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. 

Brookhaven National Laboratory F5

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Brookhaven National Laboratory F5

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We charge a usage fee per photo if the photo is published, reproduced in a product or publicly exhibited. This is not a license in the legal sense. As a non-profit institution, we do not make any money providing these photographs. It is only by assessing usage fees that we are able to cover the cost of providing publication quality copies of our photos, preserving the photograph collection according to archival standards, and providing access to the collection by maintaining an online image database. The copyright holder may charge a fee in addition to our service fee.

Images are for use in educational projects only and must be used in a respectful manner.

Image title: 
A unidentified physicist at Brookhaven National Laboratory checks electronic equipment
Credit line: 
Photo courtesy Brookhaven National Laboratory. For Publication Permission Request contact Jane Koropsak, BNL-Media and Communications, [email protected], Tel: 631-344-4909

As radioactive atoms decay varying amounts of energy are given off, often in the form of radiation, such as gamma rays. By measuring the amount of radiation at intervals, physicists can improve the understanding of the systematics of the release of energy in the nucleus, or heart, of an atom of a given element. In this photo, a unidentified physicist at Brookhaven National Laboratory, Upton, New York, checks electronic equipment which will record the gamma ray energy given off by a sample of radioactive tellurium 123 inside the black cylinder on the table at right. One index of the energy is the white 'wedge' which appears on the television-like screen, or oscilloscope. The taller the 'wedge', the greater the energy of the gamma rays. The rays send light specks out from a crystal in the top of the black cylinder, where photoelectric tubes pick up the specks and amplify the signal for recording in nearby equipment.

Original format: 
1 photographic print (black and white; 10 x 8 inches)
Brookhaven National Laboratory