Comparison of UK geiger counters and a scintillation counter exposed to 4.5 uSv/hour gamma field

Comparison of UK geiger counters and a scintillation counter exposed to 4.5 uSv per hour 0.511 Mev gamma radiation uniform field from the nuclide F18. Instruments are a Mini Monitor 900 with type E probe, a Mini Instruments 1000 series mini-rad, a FH40 series dose equivalent meter, a SAIC PD2i digital dosimeter, and a nuclear enterprises RM5/1 ratemeter connected to a D. A. Pitman Limited 1970s NaI(T) gamma scintillation probe. The source is over a metre away to the top of the picture, so all instruments receive a similar exposure.