Abstract
Since its introduction in 1959, the use of colour as an aid to the detection of small changes in radioactivity has become an accepted technique in radioisotope scanning. The original colour scanner (Mallard and Peachey, 1959) had a regular tapping action controlled by a microswitch and cam driven by an electric motor. More recent scanners (including the Picker MagnaScanner) have a tapper which is driven by the pulses from the scintillation detector, this system having the advantage that black-and-white carbon copies of the colour scan (Mallard, Duggan, Myers and Wilks, 1964) can be produced. However, this advantage is outweighed by the poor colour density in areas of low counting rates where the number of dots is few and the changes in colour are difficult to pick out. In this situation the colour scan is more satisfactory if a constant dot rate is used making differences in colour more obvious. The constant rate pulse generator described in this note is inexpensive and can be attached directly to the Pic...
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