If the horse hadn't messed with the Beo........
jeremy-ca wrote:
> "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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