Emilio Segrè Visual Archives

More than 30,000 photos of scientists and their work

Attention ESVA Patrons:

The Emilio Segrè Visual Archives’ site is moving soon and adopting an open access approach to digital image sharing. Once we have transitioned to the new site in 2021, we will no longer charge for our high-resolution digital images or usage fees (note that we do not hold copyright to all the images in our collections and you will still need to obtain permission for those which we do not own).

If you are working on a long-term project, we advise you to wait until the migration is complete so that you may obtain our copies for free. If you cannot wait, email us at nbl [at] aip.org and we will do what we can to assist you. We will not be offering refunds for past purchases.

For more information, please visit our FAQ page on the Ex Libris Universum blog. 

Bromley David Allan F2

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Bromley David Allan F2

David Allan Bromley
Image title: 
Almqvist and Bromley with Scattering Chamber
Credit line: 
AIP Emilio Segrè Visual Archives, Bromley Collection

Left to right: Einer (Joe) Almqvist and D. Allan Bromley. Caption courtesy D. Allan Bromley: "The large scattering chamber designed for use with the Chalk River 4 MV accelerator and the future En-1, 5 MV tandem Van de Graaff accelerator. When this chamber was designed by Einar Almqvist, shown on the left, and [myself], particle detectors were usually ionization chambers, proportional counters, or photo-multipliers coupled to cesium iodide crystals. This large diameter chamber was designed to give us the flexibility to install a number of such detectors simultaneously for coincidence measurements, complete angular distribution measurements, and the like. During the time that it took to construct this chamber, James McKenzie and I developed the first solid-state particle detectors that had enormous advantages over the previous ones available. The semiconductor units were vastly smaller, had much higher resolution, operated at very low voltage, and were extremely rugged and reproducible. Because of this, they rendered this large chamber obsolete by the time it was constructed and it was, in fact, never used."

Original format: 
1 photographic print (black and white; 9.5 x 7.5 inches)
Bromley, D. Allan (David Allan), 1926-2005
Almqvist, Einar