Have experience using a Varian ~10 tesla NMR to erase various magnetic media. Very quick and effective, just ensure there are no metal parts on the media which would pull it into the magnet.
Michael N. Cooper MS, MPH, CIH
Senior Managing Scientist
Exponent® / Failure Analysis Associates
149 Commonwealth Drive, Menlo Park, CA 94025
( TEL +650 688-1760 7 FAX +650 688-1799 CELL +408 313-2127
VCR and reel to reel use magnetic methods to store information - you're talking iron and/or chromium oxides on plastic film. Microfiche (microfilms) come in various types, one of which is the classic silver film negative, yes. But others are all organic - for example, diazo compounds.
I would assume snuggling your recorded videocassettes up to an NMR magnet would take care of scrambling them. I'd love to see an empirical test by someone on the list.
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On Aug 26, 2013, at 10:20 AM, Rortvedt deZero <rortvedt**At_Symbol_Here**HOTMAIL.COM> wrote:
Has anyone ever characterized VCR, reel-to-reel or microfiche for silver to ensure they're not a hazardous waste?
If you are mainly trying to destroy the info on the tapes, I recommend a magnetic bulk tape eraser.
New ones seem expensive, but there are several used ones on e-bay, etc.
On Aug 23, 2013, at 6:25 PM, "Murphy, Dr. Ruth Ann" <rmurphy**At_Symbol_Here**UMHB.EDU> wrote:
Thank you for all your helpful responses to my question about hazardous high school chemicals. One more question has arisen: How could an organization dispose of 300-400 videocassette tapes with sensitive information? I was asked about chemical treatment – or burning, and would appreciate your advice.
Ruth Ann Murphy, Ph.D.
Professor of Chemistry
Chairperson, Department of Chemistry, Environmental Science and Geology
Chairperson, Health Professions Advisory Committee
Amy LeVesconte Professorship of Chemistry
JAMP Faculty Director
Goldwater Scholarship Faculty Representative
The University of Mary Hardin-Baylor
900 College Street
Belton, TX 76513-2599
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