Difference between revisions of "Fe55 peak shape"
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The light coloured plots were produced with the 55Fe source centred over the wire; for the darker plots the source was | The light coloured plots were produced with the 55Fe source centred over the wire; for the darker plots the source was | ||
close to the side of the tube. | close to the side of the tube. | ||
− | The operating voltage for that mix was previously chosen to be 1450V. Afterpulses are present at 1550V (delayed, so are not included in the integration). | + | The operating voltage for that mix was previously chosen to be 1450V. Afterpulses are present at 1550V (delayed, so are not included in the integration). |
{| border="0" cellpadding="2" | {| border="0" cellpadding="2" | ||
|width="400pt"| | |width="400pt"| |
Revision as of 21:43, 11 November 2010
Fe55 with 50/50 Ar/CO2, New preamp and new HVB, ADC half-range
Mixed 50/50 at 40 sccm total, moved the source (collimated as usual) across the top of the straw towards the edge.... With the source over the edge of the straw, the count rate halves and the camel disappears.
Overlaying side and edge data, the light coloured plots are with the source above the wire.
Repeated at 60 sccm
Events histograms with the source above the wire.
Events histograms with the source off the wire (above the edge of the tube).
90/10 Ar/CO2 (premixed) at approx 80 sccm
The light coloured plots were produced with the 55Fe source centred over the wire; for the darker plots the source was
close to the side of the tube.
The operating voltage for that mix was previously chosen to be 1450V. Afterpulses are present at 1550V (delayed, so are not included in the integration).