IMPULSE Question

[Antandt]

Hi Everyone,

I have a very tall x-ray or something coming in on my detector about 1 keV or so. In PRA, I was able to start the spectrum later than this line. Is there a way to do this in IMPULSE that I don't know about?

See Pic for first peak at the very beginning. The detector itself is a small LaCl3(CE) that appears to work very well. It just picks up this line no matter what program or settings I use. Oh, and if you ever get one of these detectors, you will always see an x-ray around 32 keV. Doesn't matter what source material you are measuring. I find it to be a calibration reference sometimes.

Thanks,
Anthony

[Sesselmann]

Anthony,

Thanks for your question.

Yes the LLD (Lower Limit Discriminator) field is right under the spectrum, it is in arbitrary units (Not channels) so if you want to filter out a fixed number of channels you can just multiply the channel size (bin size) by the number of channels you want to filter out.


Steven

[Antandt]

Thanks Steven,

I will try that. I have been using IMPULSE last night and today and I really do like it. It is similar to PRA but not entirely. I don't know if it's possible but I would like to see if some minor 'deconvolution' could be done similar to Theremino. Some people don't like that function but I do when it works correctly. I have had success using the pulse shape and settings to get better resolution. I have an old PGT HPGe detector at work that will give you great spectra, but the time and money spent on cooling is a drawback for me. Plus, it technically is not mine :)

Thanks,
Anthony

[Sesselmann]

Anthony,

You are right Impulse and PRA look different, but under the hood they both use the same pulse detection and pulse filtering method.

Instead of convolution I think the Gaussian correlation is a good alternative way to make pulses stand out, in Impulse and PRA for that sake the gaussian can pick up pules that are barely visible to the naked eye.

Steven

[Antandt]

Hi Steven,

Are there any programs that will import this JSON format? I tried a couple and couldn't get it to work

Thanks,
Anthony

[Sesselmann]

Anthony,

The JSON format is NPESv2 from the open gamma project https://github.com/OpenGammaProject

On Impulse Tab2 you can also export your spectrum to simple .csv most programs can import this.

[Antandt]

Ok Thank you!