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12 May 2017, 02:01 AM
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#1 |
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"TRF" Member
Join Date: Apr 2017
Location: USA
Posts: 132
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Half-life of Tritium vs. brightness
The half-life of Tritiam is 12.3 yrs. Tritium is a beta emitter which means it emits an electron in its decay process. Does anyone know how the number of half-lives relates to brightness? In other words after 12.3 yrs is it still luminous but half as bright as original? 24.6 yrs one fourth as bright? Etc.
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12 May 2017, 02:03 AM
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#2 |
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"TRF" Member
Join Date: Dec 2013
Location: FL
Watch: platinum sub
Posts: 15,884
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12.5 years.
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If you wind it, they will run. 25 or 6 to 4. |
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12 May 2017, 02:08 AM
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#3 |
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"TRF" Member
Join Date: Dec 2012
Location: Canada
Posts: 1,027
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I have a GMT that is 31 years old. In the middle of the night when your eyes are adjusted to the pitch black darkness you can just barely see the tritium still glowing.
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RCN (Canadian) Tudor Milsub database co-manager |
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12 May 2017, 02:12 AM
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#4 |
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"TRF" Member
Join Date: Jun 2015
Real Name: Mark
Location: Washington State
Watch: SUBS and GMT's!
Posts: 9,664
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My 1966 gilt Sub still has some glow after light exposure, but it only last for a few seconds. I think this is fairly common with the mid 60's models.
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Judge Smails: Ty, what did you shoot today? Ty: Oh, Judge, I don't keep score. Judge Smails: Then how do you measure yourself with other golfers? Ty: By height. |
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12 May 2017, 02:16 AM
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#5 |
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2024 Pledge Member
Join Date: Jan 2013
Location: USA
Posts: 6,187
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My 1990 gmt has zero glow
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12 May 2017, 02:52 AM
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#6 |
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2024 ROLEX DATEJUST41 Pledge Member
Join Date: Nov 2007
Real Name: Joe
Location: New Mexico
Watch: Explorer
Posts: 12,753
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Rolex lume has always been, and will always be terrible. My Luminova dial is neither here nor there and the Super Luminova dial on my GMT2C was okay-ish
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It's Espresso, not Expresso. Coffee is not a train in Italy. -TRF Member 6982- |
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12 May 2017, 02:54 AM
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#7 | |
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"TRF" Member
Join Date: Dec 2013
Location: FL
Watch: platinum sub
Posts: 15,884
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Quote:
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If you wind it, they will run. 25 or 6 to 4. |
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12 May 2017, 03:10 AM
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#8 |
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"TRF" Member
Join Date: Apr 2016
Real Name: Doug
Location: Georgia USA
Watch: Rolex President
Posts: 1,348
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I have a Luminox watch, tritium tubes, that is about 15 years old. It's my night watch. The lume is perfectly readable. I'm sure that the lume isn't as bright as when new, but it's far better than my 1 year old Rolex GMT.
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12 May 2017, 03:26 AM
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#9 |
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"TRF" Member
Join Date: Apr 2009
Location: gy norfolk uk
Posts: 159
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I agree about Tudor lume, I have a 1980 sub and the lume is still just visible after a couple of hours, but the lume on my 1yr old GMTc lasts no more then an hour before you struggle to see it.
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12 May 2017, 03:34 AM
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#10 | |
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TRF Moderator & 2024 DATE-JUST41 Patron
Join Date: May 2007
Real Name: Larry
Location: Mojave Desert
Watch: GMT's
Posts: 43,049
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Quote:
Half-life pertains to the emitted radiation, as you have said. It is not that emission that is the brightness (tritium has no glow properties by itself), it is the paint matrix that is excited by the radiation that glows. So, when the tritium has decayed to half it's emission life, or more, it may not have enough power to excite the paint matrix much at all. The "brightness" does not have a linear correlation to the tritium half-life. 
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(Chill ... It's just a watch Forum.....) NAWCC Member |
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12 May 2017, 03:48 AM
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#11 |
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"TRF" Member
Join Date: Apr 2017
Location: USA
Posts: 132
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The electrons emitted have the same energy, there are just fewer of them
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