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 2.GQ Geiger Muller Counter
 GQ GMC-300E Plus 64kb How long can it record?
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design_fort

Germany
4 Posts

Posted - 07/19/2022 :  09:00:44  Show Profile  Reply with Quote
Hi all,

I'm thinking of getting a GQ GMC-300E Plus as it is within my price range. I understand it has 64kb of memory.
How long can it record until the memory is full? Does it output in Excel format?

Thanks in advance?
Herb
Reply #1

ullix

Germany
806 Posts

Posted - 07/19/2022 :  23:52:15  Show Profile  Reply with Quote
Herb,

it depends on the type of recording set by you and the intensity of the radioactive source. For background in CPM mode this may be up to 5 weeks. For CPS this is less than a day, but CPS should be used for short-recordings-only anyway. You can switch the counter between CPM and CPS at any time.

E.g, CPS is a good choice when you are traveling by plane and want to record the X-ray pulse during luggage-checking. CPM for the rest of the journey and for everything else.

Read the GeigerLog manual in the chapter "GMC devices", sub-chapter "History Background":
quote:
For a CPS measurement, this suffices for almost one full day of measurements. For a CPM
measurement the memory would last roughly from 1 to 5 weeks. The duration depends strongly on
the intensity of the radiation due to the storage algorithm implemented in the Geiger counter
firmware. It should easily cover even an extended vacation, unless you plan on camping inside a
damaged nuclear reactor!

If you want to dig deeper, find even more details in chapter "Appendix E GMC Device: Internal Memory, Storage Format and Parsing Strategy".

Neither counter nor software GeigerLog do output in strict Excel format. However, you can download the counter history with GeigerLog, and output the data in CSV (Comma separated values) format, which can easily be read or even pasted into Excel (if this is needed at all, as the analysis can be done in GeigerLog itself, offering even more analysis than Excel can).

Download software, manual and more from here: https://sourceforge.net/projects/geigerlog/

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Reply #2

design_fort

Germany
4 Posts

Posted - 07/20/2022 :  06:44:03  Show Profile  Reply with Quote
Hi Ullix,

thank you so much! This helps a lot. Also thanks a lot for this fantastic software! I think this is exactly what I need.

Greetings
Herb

quote:
Originally posted by ullix

Herb,

it depends on the type of recording set by you and the intensity of the radioactive source. For background in CPM mode this may be up to 5 weeks. For CPS this is less than a day, but CPS should be used for short-recordings-only anyway. You can switch the counter between CPM and CPS at any time.

E.g, CPS is a good choice when you are traveling by plane and want to record the X-ray pulse during luggage-checking. CPM for the rest of the journey and for everything else.

Read the GeigerLog manual in the chapter "GMC devices", sub-chapter "History Background":
quote:
For a CPS measurement, this suffices for almost one full day of measurements. For a CPM
measurement the memory would last roughly from 1 to 5 weeks. The duration depends strongly on
the intensity of the radiation due to the storage algorithm implemented in the Geiger counter
firmware. It should easily cover even an extended vacation, unless you plan on camping inside a
damaged nuclear reactor!

If you want to dig deeper, find even more details in chapter "Appendix E GMC Device: Internal Memory, Storage Format and Parsing Strategy".

Neither counter nor software GeigerLog do output in strict Excel format. However, you can download the counter history with GeigerLog, and output the data in CSV (Comma separated values) format, which can easily be read or even pasted into Excel (if this is needed at all, as the analysis can be done in GeigerLog itself, offering even more analysis than Excel can).

Download software, manual and more from here: https://sourceforge.net/projects/geigerlog/



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