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Post by dapellegrini on Jan 29, 2024 13:29:14 GMT -8
Anyone know what kind of measurement is to be expected by Radium lume in uSv/h or CPM?
Geiger counter in hand, and the Silverwaves with black bezels definitely register, as does a Citizen Alarm, Citizen Uni Diver, and surprising to me a couple of the 1967 Seiko world timers with just lumed hands....
EDIT: The 21j 4006-7029 is also very hot.... From March 68.
Most of the stuff that is registering as HOT is showing between 2-4 uSv/h. A couple though are well over 10 uSv/h.
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Post by dapellegrini on Apr 5, 2024 15:33:50 GMT -8
As I suspected this 4006-7019, very rare and desirable US model bell-matic from Oct 1967 is hot. Seems to swing between 3-5 uSv/h  |
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Post by dapellegrini on Apr 5, 2024 16:00:13 GMT -8
Here's that 4006-7019:  |
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Post by dapellegrini on Apr 5, 2024 16:08:22 GMT -8
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Post by dapellegrini on Apr 5, 2024 16:13:22 GMT -8
For reference, background at my place is 0.12 uSv/h
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inboost
WS Benefactor
Constantly Rodicoing
Posts: 4,272
Member is Online
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Post by inboost on Apr 6, 2024 7:56:32 GMT -8
dapellegrini, that 4006-7029 from March 1968 is such an outlier in the group at 10x the others I wonder if it's not radioactive from other sources? Perhaps it belonged to someone working in a higher background radioactive field like an x-ray technician from the day or a nuclear power plant facility? I don't know if you are up for it or not, but un-caseing the movement and pulling the hands / dial and then testing the case/bracelet , movement, and dial+hands separately might give some interesting results!
Boy are those Silverwave watches are breathtaking, I really like the ones with the spoked dials! You need a transparent case you can sink in an aquarium to display them so the radiation isn't a worry to you and we can still see them. Water is a great shield - most radioactive materials are stored in pools of water for safety reasons.
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trilo
WS Benefactor
Posts: 2,009
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Post by trilo on Apr 6, 2024 9:08:10 GMT -8
dapellegrini , that 4006-7029 from March 1968 is such an outlier in the group at 10x the others I wonder if it's not radioactive from other sources? Perhaps it belonged to someone working in a higher background radioactive field like an x-ray technician from the day or a nuclear power plant facility? I don't know if you are up for it or not, but un-caseing the movement and pulling the hands / dial and then testing the case/bracelet , movement, and dial+hands separately might give some interesting results!
Boy are those Silverwave watches are breathtaking, I really like the ones with the spoked dials! You need a transparent case you can sink in an aquarium to display them so the radiation isn't a worry to you and we can still see them. Water is a great shield - most radioactive materials are stored in pools of water for safety reasons.
Honey... Yes dear? Ummm... I need to buy a water tank for my watch... What, why? Erm... I'm afraid it's radio active, like really radio active. WHAT?! You got to be kidding me! Yes, but honey the dia... *%&?€!!!!* |
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DanS
WS Benefactor
Posts: 333
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Post by DanS on Apr 6, 2024 9:08:25 GMT -8
Boy are those Silverwave watches are breathtaking, I really like the ones with the spoked dials!
Great dials ... as long as you're not trying to read the time. ;-) |
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Post by dapellegrini on Apr 6, 2024 9:42:39 GMT -8
I suspect the 4006-7029 just has a lot more luminous material on it, but can't prove that until I source another one, or get my GC to someone who can check theirs. I also suspect that the Daini 62MAS and the 6105-8x09's with radium lume will produce similar or higher numbers. I wonder which other Seikos and Citizens use Radium? ... The color is pretty distinctive on the Seikos at least.
For my world timers, I've sourced the same hands without the radium... should be an easy job, and they've got no lume on the dial, so hopefully that will resolve those.
I know it is commonly said that radium is much ado about nothing unless you are licking the dial... but:
1) I do open up and work on my watches
2) Common hearsay is that Seiko and Citizen didn't use Radium, clearly not true
3) I did have several of these open to brush any debris from the dials, replace crystals etc, and was horrified to learn these were radium. I certainly would have taken a few more precautions with the same tasks if I had known.
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GuyJ
Needs a Life!
Whitley Bay, UK
Posts: 2,862 
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Post by GuyJ on Apr 13, 2024 8:05:52 GMT -8
I've sorted 3 radium 6105 and 6117 in total. Cleaned the handset on my daini. I since sold them and won't work on them any more. May be overly cautious, but I see no point. I do find seiko's lack of transparency with regards their lume material, especially when the famous question was asked and all was admitted to was pm147, a bit disappointing and quite concerning. The 4006 is crazy.. I suspect the 4006-7029 just has a lot more luminous material on it, but can't prove that until I source another one, or get my GC to someone who can check theirs. I also suspect that the Daini 62MAS and the 6105-8x09's with radium lume will produce similar or higher numbers. I wonder which other Seikos and Citizens us Radium? ... The color is pretty distinctive on the Seikos at least. For my world timers, I've sourced the same hands without the radium... should be an easy job, and they've got no lume on the dial, so hopefully that will resolve those. I know it is commonly said that radium is much ado about nothing unless you are licking the dial... but: 1) I do open up and work on my watches 2) Common hearsay is that Seiko and Citizen didn't use Radium, clearly not true 3) I did have several of these open to brush any debris from the dials, replace crystals etc, and was horrified to learn these were radium. I certainly would have taken a few more precautions with the same tasks if I had known. |
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