Commander1024/radiation-tagger
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Added guide for downloading radiation data.

Marcus Scholz 2020-04-22 20:31:08 +02:00
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download_rad.md Normal file

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# Download radiation data
## Assumptions
This step completely depends on [geigerlog](https://sourceforge.net/projects/Geigerlog/), a great open source tool written in Python 3. Currently my tool only supports CSV-exports out of geigerlog (`filename.hisdb.his`), although it should be easy to modify the default behaviour.
When geigerlog is being used with a device with one 'geiger muller tube' this export file looks like this
```
# 172, 2020-03-15 12:49:38, Date&Time Stamp; Type:'CPS, save every second', Interval:0.99 sec
184, 2020-03-15 12:49:38, 22.0, 0.0
185, 2020-03-15 12:49:39, 22.0, 0.0
186, 2020-03-15 12:49:40, 22.0, 0.0
187, 2020-03-15 12:49:41, 21.0, 0.0
188, 2020-03-15 12:49:42, 22.0, 1.0
```
Lines with '#' are filtered out by a lambda function:
`csv = csv.reader(filter(lambda row: row[0] != '#', f), delimiter=',', skipinitialspace=True)`
Only relevant values (timestamp and CP/M) will be read into memory:
```
# Import only relevant values, that's timestamp and CP/M
for _, csv_raw_time, csv_raw_cpm, _ in csv:
```

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2
preparation.md

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## Geigercounter
This is the most critical part to get right, honestly. The internal clock is not as stable as I wished it was and drifts by quite a few seconds per day. So it is wise to set the clock every time you go out. But be careful as it produces funny results when the time jumps "backwards". But it is possible to set the clock with the geigercounter turned off. Erasing the "Saved Data" on the device after setting the clock does also help, but then - of course - you have to pull the log after every tour.
If you use the `geigerlog` tool as described here, make sure your Notebook timezone is set correctly and that it has got Internet access for NTP to work. :-)
If you use the [geigerlog](https://sourceforge.net/projects/Geigerlog/) tool as described here, make sure your Notebook timezone is set correctly and that it has got Internet access for NTP to work. :-)
Open `GeigerLog`, connect to the device and select Device -> GMC Series -> Set Date+Time: