(Login philippstahl) VRF Contributing Member from IP address 22.214.171.124
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...
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 :- )
P, as i wrote yesterday to Bas.nl and to buddy Orchi, this could be a good input in the study of the Underlines.
maybe all the Underlined have Tritium and not Rarium in the dial.
maybe before the use of "T<25" print they used to print the Underline.
so all the Underlined in the very old reference could be very early Service dials, or just dials in which Rolex changed the Radium with the Tritium before to sell them.
it can make sense.
just two things.
why to use Underline + T SWISS T in this dial ?
concerning some very old reference with the Underline.
is it possible that we payied lot of money for some early Service dials ??
some dials which had the radium removed and placed tritium instead.
I think T swiss T dials also belong to a not very clear transition (I mean transition from radium to tritium) and if at that time they were using underlines to flag tritium dials marked swiss, wouldn't be strange they also did the print "-" on other t swiss t dials they had at the moment being produced, only to make sure non radioactive content was on the dial. This was not a minor issue, just figure out at that time what could possibly mean to a brand: Rolex sells watches with radioactive material. They had to wipe that off for good. A watchmaker can get his store closed if he is caught handling this, today, just imagine at that time.
Roberto, we pay crazy sums for Gilt service dials for 6538s, so we are already in the ball, lets dance.
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
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.
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....
(Login orchi) VRF Contributing Member 126.96.36.199
So perhaps..it's time to get rid of the hazardous "Radium" Dialed watches..&(+)
February 8 2009, 11:41 AM
Err...opt for safer "Tritium" or "Luminova" Dialed watches...
"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...
...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.
But then again.....most of those swiss dials are just soooooo nice...
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.
Interesting Rob!...can you make us a close up of the Underline?
February 8 2009, 3:41 PM
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.