summary of answers on lead hazards

["John Zummo" <zummo@gene.COM>]

Thanks to all who responded to my question on the hazards of lead.

The consensus is that for small amounts of lead, the standard
radiological precautions are probably sufficient.  Wearing gloves,
washing hands, and no food in the area will protect against ingestion
risks.

Several people noted the use of tape, paint, or other coatings to
prevent the formation of an oxide layer.  Storage of lead outdoors
contributes to the oxidation.

In addition to the flaking oxide layer, machining the lead (drilling,
cutting, etc.) can create an airborne hazard, so inhalation may be a
concern.

Using large amounts of lead, defined in one case as 25 or more bricks,
requires more precautions, including protective clothing, air sampling
and potentially respirators.

One interesting note was to consider other metals, such iron based sheet
metal and cans, for low energy photon shielding.

Another consideration is that any wipes, gloves and other protective
items used for lead work are hazardous waste and must be treated as
such.

Thanks again for all the useful information.

Regards,

John


John Zummo, RSO
Genentech, Inc.
(415) 225-2959
(415) 225-5008 (fax)
zummo@gene.com