Taken with their old NIM system and emailed to us; same
sample as above (according to them), evidently taken apr. 500 days earlier.
Used as a basis for our claim for better resolution achieved with the netMCA.
The typical for analog systems low-end oscillation can be seen before it
is apparently cut off with the LLD.
ijsold.spc - DPS/nuvi (netMCA) object format
ijsold.spm - Nucleus-2 format
ijsold.asp - Plain ASCII format
ijsold.spe - ASCII format with some details
Weak 60Co source and 9.9cpS pulser plus a 3.8kcpS
241Am. Peak shift for the pulser line (top of the spectrum) - 0.33 channels @ 8k,
practically undetectable. Resolution degradation well below 0.1 keV;
counting loss compensated to < 1.7% error (seen at the 9.9 cpS peak pulse).
ijs4kam.spc - DPS/nuvi (netMCA) object format
ijs4kam.spm - Nucleus-2 format
ijs4kam.asp - Plain ASCII format
ijs4kam.spe - ASCII format with some details
These two spectra were acquired simultaneously with the netMCA and their
NIM equipment (the netMCA using the "timing" output of the detector preamp).
The time information is lost because we got the two spectra evaluated
there emailed back to us in ASCII format; however, the netMCA spectrum is pretty
much the same as this one (same spectrum recorded
a bit earlier or later).
The netMCA has >5% better resolution at 1332.5 keV (2.09 vs. 2.2) and is
>12% better at 59.54 keV (0.81 vs. 0.93).
The energy range of the netMCA is also better, it sees a peak at 7.9 keV
which the analog system does not see (at 7.9keV it only sees its own
noise/oscillation). The NIM spectrum had to be calibrated by two points
to compensate the offset-0 of its ADC, on the netMCA a 1 point calibration
was enough (it has no offset-0 by design).
Intercomparison spectrum taken by the netMCA:
ijsfbnmc.spc - DPS/nuvi (netMCA) object format
ijsfbnmc.spm - Nucleus-2 format
ijsfbnmc.asp - Plain ASCII format
ijsfbnmc.spe - ASCII format with some details
Intercomparison spectrum taken by their NIM equipment:
ijsfbnim.spc - DPS/nuvi (netMCA) object format
ijsfbnim.spm - Nucleus-2 format
ijsfbnim.asp - Plain ASCII format
ijsfbnim.spe - ASCII format with some details
nmcnimcp.xls - a comparative analysis they did on the two spectra in .xls format and kindly emailed us.
Some apr. 100 cpS source measured with the same Be windowed
detector as the others but at twice the gain. Just a little better resolution
because of less quantization etc. noise, just as one would expect.
ijshg1.spc - DPS/nuvi (netMCA) object format
ijshg1.spm - Nucleus-2 format
ijshg1.asp - Plain ASCII format
ijshg1.spe - ASCII format with some details
Some apr. 350 cpS source measured with the same Be windowed
detector as the others but at twice the gain. Just a little better resolution
because of less quantization etc. noise, just as one would expect.
Much better resolution than with their old NIM equipment, 1.97 vs. 2.2
keV @ 1332.5 and 0.815 vs. 0.97 @ 88keV .
ijshg2.spc - DPS/nuvi (netMCA) object format
ijshg2.spm - Nucleus-2 format
ijshg2.asp - Plain ASCII format
ijshg2.spe - ASCII format with some details