Vintage 1951 Beckman CD-3 Radiation Detector VERY RARE Also known as the "Paint Can" Detector The following info is taken off the original Patent: Also see the pic provided Radiation detector US 2735947 A Publication number US2735947 A Publication type Grant Publication date Feb 21, 1956 Filing date Dec 5, 1951 Inventors South Pasadena Original Assignee Beckman Instruments Export Citation BiBTeX, EndNote, RefMan Patent Citations (7), Referenced by (11), Classifications (7) Feb.2 1, 195e 2,735,947 E. W. MOLLOY RADIATION DETECTOR Filed Deo. 5, 1951 [VvE/VTM.- [V-@ETT h/ /VoLLo y United States Patent RADIATION DETECTOR Everett W. Molloy, Wilmar, Calif., assigner to Beckman Instruments, Inc., South Pasadena, Calif., a corporation of California Application December 5, 1951, Serial No. 259,954 13 Claims. (Cl. Z50-L83@ This invention relates to devices for detecting nuclear radiations and, more particularly, refers to a portable radioactivity detector of relatively simple and inexpensive construction. The general object of the invention is to provide a sensitive and reliable radiation detector for use by relatively unskilled operators. Such a device, for example, would be suitable for widespread use in civilian defense for scouting radioactive areas. One important object of the invention is to provide a relatively simple electrical circuit arrangement for detecting and measuring radioactivity, which circuit arrangement may be incorporated in a relatively light portable device energized by a simple small battery source. This object is achieved largely by a circuit arrangement in which an input capacitor and an output capacitor are combined with a vacuum tube or thermionic valve to detect amplitied currents generated by the effect of radiation in an ionization chamber. lt is another object of the invention to provide an extremely simple and reliable means to indicate the magnitude of the currents generated in the ionization chamber, thereby to afford a measure of the intensity of the radioactivity in the area under test. In this regard the invention is characterized by the concept of measuring the ionization current in a cumulative manner. An accumulator cycle is repeated at a frequency determined by the magnitude of the ionization current and means responsive to the accumulator 'cycle provides a sensible signal to indicate the frequency of the cycle. While various signall means may be employed in various practices of the invention, an important feature of the preferred practice described herein is the use of a glow discharge tube for the dual purpose of cooperating in the accumulator cycle and of serving" as a flashing signal lamp to indicate the frequency of the cycle. A'furth'er object of the .invention i's to provide a detector of this character that is of simple, inexpensive constructionl and yet rugged and capable of withstanding both 'rough usage and exposure to moisture. For this purpose the presently prefered form of the invention is incorporated in an ordinary container with a removable cover. The preferred container is a tin can ofthe type commonly used for containin-g'paint. The can serves not only as a housing' for the detector parts, but also as the required ionization'chamber and is'readily sealed against moisture. Such acan provides a relatively large ionization chamber and thus permits theV use of less critical components. Preferably all the parts of the detector combination are mounted on the lid of thefc'an to facilitate initial assembly as well as to facilitate subsequent inspection and servicing of the detector. A further advantage in the use of such a container is that a damaged can body may be quickly and conveniently replaced when necessary. The` above and other advantages and objects of the invention may be found in the following detailed description, together with the accompanying drawings; PLEASE SEE PICTURES FOR EXACT CONDITION **Shipping cost reflects shipping to lower 48 United States. ****Check out my other auctions for cool vintage items picked up along the way in and around Chicago! Payment must be made within 3 days. Otherwise, it will be re-listed. International buyers please contact me for shipping prices Thanks for viewing my auction! I describe my items honestly and as completely as my knowledge of the item allows. I do not omit anything that I notice about any item. The photos in this listing are of the actual item you will receive - I do not use substitute photos. This is an auction and all sales are final. Leaving me poor feedback will not resolve any problem you may have but if you contact me about a problem, we will work it out to your satisfaction. Please feel free to ask any questions before you bid, I will respond soon as I can. I use USPS for shipping which I do every day. All items shipped to the USA will have delivery confirmation and you will receive an email with the tracking number when I ship. 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