Fun stuff

[Gissio]

Curious: https://youtu.be/MSY9H6ahNa8

[Daniel910310]

My friend, how do I reset cumulative on GC-01 with your software? Your software is best, i love it.

[dc1rdb]

Push and hold left arrow key

[Daniel910310]

Thank you :) very much ;) Dňa ne 16. 2. 2025, 14:00 Robert ***@***.***> napísal(a):

…

Push and hold left arrow key — Reply to this email directly, view it on GitHub <#207 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BPR4XXNBCB3LNWFKUUO744T2QCDVZAVCNFSM6AAAAABXEFTO32VHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTEMRRGUYTGMI> . You are receiving this because you commented.Message ID: ***@***.***>

[Daniel910310]

I don't want to be rude, but I would really appreciate it if it were possible to add the battery status in percentage and the battery charging progress. That would be awesome! :) Dňa ne 16. 2. 2025, 14:07 SVK PSYCHOPATH ***@***.***> napísal(a):

…

Thank you :) very much ;) Dňa ne 16. 2. 2025, 14:00 Robert ***@***.***> napísal(a): > Push and hold left arrow key > > — > Reply to this email directly, view it on GitHub > <#207 (reply in thread)>, > or unsubscribe > <https://github.com/notifications/unsubscribe-auth/BPR4XXNBCB3LNWFKUUO744T2QCDVZAVCNFSM6AAAAABXEFTO32VHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTEMRRGUYTGMI> > . > You are receiving this because you commented.Message ID: > ***@***.***> >

[Gissio]

That’s not an good idea.

The problem is that batteries in Geiger counters are produced by different manufacturers, each with unique discharge profiles. These profiles are also affected by factors like temperature and battery wear. That’s why Rad Pro’s battery indicator is simplified to just four bars, providing a general estimate.

In contrast, mass-produced devices like smartphones benefit from a more controlled environment. Manufacturers can precisely measure and calibrate the battery’s discharge profile—even accounting for temperature and wear.

For more detail, check the battery voltage in the statistics menu.

[Daniel910310]

Thank you very much for your reply! :) How can I calibrate the device as accurately as possible? Dňa pi 21. 2. 2025, 7:21 Gissio ***@***.***> napísal(a):

…

That’s not an good idea. The problem is that batteries in Geiger counters are produced by different manufacturers, each with unique discharge profiles. These profiles are also influenced by factors like temperature and battery wear. That’s why Rad Pro’s battery indicator is simplified to just four bars, providing a general estimate. In contrast, mass-produced devices like smartphones benefit from a more controlled environment. Manufacturers can precisely measure and calibrate the battery’s discharge profile—accounting for temperature and wear. For more detail, check the battery voltage in the statistics menu. — Reply to this email directly, view it on GitHub <#207 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BPR4XXI2TRKHZQZUCZODXVL2Q3AXDAVCNFSM6AAAAABXEFTO32VHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTEMRXGIYDKNQ> . You are receiving this because you commented.Message ID: ***@***.***>

[Gissio]

What do you mean?

[Daniel910310]

My device is Joy-IT JT RAD 01 IS HAVE BETTER CONSTRUCTION KVALITY Dňa pi 21. 2. 2025, 8:17 SVK PSYCHOPATH ***@***.***> napísal(a):

…

Calibration of the dosimeter for radiation measurement I have osciloscope too for messaure dead time tube i have J321 tube Dňa pi 21. 2. 2025, 8:14 Gissio ***@***.***> napísal(a): > What do you mean? > > — > Reply to this email directly, view it on GitHub > <#207 (reply in thread)>, > or unsubscribe > <https://github.com/notifications/unsubscribe-auth/BPR4XXORDI6C356KOQBFRZL2Q3G6NAVCNFSM6AAAAABXEFTO32VHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTEMRXGI2DEOA> > . > You are receiving this because you commented.Message ID: > ***@***.***> >

[Gissio]

Nerozumiem ti.

[Daniel910310]

"I would like to calibrate the device for radiation." Dňa pi 21. 2. 2025, 8:24 Gissio ***@***.***> napísal(a):

…

Nerozumiem ti. — Reply to this email directly, view it on GitHub <#207 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BPR4XXJX7EUHCFMSGIDUI6D2Q3IB5AVCNFSM6AAAAABXEFTO32VHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTEMRXGI2TENY> . You are receiving this because you commented.Message ID: ***@***.***>

[DG0MG]

If you select the appropriate Geiger tube that is installed in your device under "Conversion Factor" in the menu, that is sufficient. It simply makes no sense to try to measure the Doe rate "highly precisely" with such small, uncompensated counter tubes. Compare that with the voltage that the lead battery in your car has: whether it has 12.1 volts or 12.9 volts still makes a big difference. But whether it has 12,851 or 12,853 volts is completely irrelevant. But of course you can measure this with a suitable measuring device.
In addition, the calibration factor for the Chinese counter tubes is only known for Co-60, and for Russian counter tubes only for Cs-137. Since the counter tubes are not compensated (which is a big science), the dose rate is only correct for the specified nuclide. With lower energy, there is a greater probability of response - so the dose rates for Ra-226 or U-nat (pitchblende), for example, are displayed too high. The problem cannot be solved without changing the hardware. Energy-compensated counter tubes cost more individually than 5-10 Chinese Geiger counters, and the devices equipped with them cost more. In return, they can be calibrated and the dose rate is correct over a wider energy range.

[Daniel910310]

"Thank you for the information you provided and also for your time dedicated to the development of this meter. I believe that for informational purposes, the meter is good, and even if radiation levels in the air increase, at least a person has some information about it." Dňa pi 21. 2. 2025, 10:57 Steffen ***@***.***> napísal(a):

…

If you select the appropriate Geiger tube that is installed in your device under "Conversion Factor" in the menu, that is sufficient. It simply makes no sense to try to measure the Doe rate "highly precisely" with such small, uncompensated counter tubes. Compare that with the voltage that the lead battery in your car has: whether it has 12.1 volts or 12.9 volts still makes a big difference. But whether it has 12,851 or 12,853 volts is completely irrelevant. But of course you can measure this with a suitable measuring device. In addition, the calibration factor for the Chinese counter tubes is only known for Co-60, and for Russian counter tubes only for Cs-137. Since the counter tubes are not compensated (which is a big science), the dose rate is only correct for the specified nuclide. With lower energy, there is a greater probability of response - so the dose rates for Ra-226 or U-nat (pitchblende), for example, are displayed too high. The problem cannot be solved without changing the hardware. Energy-compensated counter tubes cost more individually than 5-10 Chinese Geiger counters, and the devices equipped with them cost more. In return, they can be calibrated and the dose rate is correct over a wider energy range. — Reply to this email directly, view it on GitHub <#207 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BPR4XXPHV5GSZYEIT6XOOG32Q32CFAVCNFSM6AAAAABXEFTO32VHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTEMRXGQYDSMY> . You are receiving this because you commented.Message ID: ***@***.***>

[STGitUser]

It is a common misunderstanding that Geiger Counters can also be used as dosimeters. A Geiger counter by nature is not capable of accurately measuring radiation dosage rates in any normal situation. Particles across a wide range of energies all cause the same avalanche in a GM tube. The tube can only be used to measure a count not accurately measure particle energy. Scintillation crystal-based counters can measure dosage because the energy of the photon is proportional to that of the decay particle that released it.

[Gissio]

Thanks for pointing this out. I think this should be clearly stated in the manual.

[DG0MG]

But it is also not true to say that you cannot measure a correct dose using counter tubes. After all, many commercial dose measuring devices have a Geiger-Müller counter tube built in. But as already mentioned: They have a special design feature: they are energy compensated. They have a uniform response sensitivity over a wide energy range.

But it is true for the few devices supported by RadPro: Due to their design, the devices are not suitable for measuring a correct dose or a correct dose rate if the nuclide is not known.

[Daniel910310]

Hi, probably a stupid question, but why when I set the dead time of the tube, for example, to 176 which I measured after long-term testing, I turn on the device and the dead time is reset and starts from some large numbers in the statistics? When I look at that number, it decreases from a large value. Do you know what is the maximum value that can be measured with this device? And thank you very much for the 2.1.1 update and your time :) Dňa ut 25. 2. 2025, 9:25 Steffen ***@***.***> napísal(a):

…

But it is also not true to say that you cannot measure a correct dose using counter tubes. After all, many commercial dose measuring devices have a Geiger-Müller counter tube built in. But as already mentioned: They have a special design feature: they are energy compensated. They have a uniform response sensitivity over a wide energy range. But it is true for the few devices supported by RadPro: Due to their design, the devices are not suitable for measuring a correct dose or a correct dose rate if the nuclide is not known. — Reply to this email directly, view it on GitHub <#207 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BPR4XXKMK5B6UA6CFBBXIG32RQSJJAVCNFSM6AAAAABXEFTO32VHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTEMZRGAYDSNQ> . You are receiving this because you commented.Message ID: ***@***.***>

[DG0MG]

With regard to dead-time compensation, there are two INDEPENDENT processes:

1. First, the MEASUREMENT of the counter tube's dead time. You measure the time between two pulses and note it. For the next measurements between pulses, you check each time to see if the time was SHORTER than the previously noted time. If so, you note this shorter time. Once you've done this often enough, this time approaches a certain value, which then no longer decreases. This is the dead time of the counter tube: the shortest interval between two consecutive pulses. This occurs because the gas volume in the counter tube must first "recover" after ignition and extinguishing before the next quantum can be detected (simplified). This dead time measurement (under Statistics) is, of course, restarted after each power-on.
2. Second: The dead time correction itself. In the low dose rate range, the count rate (in cpm) and dose rate (in µSv/h) are proportional: For example: 10 cpm = 0.1 µSv/h, 100 cpm = 1 µSv/h, 1000 cpm = 10 µSv/h, and so on. If the dead time of a counter tube is, for example, 100 µsec (0.0001 sec), it is logical that it cannot deliver more than 1/0.0001 sec of pulses, i.e. 10,000 per second or 600,000 per minute. Therefore, the higher the measured dose rate, the closer I get to this limit. Even if I have not yet reached this limit, the probability increases that two pulses that should have been counted individually will be registered as one because their separation was shorter than the dead time. This results in the actual dose rate being displayed lower than it actually is. This can be corrected with the dead time correction: a factor >1, depending on the count rate, by which the determined dose rate is additionally multiplied to approximate the actual dose rate.

I have now determined a dead time of <58 µsec with an active mineral. Without the dead time correction, it is 16.32 µSv/h; with a set dead time correction in the "Geiger tube"-item, it is 16.38 µSv/h in the Average and 5%. These approximately 2500 cpm are therefore still far too low for the dead time to play a role.

The manufacturer itself specifies an upper limit of 50 mSv/h for the FS-5000: https://bosean.net/FS-5000-Nuclear-Radiation-Detector-2.html

The conversion factor for the J321 counter tube is 153.8 cpm/µSv/h: https://github.com/Gissio/radpro/blob/main/docs/manual.md#sensitivity

At 50 mSv/h (50,000 µSv/h), this would be 7,690,000 cpm or 128,166 cps. A dead time of <7 µsec would be necessary to distinguish the pulses. So, I would say the upper limit of 50 mSv/h is incorrect; it's much smaller. Perhaps 5 or 10 mSv/h. But these are not values ​​you would want to measure with a Chinese measuring device... ;)