Possible inaccuracy in attenuation length for BC-420

[stealex]

Hello!

First of all, congratulations for the nice work!

I am by no means an expert on all of this so whatever is below might be a misunderstanding on my part. In that case, I apologize and I would be grateful for any clarification.

I've been trying to find the optical properties of BC-420 and I've stumbled upon this repository. While trying to get everything to work in my application, I started cross-checking the numerical values to make sure I understand everything properly. I am comparing entries of opsc-106 with the data I could find here
https://luxiumsolutions.com/radiation-detection-scintillators/plastic-scintillators/fast-timing-bc-418-bc-420-bc-422-bc-422q

Please correct me if I'm wrong but: the absorption length (light attenuation length) is stated in the datasheet as 140 cm. The repository uses 120 cm (https://github.com/mkandemirr/SSLG4/blob/main/sslg4/data/oscnt/opsc-106/absLength.txt).

[mkandemirr]

Hello, Thank you for taking the time to look carefully at the data and for letting me know. There are a couple of possible reasons for the difference you noticed: 1. *Simple copying error.* When the values were first entered, it’s possible that the 140 cm from the datasheet was accidentally recorded as 120 cm. 2. *Updated specifications.* Manufacturers occasionally revise the stated optical properties as measurements improve, so the current datasheet might differ from the one we originally used. Because these parameters can evolve, we designed the code so that you can change them at runtime without recompiling—none of the key values are hard-coded. If you’d like to adjust the attenuation length to 140 cm (or any other value), you can simply update the corresponding text file and rerun without rebuilding. Thanks again for catching this and for your interest in the repository. Best regards, Mustafa Kandemir stealex ***@***.***>, 28 Eyl 2025 Paz, 08:28 tarihinde şunu yazdı:

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*stealex* created an issue (mkandemirr/SSLG4#1) <#1> Hello! First of all, congratulations for the nice work! I am by no means an expert on all of this so whatever is below might be a misunderstanding on my part. In that case, I apologize and I would be grateful for any clarification. I've been trying to find the optical properties of BC-420 and I've stumbled upon this repository. While trying to get everything to work in my application, I started cross-checking the numerical values to make sure I understand everything properly. I am comparing entries of opsc-106 with the data I could find here https://luxiumsolutions.com/radiation-detection-scintillators/plastic-scintillators/fast-timing-bc-418-bc-420-bc-422-bc-422q Please correct me if I'm wrong but: the absorption length (light attenuation length) is stated in the datasheet as 140 cm. The repository uses 120 cm ( https://github.com/mkandemirr/SSLG4/blob/main/sslg4/data/oscnt/opsc-106/absLength.txt ). — Reply to this email directly, view it on GitHub <#1>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/A3MVBCBL26KXW4AF7HF27J33U5WWBAVCNFSM6AAAAACHWHFX42VHI2DSMVQWIX3LMV43ASLTON2WKOZTGQ3DCMJQGQ4TEOA> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

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