Hui, you may want to check this page:
http://wiki.answers.com/Q/What_is_the_relationship_between_sievert_and_becquerel
Your English is much better than my Chinese, you are doing great, don't be
embarrassed!
Didier
On Wed, Jul 10, 2013 at 8:53 AM, Hui Zhang wrote:
> Hello Robert:
>
> I am a l
Hi,
Not quite, The raduim is still very active. The glow stops because the ZnS
breaks down. The light emissson relies on the crystaline structure of the ZnS
plus a small amount of doping, typically silver. The alpha particles break down
the crytaline structrure causing the glow to weaken. Most
Eric:
http://tf.nist.gov/general/pdf/1133.pdf
discusses the noise levels of various batteries.
Regards
Mark S
Message: 6
Date: Wed, 10 Jul 2013 11:11:00 -0700
From: Eric Williams
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Lead acid battery no
On Wed, Jul 10, 2013 at 07:40:50PM -0400, David I. Emery wrote:
>
> But if the satellite radiates what a local GPS package would and
> transmits ephmerides defining its position and motion it could be
> included in a GPS solution and could be used for timing and frequency
> purposes the sam
On 7/10/13 12:29 PM, Didier Juges wrote:
Jim said:
"It's like a HP 8663B (not the modern Agilent E8663).. very low noise,"
The Agilent E8663 has similar SSB phase noise spec as the older HP 8662A
(-144dBc/Hz @ 10 kHz with option UNY, versus -143 for the 8662). You seem
to imply they are differe
On 7/10/13 2:15 PM, Max Robinson wrote:
I think that luminous dial watches still contain a little tritium to
keep them glowing for many hours after the atoms that were excited by
visible photons have all decayed. Without the tritium the glow would
completely go dark after most of the atoms have
On Wed, Jul 10, 2013 at 07:45:39PM -0400, Bob Camp wrote:
> Hi
>
> If the WAAS birds are run in a fashion that gives a true GPS payload
> performance, why not assign them a SN 32 or below and use them?
>
> If the WAAS birds are not in the "right numbers", why bother to set them up
> and spend
Thanks, Robert, for this detailed information.
Volker
Am 10.07.2013 21:01, schrieb Robert Atkinson:
Hi Hui,
This is a little off-topic for time nuts, but here goes. the
Becquerel is a measurement of radioactivity, 1Bq being one decay per
second. Bg/gm is specific activity so if you have 1g of m
On 07/11/2013 01:45 AM, Bob Camp wrote:
Hi
If the WAAS birds are run in a fashion that gives a true GPS payload
performance, why not assign them a SN 32 or below and use them?
If the WAAS birds are not in the "right numbers", why bother to set them up and
spend the bucks to make them behave
Hi
If the WAAS birds are run in a fashion that gives a true GPS payload
performance, why not assign them a SN 32 or below and use them?
If the WAAS birds are not in the "right numbers", why bother to set them up and
spend the bucks to make them behave like a nav sat? What's the payoff?
Bob
On Wed, Jul 10, 2013 at 02:42:19PM -0700, J. Forster wrote:
> David,
>
> While I can easily see how you can do closed loop correctioin for Dopplar
> from the transmission point for a 'bent pipe' repeater, at any other
> location that correction would not be valid, because the paths are not
> paral
This isotope of radium has a half-life of 1600 years. It isn't dead, or
even noticeably less radioactive.
Most probably it has burned out the binder that holds the ZnS:Cu material
together and on the digits and hands.
-Chuck Harris
Bill Hawkins wrote:
Since this thread doesn't appear to have
Jim said:
"It's like a HP 8663B (not the modern Agilent E8663).. very low noise,"
The Agilent E8663 has similar SSB phase noise spec as the older HP 8662A
(-144dBc/Hz @ 10 kHz with option UNY, versus -143 for the 8662). You seem
to imply they are different. Can you elaborate?
Of course, the Agil
Since this thread doesn't appear to have a half-life, perhaps this needs
some explanation.
The zinc sulfide fluoresces when an atom or more of radium decays. The
fluorescence will still occur in the presence of ionizing radiation. The
radium, OTOH, is nearly dead. Probability says that some number
I wonder if lithium batteries would have a good noise figure. The
nano-structure of the electrodes give them very large surface area and low
resistance, but the charge carriers are different than other types of
chemistry and I don't know if that's good or bad.
On Wed, Jul 10, 2013 at 9:01 AM, Ha
The dial is painted, the hands are actually metal frame, and the
luminous paint is a wax that is put on the hand kind of like a
soap bubble.
The luminous material in the paint is very dead, as the hands and
digits no longer glow at all. I guess there is a limit to how long
ZnS:Cu can take the ex
Hi
On Jul 10, 2013, at 5:08 PM, David I. Emery wrote:
> On Wed, Jul 10, 2013 at 08:10:45PM +0200, Magnus Danielson wrote:
>> On 07/09/2013 04:25 AM, Joseph Gwinn wrote:
>>> Yes, of course, but I don't think I explained very well. The issue was
>>> more economic than technical.
>>>
>>> There i
The stuff that turns color is the dial paint. The numbers are painted on
top. When the hands move, they expose the underlying paint to view.
-John
=
> I wonder what that is? How come the digits don't show the same burn that
> the
> hands do? They certainly remained in the same positi
David,
While I can easily see how you can do closed loop correctioin for Dopplar
from the transmission point for a 'bent pipe' repeater, at any other
location that correction would not be valid, because the paths are not
parallel.
-John
=
> On Wed, Jul 10, 2013 at 08:10:45PM +0200,
On 07/10/2013 11:08 PM, David I. Emery wrote:
On Wed, Jul 10, 2013 at 08:10:45PM +0200, Magnus Danielson wrote:
On 07/09/2013 04:25 AM, Joseph Gwinn wrote:
Yes, of course, but I don't think I explained very well. The issue was
more economic than technical.
There isn't much spare space, weight
I wonder what that is? How come the digits don't show the same burn that the
hands do? They certainly remained in the same position for longer than the
hands.
Hmmm?
Tom
- Original Message -
From: "Chuck Harris"
To: "Discussion of precise time and frequency measurement"
Sent: Wedn
I think that luminous dial watches still contain a little tritium to keep
them glowing for many hours after the atoms that were excited by visible
photons have all decayed. Without the tritium the glow would completely go
dark after most of the atoms have decayed to their ground state.
Regard
On Wed, Jul 10, 2013 at 08:10:45PM +0200, Magnus Danielson wrote:
> On 07/09/2013 04:25 AM, Joseph Gwinn wrote:
> >Yes, of course, but I don't think I explained very well. The issue was
> >more economic than technical.
> >
> >There isn't much spare space, weight, or power in the birds, technology
I have two chokerings on my roof. Get something to mount a TV antenna or a
small satellite dish. Use a threaded water pipe instead of the normal antenna
mast.
If this is the oem version from Aeroantenna (AT575-90), there are also 3 bolt
holes around the outer rim. Given a flat surface its prett
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I just scored a Leica L1 GPS choke ring antenna.
Of course I am anxious to get it up (pardon the pun) Sorry tom ;)
But its huge, I mean its 14" across the base and 12" high excluding the spike.
It came with a ½" and ¾" adaptor so I can choose mounting pole thread.
Obviously, the top of the roof
Please relax Rb is rubidium. It has a large number of isotopes but almost all
rubidium is either stable (AW=85), or an isotope that is a beta (ie. electron)
emitter. Electrons generally don't travel too far. Rubidium is used in
fireworks (Ok guys who make fireworks are maybe a bit overly brav
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Hi Hui,
This is a little off-topic for time nuts, but here goes. the
Becquerel is a measurement of radioactivity, 1Bq being one decay per
second. Bg/gm is specific activity so if you have 1g of material with a
specific activity of 200Bq/g you will have 200 decays per second. We
need to use thi
We use an Agilent 8644B where I work as the master oscillator for an
electron cyclotron storage ring. Electrons at 2GeV don't like to be pushed
around and are very sensitive to phase noise, so the feedback loop that
adjusts the frequency uses the FM input for fine adjustment.
--
eric
On Wed, Jul
On 07/09/2013 04:25 AM, Joseph Gwinn wrote:
Yes, of course, but I don't think I explained very well. The issue was
more economic than technical.
There isn't much spare space, weight, or power in the birds, technology
moves rapidly, and the satellite companies don't want to have expensive
satell
My last two wrist watches (I know, that makes me an anachronism on this
list) both have hands that glow in the dark, but I assume it is the result
of absorbing photons for later release, not some radioactive source.
Am I wrong?
Tom Holmes, N8ZM
Tipp City, OH
EM79
> -Original Message-
>
Tritium is very different from radium. I'm a little out of my field of
expertise here but I think that tritium is mainly a beta source while radium
is a gamma emitter. Also the body can get rid of tritium if ingested
because it is chemically similar to hydrogen. I'm sure I will be corrected
We had a Lab in Bldg 6 at MIT (Physics Dept.) that had an old Soapstone
sink in it. I remember talking to an Old-Timer (now this was in the early
60's) who told me that sink was used to clean the bones of deceased
Watch Company workers. They were then tested for Radioactivity levels.
It was a lon
On 7/10/2013 11:35 AM, time-nuts-requ...@febo.com wrote:
> Public perceptions of risk change with time.
>
> In WWII, Radium dial watches, aircraft instruments, dial and switch
> markings, were ubiquitous. But so were explosives, bombs, bayonettes, and
> a bunch of other things. So people didn't
In message <5DEED07BE9DE486C9E668636A2949A62@BACKROOM>, "Max Robinson" writes:
>I once read that if you were to wear a radium dial watch face down you would
>get a radiation burn on your arm. I wonder who would do such a thing. I
>also wonder if the writer knew what he was writing about or if
I once read that if you were to wear a radium dial watch face down you would
get a radiation burn on your arm. I wonder who would do such a thing. I
also wonder if the writer knew what he was writing about or if he was just
speculating.
Regards.
Max. K 4 O DS.
Email: m...@maxsmusicplace.c
I follow a BBC news site and this article popped up to bring us back on topic.
Hope it's not old news
http://www.bbc.co.uk/news/science-environment-23231206
Bob - AE6RV
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In brief,
Gamma rays are just another form of light... that is to say photons. What makes
them special is they are much higher energy than visible light. What makes them
potentially dangerous is they have enough energy to knock electrons off of many
atoms, turning them into ions that could comb
I wonder if that would be possible? I bet the government paperwork would
make the watches costs far out of reach for most people.
Tom
WA3PZI
- Original Message -
From: "Bob Stewart"
To: "Discussion of precise time and frequency measurement"
Sent: Wednesday, July 10, 2013 11:25 AM
S
Consider this thread finished. I am taking it up with the individuals involved,
off-line.
Please do you part to keep all postings, and especially all replies, technical,
friendly, and on-topic.
If there's something about the list, please email me directly.
Thanks,
/tvb
http://www.leapsecond.c
I think I pretty much agree with Perry. This list has occasionally gone
quite aways OT, but it invariably finds its way back, and certainly more
than quickly enough. However, a mother replacement does absolutely
nothing to speed up the process, least of all a sanctimonious,
holier-than-thou one.
Perrier
You are out of line Charles is right on, this list has deteriorated that
many of us are now off list conducting time nuts business, the looser is the
list which has deteriorated in to a chat room and 90%+ messages are
deleted because they are irrelevant, off subject or BS.
Who ever is
The watch workers were a tragedy, based on ignorance of the risks. At the
time, there were probably only a handful of people who'd ever sustained
injury from radioactive materials. It's not clear that the bosses even
knew the women were putting the brushes in their mouths or that they knew
the risk
a...@bardagjy.com said:
> The SRS 560 and 570, low noise voltage and current preamplifiers
> respectively, both use bog standard sealed lead acid batteries.
Is that to reduce power supply noise or to get a clean ground that isn't
connected to wall power?
--
These are my opinions. I hate spa
Charles wrote: Please keep your political comments
to yourself and off the list (however humorous you might think they are). This
is simply not the place for them.
Charles,
On the two lists we both subscribe to, you always
seem to have something to say about almost every post. Often it fa
You're still here, but what about the young women who painted those watches who
aren't? The problem was that they needed sharp points on the brushes to fill
the tiny voids in the hands. So they twirled the brush tips between their
lips. They could probably bring back radium dials today with n
Public perceptions of risk change with time.
In WWII, Radium dial watches, aircraft instruments, dial and switch
markings, were ubiquitous. But so were explosives, bombs, bayonettes, and
a bunch of other things. So people didn't have the luxury of concerns over
minor things.
Now that is not so.
I just tried calling your cell because you seem to be the "legitimate"
person to ask. I don't read all the time-nuts postings but has anyone ever
brought up the most logical aspect of ionizing radiation for the group: the
radium dial wrist watch? or are they all too young to have experienced t
Hello Robert:
I am a little confuse how exactly much Rb87 in a bulb? Some people say that
it's couple millgram, but you tell me it's half a millgram, which is ture?
You message is good new to me, it let me relax, but I don’t understand Bq/gram
unit, would you please convert it to mSV unit, I c
Hello Charles:
Don't worry about it, my brain auto ignore any comments of technology
irrelevant.
Hui
At 2013-07-10 13:58:47,"Charles P. Steinmetz"
wrote:
>Perrier wrote:
>
>>You have absolutely NOTHING to fear. Here is why
>
>Please keep your political comments to yourself and off the l
You must really be a "legend in your own mind", and now, a self-proclaimed
"time-nuts" cop. -
Mike B. Feher, EOZ Inc.
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960 office
908-902-3831 cell
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behal
Hi
Having hooked up a 9854 and tried it with realistic settings - it's not that
great. If you run it at "magic" frequencies (where it's essentially just a
divider) it looks like a divider.
Bob
On Jul 9, 2013, at 5:03 AM, Anders Time wrote:
> Thanks a lot for the input.
> I have been looking
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