ML19249B711
| ML19249B711 | |
| Person / Time | |
|---|---|
| Issue date: | 08/13/1979 |
| From: | Minogue R NRC OFFICE OF STANDARDS DEVELOPMENT |
| To: | Evans L AFFILIATION NOT ASSIGNED |
| References | |
| NUDOCS 7909040689 | |
| Download: ML19249B711 (2) | |
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.vamm.cl oN. o. c 20sss AUG 131979 Mr. Lee Evans 238 Senisa Drive San Antonio, Texas
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Dear Mr. Evans:
Subj ec t :
Radioactive Materials in Glasses This responds to your letter of July 30, 1979, to the Chairc.an, fiuclear Regulatory Conmission, requesting answers to eight cuestions on uranium, thorium, or other radioactive caterials in eyeglasses, sunglasses, and brand name glasses.
The source docurent for answering your first six questions is the enclosed book, " Radioactivity in Consumer Products", published by the t;uclear Regulatory Comnission in August 1978.
In the article, "f:aturally Occurring Radioactivity in Ophthalmic Glass," the authors state on page 227:
"Because therium and uranium are distributed widely in the earth's crust and are present at very lcw levels in practically all sands and other raw materials used in ophthalmic glass manufacture, some background activity can be expected in all samples."
In the article, " Radiation Control Regulations of the States," the author states on page 69:
"The petrochemical industry sometimes uses radioactive tracers to reasure flow and reaction rates, and this may result in slightly contaminated retrochemicals and plastics."
Thus, there is a finite probability of uranium, thorium, or other radionuclides appearing in opilthalmic glass and plastics in eyeglasses and sunglasses.
7900440681 304131
Mr. Lee Evans With regard to your seventh and eighth questions on brarid nwe glasses, the authors of the oj.hthalmic glass article note on page 232 that glass samples obtained from four U.S. oanufacturers ( Ar.erican Optical Corp., Bausch and Lamb Co., Corning Glass Works, and Shott Optical Glass, Inc.) were examined in their survey.
I am not aware of any study or report that lists v. hat brand name glasses do not contain radioactive natorials.
Jim Henry, a senior health physicist on c.y ctaff, tried to call you but could not learn your telephone nu ber.
If this letter is not fully responsive, please feel free to call him on 301/413-5916 for additional infornation.
Sincerely, A i
/t. ' o l{3
,1lt...-
Robert B. Minogue, Director Of fice of Standards Development
Enclosure:
NU,"EG/CP-0001 304182