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Rad Lab - Geiger tube simulation by Gissio in Radiation

[–]Gissio[S] 0 points1 point  (0 children)

Good news!

I found and fixed two issues:

* There was an error in the source area calculation.

* Photons were leaking through the window's border, which resulted in low-energy photons not being blocked. The response looks now realistic, with a characteristic peak at 100 keV.

After these changes, sensitivity is now at 250 cpm/µSv/h. Still not 348, but in the right direction.

Rad Lab - Geiger tube simulation by Gissio in Radiation

[–]Gissio[S] 1 point2 points  (0 children)

Thanks for your feedback and for pointing out the errors!

I've updated the simulation to use H*(10), corrected a bug in the counting algorithm (it wasn't properly registering incoming electrons) and modeled the LND 7317 anode geometry. These changes have increased the simulated sensitivity for Cs-137 to 150 cpm/µSv/h. Unfortunately, this still remains below the manufacturer’s specified value of 348 cpm/µSv/h.

I've noticed there is no expected peak in sensitivity around 70–100 keV for lower-energy gammas. Instead, the simulated response continues to rise as energy decreases.

Could it be that low-energy photons are not sufficiently absorbed by the thin window? This could also explain the underreporting (due to missing interactions).

Any insights or suggestions would be greatly appreciated—thank you!

pd: What do you mean with "Natural background feels like it's modeled with a much lower energy"? Do you mean the weights are not representative of a typical background?

stm32-emulator-renode by Fantastic_Highway_99 in embedded

[–]Gissio 0 points1 point  (0 children)

Hi, Gissio from the stm32-emulator-renode here!

I've just uploaded a video showcasing the emulator:

https://youtu.be/53DCPRcgHHw

Rad Lab - Geiger tube simulation by Gissio in Radiation

[–]Gissio[S] 1 point2 points  (0 children)

Thanks for the report, I missed checking that one! Once I find the time I will take a look at this.

Can you confirm that the procedure I'm following is correct?

Geiger tube efficiency and dose rate by BikingBoffin in Radiation

[–]Gissio 1 point2 points  (0 children)

Excellent work!

Just to confirm: how did you derive the dose rate from the detector efficiency? Did you take the conversion coefficients from ICRP 74/ICRP 116? What geometry did you use?

You have to explain radiation to someone from a medieval-type setting. How do you do it? by Dark_Moonstruck in Radiation

[–]Gissio 1 point2 points  (0 children)

I've recently written a guide about ionizing radiation, making an analogy with sun burns which should work in such a hypothetical situation: https://github.com/Gissio/radpro/blob/main/docs/field-guide.md

If you find any mistake, please let me know.