An underline on your dial stands for Tritium!

Vintage Rolex Discussion
Joined: July 30th, 2008, 1:59 pm

February 8th, 2009, 7:35 pm #11

The caseback does absorb some radiation in addition because of its much higher atomar density.
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Joined: March 2nd, 2008, 2:18 pm

February 8th, 2009, 7:41 pm #12

Thanks to Bas.nl for the scientific use of a Geiger meter to date a dial correctly.

"I have measured with my Geiger counter more than 10 Rolex watches with a underline.
All of them had swiss on the dial, and there was no radiation!

When you measured a normal swiss dial (no underline) they are radioactive.
They give a radiation of 1 til 30 microSw/h "

From the earlier results we measure together...
5512...


6542...


6538...


To your studie on the messuared underlines you have had, gives me the decisive...It all makes sense to me, finally i can agree on the definitaion of underline stands for tritium.
The Typo difference and print colour that have been used on underline dials...& using White Swiss, Gold swiss etc...

an underline on your dial stands for Tritium, and was used around '62-'63, simpel :- )



Cool we are making progress here....like it!

Rgrds.P


Err...opt for safer "Tritium" or "Luminova" Dialed watches...
instead.

"Tritium" has a half life decay on average 12.32 years or so...
n perhaps those "Tritium" watches produced last in 1998...
might still emit radioactivity...tipping the scale slightly...

Then the RARER "underline" Gilt Dialed watches...being the 1st of its
kind marking the use of "Tritium" on watches...would topple
the scale of resale market price indexes...follow closely
by the watches that have Gilt plots with "Tritium" on Dials...

Err...any chance of seeing someone selling Gilt Radium Dialed watches...
cheaper...?

Heheh...

Best regards
Orchi.
Last edited by orchi on February 8th, 2009, 7:51 pm, edited 1 time in total.
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Joined: September 2nd, 2007, 11:37 am

February 8th, 2009, 8:40 pm #13

from Philipps measurements 5 Mikrosievert per hour
it's easy to calculate a radiation dose of ca. 45 Millisievert per year (mSv/a)

This means more than 1oo times the intensity of the average cosmic radiation dose (0,3 mSv/a)

the NATURAL ENVIRONMENTAL RADIOACTIVITY (cosmic, terrestric, Inhalation and Ingestion of nuclids)
messures around 2 mSievert/year.

Profesionals (e.g. working in an hospital X-ray departement) in the EU are not allowed to exceed 20 mSv/a.

the radiation dose of an standard X-ray is around 0,04 mSv
of a standard CT-scan (Thorax) around 8 Sv.

the half life ratio for the different Radium subtypes (nuclids) range up to 1602 years
for Radium 226 (which is supposed to be the used type for luminate purposes )

But: the topic is much more complicated. It can not be described with some numbers.

Best protection is: DISTANCE

Imho:
Rolex did not undertake big efforts and an expensive recall programm for dial excahnge to have
satiesfied some green weirdos.
The issue was probably well discussed with all appropriate Earnestness and edequate action was taken.
Hi,

Thanks for the line up. I posted a similar topic a while ago and I agree it is a most underestimated topic....... ! But the main problem is that the topic is far more complicated when quoting dangers of wearing these beauties... Working with the dial full of radium in an unprotected area is another underestimated subject btw....

Lot to write about...

cheers,
Mark
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Joined: September 2nd, 2007, 11:37 am

February 8th, 2009, 8:44 pm #14

Err...opt for safer "Tritium" or "Luminova" Dialed watches...
instead.

"Tritium" has a half life decay on average 12.32 years or so...
n perhaps those "Tritium" watches produced last in 1998...
might still emit radioactivity...tipping the scale slightly...

Then the RARER "underline" Gilt Dialed watches...being the 1st of its
kind marking the use of "Tritium" on watches...would topple
the scale of resale market price indexes...follow closely
by the watches that have Gilt plots with "Tritium" on Dials...

Err...any chance of seeing someone selling Gilt Radium Dialed watches...
cheaper...?

Heheh...

Best regards
Orchi.
...Thought about the same thing... BUT there is a difference between wearing those or working on the dials (watchmakers)... and besides...even those risks are extremely difficult to define as there are lots of factors to take into account.

Solution could be to find the nicest t < 25 dial you can find (for the 5508 f.i. a gilt version does exist, and swap dials....keep the swiss one somewhere safe.<br>
But then again.....most of those swiss dials are just soooooo nice...

cheers,
Mark
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Joined: October 16th, 2006, 7:51 am

February 8th, 2009, 11:17 pm #15

Thanks to Bas.nl for the scientific use of a Geiger meter to date a dial correctly.

"I have measured with my Geiger counter more than 10 Rolex watches with a underline.
All of them had swiss on the dial, and there was no radiation!

When you measured a normal swiss dial (no underline) they are radioactive.
They give a radiation of 1 til 30 microSw/h "

From the earlier results we measure together...
5512...


6542...


6538...


To your studie on the messuared underlines you have had, gives me the decisive...It all makes sense to me, finally i can agree on the definitaion of underline stands for tritium.
The Typo difference and print colour that have been used on underline dials...& using White Swiss, Gold swiss etc...

an underline on your dial stands for Tritium, and was used around '62-'63, simpel :- )



Cool we are making progress here....like it!

Rgrds.P


My '61er 1675 underliner is full of Radium and still radioactive (over 3). That was discovered by the same Bas a few months ago- he must have forgottend that. I visited him and he told me then that all underliners he has examend had Tritium on it. We/he examend the dial and yellow gold hands closely and came to the conclusion that the Radium was original and still dangerous glowing.



cheers



Rob



Last edited by Snorlex on February 8th, 2009, 11:21 pm, edited 1 time in total.
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Joined: October 4th, 2006, 9:33 pm

February 8th, 2009, 11:41 pm #16

I think i know your watch, wasn't that the one i initially bought some 3 years ago but on some kind of missing brotherhood i didn't got the chance to pay your friend and it ended up with you?

As you say yourself, the hands are yellow gold and not matching to the dial, probably changed later, as the bezel... so it interest me how the underline looks closely on your dial...would love to see some macro scans if you can.

Interest and worthwhile investigating! next time you're in Maastricht, please bring it with you and come for a espresso.

regards Philipp
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Joined: July 29th, 2007, 6:00 pm

February 9th, 2009, 12:13 am #17

My '61er 1675 underliner is full of Radium and still radioactive (over 3). That was discovered by the same Bas a few months ago- he must have forgottend that. I visited him and he told me then that all underliners he has examend had Tritium on it. We/he examend the dial and yellow gold hands closely and came to the conclusion that the Radium was original and still dangerous glowing.



cheers



Rob



Maybe dial has radium, but maybe it does have tritium and the geiger meter might be reading radium on the hands.

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Joined: March 2nd, 2008, 2:18 pm

February 9th, 2009, 1:58 am #18

Best regards
Orchi.
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Joined: March 2nd, 2008, 2:18 pm

February 9th, 2009, 2:31 am #19

My '61er 1675 underliner is full of Radium and still radioactive (over 3). That was discovered by the same Bas a few months ago- he must have forgottend that. I visited him and he told me then that all underliners he has examend had Tritium on it. We/he examend the dial and yellow gold hands closely and came to the conclusion that the Radium was original and still dangerous glowing.



cheers



Rob



Err...easily in oxidation when exposed to AIR...

In its pure radioactive chemical element...Radium
is PURE WHITE...having a half-life decay of 1,602 years.

Radium was primarily used to make indicators & switches
to be luminous...such as Dials on watches...
aircraft instruments & etc...

It ceased to be used in later part of 1950s...due
to its DEADLY hazardous properties...

More than 100 ladies(dubbed as the Radium Girl)...
died subsequently due to exposure to Radium...when they worked
as Dial Painter for US Radium Corp back in the
1930s...

http://en.wikipedia.org/wiki/Radium_Girls

Best regards
Orchi.
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