HotBits Hardware 9 volt input signals and has reedrelay output, you can just hook up the modified Monitor 4 directly to it, but most people don t have such fancy hardware. http://www.fourmilab.ch/hotbits/hardware.html
Extractions: The HotBits hardware uses off-the-shelf items with only minor modifications and additional components. By interfacing with the computer's serial port and making all the measurements in software, all the complexity of my original 1986 design is eliminated. To conserve network bandwidth and reduce download time, the colour figures in this document are small images in JPEG form. If your browser cannot display JPEG images, or you want to examine an image in more detail, click on it to display a larger GIF image. After viewing the larger image, your browser's "Back" button will return you to this document. To detect radioactive decay events, I use a commercial radiation monitor which contains a Geiger-Müller tube detector. Since we're interested in timing individual events, a detector of this kind is essential; many radiation monitors use an ionisation chamber which measures the average level of radiation but does not permit timing individual particles. The detector I used is called "Monitor 4", and is manufactured by SEI of Summertown TN 38483, USA. A do-it-yourself kit version of this detector used to be sold by Heathkit, back when such things still existed, but today only assembled versions are available. Here's the monitor as listed in the Edmund Scientific catalogue; you can order one from them (101 E. Gloucester Pike, Barrington NJ 08007-1380, USA; Tel. +1 609 573-6250, Fax: +1 609 573-6295). The price may have changed since the 1996 catalogue I referred to when writing this document, so be sure to call and confirm price and availability.
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