Dear Armando,
thanks for your reply. I know you are very busy.
I assume the live time parameter is loaded in PyMca in order to compensate for dead time, so I would say to use the formula (realtime*OCR/ICR) value.
Please find attached a quite recent .mca file (collected in September, with a detector supplied in 2019 and XIA Prospect software v 1.1). As far as I know, nothing regarding the “dead time” stuff has changed since v 1.6.
Rev. 1.6, March 2021: Declaration of conformity updated
Rev. 1.5, June 2020: VICO-DP manual updated to version 1.3 (minor changes)
Rev. 1.4, July 2018: power connector pin numbers revised matching the manufacturer’s nomenclature (Binder)
Rev. 1.3, March 2018: technical drawings updated (RS232 connector)
Rev. 1.2, December 2017: VICO-DP manual updated to version 1.2
Rev. 1.1, August 2017: power connector pinning revised, section 2.22
Rev. 1.0, July 2017
Moreover, XIA products manuals mention that with Prospect:
[cid:img...@01...1C7F80]
Interestingly, in Prospect GUI the dead time is displayed but not saved in the .mca file together with ICR, OCR, realtime and livetime (triggering filter).
Anyway, I am in contact with Ketek’s guys: if they change something in future, I think they will notify me.
Best regards,
Giacomo
Da: PyMca general purpose mailing list. [mailto:pym...@li...]
Inviato: Wednesday, November 10, 2021 3:19 PM
A: pym...@li...
Oggetto: Re: [PyMca] Livetime in Ketek AXAS D .mca file
Dear G. Siviero,
Thank you for rising a very important point and sorry for the delay on answering. I have been out of business during some time...
Basically what you are saying is that the live time I should take is Real Time * OCR/ICR.
The reference file I have is:
File Version = 2
MCA data = <Generated by ProSpect - v1.1.14>
The link you provided seems to be from revision 1.6
Do you know if something has changed in the format following the different revisions? Can you provide me with a recent file?
If I have no comment against it, I will proceed to calculate the Live time from the formula above instead of the value present in the file.
Best regards,
Armando
On 04/08/2021 10:06, PyMca general purpose mailing list. wrote:
Dear All,
I had some troubles in loading .mca spectra (version 5.6.5). I think the problem might be in the header lines splitting. Please, find attached my comments (.pdf format).
Moreover, I have some concerns about the loaded livetime: the stored “Livetime” value is not the energy filter one (actual counting time), according to Ketek AXAS D manual (https://www.ketek.net/wp-content/uploads/KETEK-AXAS-A-D-with-VICO-DP-Manual-Rev1.6_March_2021.pdf ): “
The displayed Live Time is NOT the live time of the energy filter, rather it is a measurement of time that the triggering
filter remained under threshold. This measurement, along with the number of times the threshold was crossed, or
Fast Peaks, is used to calculate the input count rate.
ICR = Fast Peaks / Live Time
The Live Time of the energy filter is not displayed in software, but can be calculated according to:
Energy filter Live Time = Real Time ۰ OCR / ICR
The Dead Time percentage is displayed in software, calculated as:
Dead Time = 1 – OCR/ICR
”
Thanks for your effort.
Regards,
G. Siviero
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