OpenDosimeter: Open Hardware Personal X-ray Dosimeter
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arXiv
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| Autori principali: | , , , , , , , , , , |
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| Natura: | Preprint |
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2024
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| _version_ | 1866917137604411392 |
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| author | Ger, Norah Ku, Alice Lopez, Jasmyn Bennett, N. Robert Wang, Jia Ateka, Grace Anyenda, Enoch Rosezky, Matthias Kilavi, Pamela Wang, Adam S. Shaker, Kian |
| author_facet | Ger, Norah Ku, Alice Lopez, Jasmyn Bennett, N. Robert Wang, Jia Ateka, Grace Anyenda, Enoch Rosezky, Matthias Kilavi, Pamela Wang, Adam S. Shaker, Kian |
| contents | We present OpenDosimeter (www.opendosimeter.org), an open hardware solution for real-time personal X-ray dose monitoring based on a scintillation counter. Using an X-ray sensor assembly (LYSO + SiPM) on a custom board powered by a Raspberry Pi Pico, OpenDosimeter provides real-time feedback (1 Hz), data logging (10 hours), and battery-powered operation. One of the core innovations is that we calibrate the device using $^{241}$Am found in ionization smoke detectors. Specifically, we use the $γ$-emissions to spectrally calibrate the dosimeter, then calculate the effective dose from X-ray exposure by compensating for the scintillator absorption efficiency and applying energy-to-dose coefficients derived from tabulated data in the ICRP 116 publication. We demonstrate that this transparent approach enables real-time dose rate readings with a linear response between 0.1-1000 $μ$Sv/h at $\pm$25% accuracy, tested for energies up to 120 keV. The maximum dose rate readings are limited by pile-up effects when approaching count rate saturation ($\sim$77 kcps at $\sim$13 $μ$s average pulse processing time). The total component cost for making an OpenDosimeter is <\$100, which, combined with its open design (both hardware and software), enables cost-effective local reproducibility on a global scale. Through a student workshop, we also demonstrate its effectiveness as an educational and capacity-building tool. This paper complements the open-source documentation by explaining the underlying technology, the algorithm for dose calculation, and areas for future improvement. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_09993 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | OpenDosimeter: Open Hardware Personal X-ray Dosimeter Ger, Norah Ku, Alice Lopez, Jasmyn Bennett, N. Robert Wang, Jia Ateka, Grace Anyenda, Enoch Rosezky, Matthias Kilavi, Pamela Wang, Adam S. Shaker, Kian Instrumentation and Detectors Medical Physics We present OpenDosimeter (www.opendosimeter.org), an open hardware solution for real-time personal X-ray dose monitoring based on a scintillation counter. Using an X-ray sensor assembly (LYSO + SiPM) on a custom board powered by a Raspberry Pi Pico, OpenDosimeter provides real-time feedback (1 Hz), data logging (10 hours), and battery-powered operation. One of the core innovations is that we calibrate the device using $^{241}$Am found in ionization smoke detectors. Specifically, we use the $γ$-emissions to spectrally calibrate the dosimeter, then calculate the effective dose from X-ray exposure by compensating for the scintillator absorption efficiency and applying energy-to-dose coefficients derived from tabulated data in the ICRP 116 publication. We demonstrate that this transparent approach enables real-time dose rate readings with a linear response between 0.1-1000 $μ$Sv/h at $\pm$25% accuracy, tested for energies up to 120 keV. The maximum dose rate readings are limited by pile-up effects when approaching count rate saturation ($\sim$77 kcps at $\sim$13 $μ$s average pulse processing time). The total component cost for making an OpenDosimeter is <\$100, which, combined with its open design (both hardware and software), enables cost-effective local reproducibility on a global scale. Through a student workshop, we also demonstrate its effectiveness as an educational and capacity-building tool. This paper complements the open-source documentation by explaining the underlying technology, the algorithm for dose calculation, and areas for future improvement. |
| title | OpenDosimeter: Open Hardware Personal X-ray Dosimeter |
| topic | Instrumentation and Detectors Medical Physics |
| url | https://arxiv.org/abs/2409.09993 |