"Exposure may result in death."
Duh, isnt that what I said over 24 hours ago.
It has been beat to death many time on several forums over the years.
No need to beat a dead horse.
Carl
KM1H
----- Original Message -----
From: "Nils Petter Pedersen" <la7sl@online.no>
To: <amps@contesting.com>; <jtml@vla.com>
Sent: Sunday, November 18, 2007 1:12 PM
Subject: Re: [Amps] BeO in tubes
> Hi !
> Found this link. Relevant info on hazards of Beryllium oxide.
> Seems to be more to it than long term effects ( ?? )
> Interested parties should have a look.
> http://www.inchem.org/documents/icsc/icsc/eics1325.htm
> 73's Peter
> LA7SL
>
> ----- Original Message -----
> From: "John Lyles" <jtml@losalamos.com>
> To: <amps@contesting.com>
> Sent: Sunday, November 18, 2007 6:54 PM
> Subject: [Amps] BeO in tubes
>
>
>> Exactly, BeO is similar to asbestos in that it causes lung tissue damage
>> (berylliosis - pardon for spelling) that can eventually develop into
>> cancer. Although not in all cases. I know a guy (a ham) who machined it
>> for years, and is always short of breath. Its a terrible thing. I believe
>> that Eimac included that little red and white note in EVERY tube box, as
>> it was probably simpler to do that than to try and get the proper
>> notification into the proper tube carton in the shipping department. If
>> they had not warned of the hazard, they could have been proven negligent
>> in a lawsuit. Reading those notes, they always said something like "this
>> tube MAY have BeO ceramic".
>>
>> There are pegmatite veins (called dikes) in the mountains near my QTH and
>> one mine I have visited used to have meter long beryl crystals. In mid
>> 1940s the miners extracted microlite, an ore of tantalum and niobium,
>> from
>> there. It was used for wartime work for electronic parts and tube
>> elements
>> (plates, getters). In the 1950s they extracted beryllium cyclosilicate
>> ore. It was the leading beryl producer in North America in 1950-51,
>> exceeding 13,000 kg per year. In 1958 the miner working the claim died,
>> and production ceased - over 690 tons of 11.2% BeO and 184 tons of 5.5%
>> had been shipped from that one mine. Four miners dug and hauled the ore
>> out. During the best days, they would bring about about a ton per day by
>> hand. A mule named Beryl lived there and stayed in the mine for years.
>> Needless to say, there were no dust masks or OSHA/MSHA safety regulations
>> then. So most of them had that disease.
>>
>> A side note, Be was also used in neutron sources and neutron reflectors,
>> and some of the early metal came from that same mine, for the Manhattin
>> project, according to something I read.
>>
>>
>> Sorry to digress from amplifiers!
>> 73
>> John
>> K5PRO, northern New Mexico
>>
>>
>>
>>
>>
>> Message: 2
>>> Date: Sun, 18 Nov 2007 08:51:39 +0000
>>> From: Steve Thompson <g8gsq@eltac.co.uk>
>>> Subject: Re: [Amps] Misconceptions about hazmat in ham radio equip
>>> To: amps@contesting.com
>>> Message-ID: <473FFD1B.80502@eltac.co.uk>
>>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>>>
>>> John Lyles wrote:
>>>
>>> > Now for beryllia. It is used in SOME power tubes, not LOTS of them.
>>> > Eimac had to include a disclaimer about it with every tube....
>>>
>>> I'm intrigued by 'had to' - do you know why?
>>>
>>> It is also in beryllium-copper metal used for EMI gasket material
>>>
>>> As I understand it: Be metal in BeCu is very safe. Raw Be is
>>> nasty, but no-one will encounter it in normal life. BeO is toxic
>>> in the same was as asbestos - it's not poisonous, but the
>>> particles cause chronic lung irritation that can develop into cancer.
>>>
>>> Steve
>>>
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>>
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>
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