|Title||AMINCO Photomultiplier Microphotometer|
|Description||Green steel case with slanted readout display. Switches, knobs and connectors on front. Stainless steel handle. Old tag reads "Requires modifying P.O. 80408, Howerton//MC 4 May 31, 1955". Masking tape on side labels scope and meter connectors. Torn paper taped to side reads "TO BE USED WITH OSCILLOGRAPH". Old brown electric cord.|
|Caption||AMINCO Photomultiplier Microphotometer|
This is the photometer readout for the AMINCO-Bowman Spectrophotofluorometer. As such, it was one of the first. A recorder can be attached.
From "Photomultiplier Tubes," Mortimer Abramowitz and Michael W. Davidson, learn.hamamatsu.com/articles/photomultipliers.html : "A photomultiplier tube, useful for light detection of very weak signals, is a photoemissive device in which the absorption of a photon results in the emission of an electron. These detectors work by amplifying the electrons generated by a photocathode exposed to a photon flux. Photomultipliers acquire light through a glass or quartz window that covers a photosensitive surface, called a photocathode, which then releases electrons that are multiplied by electrodes known as metal channel dynodes. At the end of the dynode chain is an anode or collection electrode. Over a very large range, the current flowing from the anode to ground is directly proportional to the photoelecton flux generated by the photocathode."
|Notes||Restrictions: broken glass|
|Number of images||1.0|
|Organizations||NIH; NHLBI, Laboratory of Technical Development|
|Buildings||Building 10 ("CC" Warren Grant Magnuson Clinical Center)|
|NIH Property #||01093814|
|Old NIH Property #||none|
Bowman, Robert L.
Howerton, Hugh K.
Knutson, Jay R.
Chen, Raymond F.