Recharging N95 masks using a van de Graaff generator for safe recycling

Beams of heavy ions from particle accelerators are used to produce radiation damage in metal alloys. The damaged layer extends several microns below the surface of the specimen with the maximum damage and depth dependent upon the energy of the ions, type of ions, and target material. Using 4 MeV heavy ions from a Van de Graaff accelerator causes peak damage approximately 1 μm below the specimen surface. To study this area, it is necessary to remove a thickness of approximately 1 μm of damaged metal from the surface (referred to as “sectioning“) and to electropolish this region to electron transparency from the unirradiated surface (referred to as “backthinning“). We have developed electropolishing techniques to obtain electron transparent regions at any depth below the surface of a standard TEM disk. These techniques may be applied wherever TEM information is needed at a specific subsurface position.

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Atoms in the campus: Van de Graaff accelerators and the making of two major Latin American universities in 1950s Brazil and Mexico

Annals of Science ◽

10.1080/00033790.2021.1949493 ◽

2021 ◽

pp. 1-27

Author(s):

Adriana Minor

Keyword(s):

Latin American ◽

American Universities ◽

Latin American Universities ◽

Van De Graaff

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Van de Graaff for CBNM

Physics Bulletin ◽

10.1088/0031-9112/28/5/023 ◽

1977 ◽

Vol 28 (5) ◽

pp. 212-212 ◽

Cited By ~ 2

Author(s):

A Crametz

Keyword(s):

Van De Graaff

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Optical Lifetime Measurements Using a Positive Ion Van De Graaff Accelerator

Applied Optics ◽

10.1364/ao.7.000167 ◽

1968 ◽

Vol 7 (1) ◽

pp. 167 ◽

Cited By ~ 44

Author(s):

L. L. Nichols ◽

W. E. Wilson

Keyword(s):

Lifetime Measurements ◽

Graaff Accelerator ◽

Van De Graaff ◽

Positive Ion

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Particle accelerators in Mexico

Historical Studies in the Physical and Biological Sciences ◽

10.1525/hsps.2006.36.2.297 ◽

2006 ◽

Vol 36 (2) ◽

pp. 297-309

Author(s):

MARÍÍA DE LA PAZ RAMOS LARA

Keyword(s):

Latin America ◽

Nuclear Physics ◽

Particle Accelerator ◽

Particle Accelerators ◽

Van De Graaff ◽

Experimental Nuclear Physics

ABSTRACT The first Van de Graaff particle accelerator in Latin America was installed at the Universidad Nacional Autóónoma de Mééxico (UNAM) in 1952. This event marked the beginning of experimental nuclear physics, exclusively for peaceful purposes, in Mexico. The acquisition of this accelerator was fundamental for placing other accelerators into operation, which were used for both research and the resolution of national problems.

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