[neonixie-l] Re: Video with nixies display in old secret place

[Paul Andrews]

That would be B-5*0*92-A.

On Thursday, April 27, 2017 at 9:55:54 PM UTC-4, Paul Andrews wrote:
>
> While I was searching for information on 122P224 tubes (aka B-5992-A), I 
> came across a document in our very own document repository here 
> . I 
> transferred all the info into the shared spreadsheet, I added four more 
> entries and I arranged everything by alphabetical order.
>
> It would be good if people could add dates to most of them!
>

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[neonixie-l] Re: Video with nixies display in old secret place

[Paul Andrews]

While I was searching for information on 122P224 tubes (aka B-5992-A), I 
came across a document in our very own document repository here 
. I 
transferred all the info into the shared spreadsheet, I added four more 
entries and I arranged everything by alphabetical order.

It would be good if people could add dates to most of them!

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[neonixie-l] Re: Radioactive Nixies - Study

[Paul Andrews]

Just got my radioactive nixie tubes. Sadly they seem to make my geiger 
counter  read less 
than normal!




On Sunday, March 12, 2017 at 3:41:11 PM UTC-4, SWISSNIXIE - Jonathan F. 
wrote:
>
> Hi
>
> This might be a little off topic or irrelevant, but maybe someone is 
> interested in it too. 
>
> One of my hobbies aside nixies is technology related with radiation and 
> nuclear (geiger counters, etc). 
> Today i was sorting my nixies into boxes and held a B-5092-A from 
> Burroughs, as i spotted a print that looked like a part of a radiation 
> warning sign, i inspected all of my B-5092-A - and bingo, one had the 
> complete sing. So this tubes are or have been radioactive. 
>
> Before anyone gets nervous about having possible radioactive nixies i will 
> write a detailed report about this. 
>
>
> For these who not know, everything is radioactive, even the air we breathe 
> all day - this is because of the naturally occuring radiation comming from 
> minerals and of cosmic rays entering or earth. A Geiger Counter measures 
> radiation events in time, usually "counts per minute" or "counts per 
> second". The background-rate depends on your location (e.g. in the montains 
> you have a higher rate than in cities). The CPM (counts perminute) depend 
> on the type of detector - but the calculated dose should always be the same 
> (some detecors for example give you 100cpm others only 1cpm but with their 
> conversion factors both end up giving the same dose).
>
> The normal background dose on earth is usually *0.1* to* 0.5* 
> microSievert/hour (uS/h)
>
> My background at home is *0.15 uS/h  *which is* 40 CPM* with my type of 
> detector. 
>
> The B-5092-A reads only about 
>
> *100 CPM (0.4 uS/h)*Is it dangerous for your health? - Far from it! You 
> could carry this tube your whole life around your neck and it would not 
> endanger your health. 
>
> For example, an intercontinental airline flight will give your up to *3.00 
> uS/h* and not even this is dangerous - it only would affect you if you 
> would fly constantely for years.
>
> So this tubes are perfectly save to carry and handle! There maybe 
> potential way more dangerous items in your house - like watches with 
> glowing digits. 
>
>
> *** OFF TOPIC ***
>
> But why is the tube radioactive, and whats in it?
>
> To answer this you need to look in deeper in radiation.
> There are 5 types of radioactive "rays"
>
> Alpha :Can only travel a few centimeter, and are not 
> possible to penetrate paper. So if you put a paper over a alpha source, you 
> will not - or very low - notice it
> Beta  : Can penetrate thin objects, can not penetrate 
> metals like aluminium
> Gamma:  Can penetrate solid objects, penetrate medium thick 
> metals. Usually stopped by lead shielding
> Neutron:  Very high energy radiation, can nearly penetrate 
> everything, concrete, lead etc
> X-Rays:   Special form of radiation, tend to "bounce off" 
> shields instead of getting in ther. 
>
>
> I tested the tube with different Geiger-Tubes. The tube does not contain a 
> isotope (radioactive element) that is 100% alpha radiation, since alpha can 
> not penetrate the glass.
> Also, the isotope cant be 100% gamma, since a gamma geiger tube does not 
> pick up a significant change. 
> So the isotope we are looking for is potentialli a beta-isotope and is a 
> gas. The isotpe must have a relative long half-life too.
>
> Whats half-life?
> An unit to measure how long it takes for a radioactive element to be just 
> half of its activity. Eg. if your have 100 today, and the half-live is 10 
> years, there will be only 50 left in 10 years!
>
> I did a little reseach and the gas we are looking for is Krypton Kr-85
> It was used in different types of tubes, usually to help ignite something 
> (like a nixie digit). 
>
> Facts on Kr-85:
>
> It has a half life of nearly 11 Years, this means if the tube is 30 years 
> old, today only 12.5% of its radioactive gas is still active. 
> The only way Kr-85 *could* affect your health is when you drop the tube 
> and inhale the gas. 
>
> But by the fact, that there is such a small amount and only a few activity 
> of it left, the gas would merge directly with the room air and would not be 
> dangerous. 
>
> Last but not least ;) - the tube is NOT SAVE FOR EATING :-) for various 
> other reasons!
>
>
>
>
>
>

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Re: [neonixie-l] Extreme cathode cleaning?

[Nick]

Mad as a box of frogs...

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[neonixie-l] Nixie, CRT, indicators for sale

[Yuriy Ovchinnikov]

For sale:

3LO1I – 72 pcs. for $15,

6LO1I – 104 pcs.,

8LO4I – 11 pcs.,

8LO29I – 47 pcs. for $20,

8LO30I – 1 pc. for $100,

8LO39V – 20 pcs. for $20,

13LМ31V – 7 pcs.,

13LO18V – 1 pc.,

13LO37I – 1 pc.,

16LO2V – 1 pc.,

16LO2I – 1 pc.,

18LМ5V – 1 pc.

6E1P – 23 pcs. for $5

6E3P – 4 pcs. for $5

6Е5S – 25 pcs. for $10,

IV-1 – 39 pcs. for $0.6,
IV-3 used – 13 pcs. for $0.5,

IV-3A – 142 pcs. for $0.8,

IV-4 – 69 pcs. for $2,
IV-6 – 126 pcs. for $0.8,
IV-6 used – 19 pcs. for $0.5,
IV-8 – 191 pcs. for $0.8,

IV-11 – 120 pcs. for $1,
IV-11 used – 4 pcs. for $0.5,
IV-12 – 370 pcs. for $1.5,
IV-20 – 2 pcs. for $20,

IV-22 – 87 pcs. for $0.5,
IV-26 – 500 pcs. for $2,
IV-28А – 1 pcs. for $5,
IVL-1-7/5 – 2 pcs. for $10,

IVL-2-7/5 – 24 pcs. for $1.5,

IVLShU-1-11/2 – 39 pcs. for $5,

IN-1 – 264 pcs. for $1,

IN-2 – 30 pcs. for $1.8,
IN-3 – 199 pcs. for $0.5,

IN-7 – 52 pcs. for $1

IN-8 – 2 pcs. for $5,

IN8-2 – 3 pcs. for $8,

IN-9 used – 11 pcs. for $3,

IN-12A – 22 pcs. for $2, 

IN-12B – 1 pcs. for $2,

IN-13 – 1 pcs. for $3,
IN-14 – 73 pcs. for $5,

IN-14 used – 8 pcs. for $2.5,

IN-15А – 19 pcs. for $1,
IN-15B – 14 pcs. for $1,

Sockets for IN-12, IN-15, IV-22 - 50 pcs. for $1.5

IN-16 – 127 pcs. for$5

IN-16 used – 364 pcs. for $2.5

IN-17 – 26 pcs. for $3,

IN-17 used – 6 pcs. for $1.5,

Sockets for IN18, IN4, IN7 - 56 pcs. for $2.5

Sockets for IN18, IN4, IN7 used - 12 pcs. for $2

IN-19A used – 1 pc. for $1.5,

IN-19B used – 1 pc. for $1.5,

IN-19V – 2 pcs. for $2,

IN-28 – 79 pcs. for $3

Z570M used – 30 pcs. for $3

5870 ITT England used – 9 pcs. for $10

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