For detailed information on the most effective use of "lead" in your paints . .. write to Lead Industries Asso ciation, 420 Lexington Avenue.

Ionizing Radiation CONSTRUCTION SPECIFICATIONS FOR INDUSTRIAL X-RAY OR GAMMA ENCLOSURES 1 All X-ray or gamma enclosures to be provided with protective barriers of sheet lead or equivalent protective materials of assured quality, uni formity and permanency 2 Sheet lead to be mounted so as to avoid cold-flow and to be protected from mechanical damage Sheet lead less than 1/16 in thick to be bonded to rigid supporting materials 3 Sheet lead joints to be overlapped with a lap at least 1/2 m , or twice the thickness of the sheet, which ever is greater Joined sheets to be m direct contact Butt joints may be used provided the welded or burned seams are not less than the minimum lead equivalent required 4 Joints between different kinds of protective materials to be designed to avoid leakage through the lighter material Where floor (or ceiling) is not lead-lined, lead sheet on wall to extend into floor (or ceiling) Joints may be flanged to provide, at the joint, protection equivalent to lead-lined walls 5 Comer construction to provide same protection as that required for body of enclosure 6 Lead sheets not to be perforated by nails, bolts or other fasteners unless they are adquately covered to give protection equivalent to unperforated lead sheet 7 Openings in barrier for pipes, conduits, air ducts, louvers, etc , to be pro vided with baffles so that transmitted radiation does not exceed that trans mitted by the barrier itself 8 Observation windows and doors to have the same lead equivalent as that required of surrounding wall 9 Where floor is not lead lined, door sill to be provided with lead baffle, lead covenng of door to overlap door jamb Radiation scattered under door or passing through door clearance spaces, not to exceed that trans mitted by door Fig 44-10 lfications are enumerated in Fig 44-10 Special attention must be given to the de sign of the joints between different protective materials, such as lead and concrete, in order to avoid leakage due to scattering through the lighter matenal This is illustrated in Fig 44-11 Where the control room, office space or film processing room is located adjacent to the shielded enclosure and ready access from 1464

The uses are the same as for Euston Superior Grade White Lead, however, Euston Standard Grade White Lead is more especially adapted for dry color manufacturing.

For detailed information on the most effective use of "lead" in your paints . .. write to Lead Industries Asso ciation, 420 Lexington Avenue.

For detailed information on the most effective use of "lead" in your paints . .. write to Lead Industries Asso ciation, 420 Lexington Avenue.

Lead pigments naturally are and two coats of pure white lead paint.

Requirementa for the Hygienic Control of the Manufacture, Distribution and Use of Lead Tetraethyl for the Preparation of Motor Fuel* Foreword The hygienic control of operations involving the production or use of lead tetraethyl differs from that required in the more common lead trades, in that there is serious danger of exposure to a liquid organic lead compound, as well as to inorganic lead compounds* Exposure to lead tetraethyl arises from the volatility of this compound and also from its absorbability through the healthy unbroken skin* Its vapor pressure la such that under the conditions of equilibrium at 25C, a concentration of approximately 5 mgm* of load per liter of air will exist.

LEAD DISEASES.

CHILDHOOD LEAD POISONING-CONFERENCE KEYNOTE Agnes Latimer, M.D.

The lead treatment of cancer.

Of more importance, however, is the fact that the significance of the exposure to, and absorption of, lead in inorganic form is much more readily established by the determination of the lead content of the blood of exposed persons, than by that of the urine.

igment: Ked Lead 100?

Lead (Reprint froo "Chemical Engineering*) TV.)

Introductory Comments Ideally, the metallic lead or lead compounds emitted from the vents, open operations and stacks of industrial plants in which various lead-containing materials are handled; employed as raw materials; or fabricated into finished products; should be captured and confined entirely within the premises of the plant.

Lead-ln-oll sales vlll be up substan tially because of the removal of restrictions <m the use of dry vhlte lead In producing lead-ln-oll.