User Tools

Site Tools

Navigation Menu

Flight-Control

<
Previous mounth
05/02/2024
>
Next mounth
SMTWFTS
18
28
28
29
29
30
30
01
01
02
02		0304
1905060708091011
2012131415161718
2119202122232425
2226272829303101









Hot Projects

SEEDStack

SEEDStack - Open 3D printable seed/sprouting systemDIY Food Hacking

UCSSPM

UCSSPM - Unified Clear-Sky Solar Prediction ModelOpen Solar Power

picoReflow

picoReflow - DIY PID Reflow Oven Controller based on RaspberryPiDIY Reflow Soldering

PiGI

PiGI - DIY Geiger Counter based on RaspberryPiRasPi Geiger Counter

DIY ARA-2000

Active Wideband Receiver Antenna for SDR - ARA-2000Wideband Antenna

DSpace

DSPace - Map everythingMap everything!

Mission-Tags

3d 3d-printer antenna biomass development diy dspace energy ethernet events fabrication felix geiger geigercounter gentoo geo gis gnuradio hack hardware lab linux livestream map monitoring pi picocnc picofab picoprint pigi power printer python radiation radio raspberry research rf robot sdr security simulation software solar sponsor switch test voron wind zephyr

Please share what you like

This is an old revision of the document!

Software

As of now there is only the prove-of-concept code in the repository that allows basic CPM + uSv/h measurement. This will be extended to a more powerful system, allowing audio-output (for all those nostalgic geiger nerds who want the classic tak tak counting sound.

In the future, with more time and the help of other enthusiastic developers, there will also be a ready-to-download image, with kernel, OS and counting, logging & data sharing infrastructure, which just needs to be copied to the SD card so that it works out-of-the-box.

https://github.com/apollo-ng/PiGI/tree/master/software

INES Scale for reference

Pulse size or collected charge

The GM tube output is a short charge pulse with an amplitude that is independent of the energy of the detected radiation. It just tells you that the incoming radiation had enough energy to be detected, but not how much. That leads to the question of how to calculate some other values out of the measured count rate.

Convert CPM to uSv/h

As discussed above, the GM tube doesn't know the energy of the detected radiation and also the count rate (R) depends on the tube specifications. Which means if you want to calculate a radiation dose per time (D) you can't calculate the correct value because you don't have all the information. All you can do is calculate a value as if you had radiation from Co-60, Cs-137, Sr-90 or some other radioactive isotope.

<x>D = R * conversion factor</x>

So to get from cps to µSv/h (only units here, not really a correct equation):

<x>µSv/h = cps * tube and energy specific conversion factor</x>

Common-List of Tube-Conversion-Factors

common-geiger-tube-parameter

Effect of Dead-Time on Counts

In terms of GM tubes the Dead-Time is the time after an event in which the tube will not register another count. Positive ions close to the anode reduce the intense electric field so that approaching electrons do not gain enough energy to start new avalanches. The GM tube is then inoperative (dead) for the time required for the ions to migrate outward far enough for the field gradient to recover above the avalanche threshold. The time required for recovery to a value high enough for a new pulse to be generated and counted is called the “Dead-Time” and is of the order of 100 μs (microseconds). 1) 2)

To correct for this statistical error one has to calculate the actual (corrected) rate R with the measured (observed) rate and the tube specific Dead-Time.

Formula

<x 14>R_{corrected} = R_{observed} / {1 - (R_{observed} * t_{dead})}</x>

Example

Count rate R is 87,55 CPS (counts per second) with an SBM-20 tube.

<x 14>R_{observed} = 87.55 1/s</x>

The Dead-Time for this tube is listed as 190 uS.

<x 14>t_{dead} = 190 µs = 0.000190s</x>

<x 14>R_{corrected} = {87.55 1/s} / {1 - ((87.55 1/s) * 0.000190s)} = 87.55 / 0.98337 1/s = 89.03 1/s</x>


This means that the tube statistically missed 1,48 counts per second. The actual (corrected) rate is 89,03 CPS.

1) Introduction to Geiger Counters
2) THE GEIGER COUNTER and COUNTING STATISTICS

Measurements with the LND712 showed a longer dead time than the datasheet advertised (about 120-150us). Moving up higher in the plateau also seemed to increase the dead time. For perfect operating conditions, the tube voltage should be set to a value within the advertised operating range and then fine tuned to decrease the dead time to the lowest possible value, without affecting the tubes.

, , , , , ,

Discussion

markus, 2022/02/03 12:18

i have a running server. everything works fine locally. thanks a lot.

now i want to get data to an external database (mysql/weewx on another pi). one way would be curl and parsing of *.json.

but i cannot find a json-file like the one above. how can i run pyGI Server so that it produces a json file with the live data?

what would be the path to it in my browser?

thanks in advance.

rob , 2022/11/25 16:04

Bold TextHas anyone converted this to Python 3? Python 2 was problematic, since it is not used as default in Raspian

I have slowly been converting over the files and ran intBold Texto an error:

“File ”/home/username/PiGI/software/pyGI/geigerlog.py“, line 33, in get_last_totalcount 

  db.RangeIter(include_value=False).next()

AttributeError: 'leveldb-iterator' object has no attribute 'next' ”

mike, 2024/01/07 14:10

Hi, did you ever get this to work with 3? I tried latest os and replacing with python2 but big mess.:-(

natspandcomactivate, 2023/12/06 10:59

Having been established in 1999,https://natspandcomactivate.online/ is a prominent supplier of prepaid debit cards and business prepaid card solutions, serving over 10 million clients nationwide. You can apply for a Netspend card in a few different ways. Like any other debit or credit card, you can activate your card over the phone or online as soon as you receive it.

Refugio , 2024/01/24 18:00

Its really a detailed post for us to learn about it. These ideas can make the things good for us. By using the best ideas at this site https://www.twitch.tv/dunkinrunsonyou and here https://beacons.ai/dunkinrunsonyou I got to know about the best services that resolves the issues.

us, 2024/02/07 04:12

To store the collected data, among us the pyGI server utilizes a LevelDB instance, offering a lightweight and efficient solution for data storage.

Carlos Roberts, 2024/03/05 23:50

I recently had the pleasure of using this writing service, and I must say, the experience was exceptional. From start to finish, their professionalism shone through, delivering top-notch content that exceeded my expectations. What truly impressed me was their attention to detail and commitment to meeting deadlines. I found them through a glowing review at LinkedIn, and now I understand why they come highly recommended. If you're seeking quality writing services, look no further. I'll definitely be returning for future projects. Five stars all around!

kanecharles, 2024/04/04 07:37

Thank you for sharing useful information! By the way, if you have difficulty calculating your working hours or salary, time calculator is the perfect suggestion to help you solve that problem.

coreball, 2024/04/09 02:08

Excellent post. I wanted to let you know how much I have liked reading your writing since I recently came to your website.

larsenlola, 2024/04/10 08:28

In a computer system, the software is basically a set of instructions or commands that tell a computer what to do. In other words, the drift hunters software is a computer program that provides a set of instructions to execute a user's commands and tell the computer what to do.

LucyCoffee, 2024/04/16 09:57

The appeal of half body sexdollhttps://www.sexdolltech.com/product-category/shop-by-categories/sex-doll-body-type/torso-sex-dolls/ is that they represent a mature, confident, and attractive image of femininity that appeals to those who are looking for an easy-to-carry, on-the-go outlet

Enter your comment. Wiki syntax is allowed:
I᠎ O N G᠎ C
 
Trace: software

Page Tools