http://en.wikipedia.org/wiki/Tritium#Se ... d_lighting[/url]
De nyere skiver, hos fx rolex. Er ikke med Tritium, men ”superluminova” og lyser derfor ikke heletiden, men kun når fosforen og hvad de nu ellers blander i, pirres / påvirkes af elektroner ”udefra” fx lys el. et magnetfelt.
” This type of phosphorescent pigments, often called lume, operate like a light battery. After sufficient activation by sunlight or artificial light, they glow in the dark for hours. Larger markings are visible for the whole night. This activation and subsequent light emission process can be repeated again and again, and the material does not suffer any practical aging. Strontium aluminate based pigments have to be protected against coming into contact with water or moisture, since this degrades the light emitting quality[1][2][3].”(se kilde)
[url]"http://en.wikipedia.org/wiki/Super-LumiNova" o
nclick="window.open(this.href);return false;">http://en.wikipedia.org/wiki/Super-LumiNova[/url]
Forklaringen, er måske her
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Hvis din skive er af nyere dato, (du skriver 97), så må dit ur være med Super-LumiNova.
”Strontium aluminate based pigments have to be protected against coming into contact with water or moisture, since this degrades the light emitting quality[1][2][3].”(se kilde).
Det ville kunne forklare, hvorfor ure med Super-LumiNova af fx samme alder lyser forskelligt. Ellers burde der ikke være forskel på ure, nye som gamle, hvis de er med Super-LumiNova. Da ” the material does not suffer any practical aging.”
Har du en tritium-skive (swiss-T ..)på dit Rolex, er den næsten min. 25år gammel. Dvs. 2 gange halveringstid for tritiumén. Altså det halve, af det halve, = ikke meget ”stråling” tilbage og dermed ikke meget pirring af fosforen, som igen giver mindre lys.
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