Dose calibration of Health Canada's Fixed Point Surveillance system for environmental radiation monitoring in terms of air kerma and H*(10)
| Autor: | Chuanlei Liu, Patrick R.B. Saull, Nicolas Martin-Burtart, Jens Hovgaard, Ed Korpach, Christopher Tulk, Kurt Ungar, Weihua Zhang |
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| Rok vydání: | 2022 |
| Předmět: |
History
Polymers and Plastics Health Toxicology and Mutagenesis Sodium Iodide General Medicine Radiation Dosage Pollution Industrial and Manufacturing Engineering Soil Radiation Monitoring Calibration Environmental Chemistry Business and International Management Monte Carlo Method Waste Management and Disposal |
| Zdroj: | Journal of Environmental Radioactivity. :107009 |
| ISSN: | 0265-931X |
| Popis: | The environmental radiation exposure in Canada has been monitored since 2002 by Health Canada's Fixed Point Surveillance network. The network consists of over eighty 7.6 cm × 7.6 cm sodium iodide spectrometers, and routinely reports to the public the environmental gamma radiation level throughout Canada. This paper describes the latest dose calibrations to air kerma and ambient dose equivalent for the future upgraded network. The calibration curves were developed using Monte Carlo techniques and further optimized via experiments in various reference fields. The dose calibration was validated over a wide range of gamma energy, dose measurement range, and angle of incidence under laboratory conditions. In environmental monitoring situations, the angular distribution of radiation exposure was analytically calculated by assuming a semi-infinite plume source, semi-infinite planar source, and infinite volume sources for the respective exposure scenarios of radioactive plume, ground contamination, and soil source. By coupling the resultant radiation angular distribution with detector's angular variation on dose response, the overall accuracy of dose measurement in each of these environmental scenarios was estimated. The accuracy is expected to be within ±3.7% for plume radiation, -5.6% for |
| Databáze: | OpenAIRE |
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