Study of the radioactivity induced in air by a 15-MeV proton beam
| Autor: | Antonio Ereditato, Paola Scampoli, Konrad Pawel Nesteruk, Kevin Zihlmann, Saverio Braccini |
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| Přispěvatelé: | S., Braccini, A., Ereditato, K. P., Nesteruk, Scampoli, Paola, K., Zihlmann |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Materials science
Proton 530 Physics Cyclotron Radiation Dosage Sensitivity and Specificity law.invention Nuclear physics Isotopes law Radiation Monitoring Radiology Nuclear Medicine and imaging Beam dump Irradiation Range (particle radiation) Radiation Radiological and Ultrasound Technology Isotope business.industry Air Radiochemistry Public Health Environmental and Occupational Health Reproducibility of Results General Medicine Cyclotrons Air Pollutants Radioactive Radiation protection Protons business Beam (structure) |
| DOI: | 10.7892/boris.83520 |
| Popis: | Radioactivity induced by a 15-MeV proton beam extracted into air was studied at the beam transport line of the 18-MeV cyclotron at the Bern University Hospital (Inselspital). The produced radioactivity was calculated and measured by means of proportional counters located at the main exhaust of the laboratory. These devices were designed for precise assessment of air contamination for radiation protection purposes. The main produced isotopes were (11)C, (13)N and (14)O. Both measurements and calculations correspond to two different irradiation conditions. In the former, protons were allowed to travel for their full range in air. In the latter, they were stopped at the distance of 1.5 m by a beam dump. Radioactivity was measured continuously in the exhausted air starting from 2 min after the end of irradiation. For this reason, the short-lived (14)O isotope gave a negligible contribution to the measured activity. Good agreement was found between the measurements and the calculations within the estimated uncertainties. Currents in the range of 120-370 nA were extracted in air for 10-30 s producing activities of 9-22 MBq of (11)C and (13)N. The total activities for (11)C and (13)N per beam current and irradiation time for the former and the latter irradiation conditions were measured to be (3.60 ± 0.48) × 10(-3) MBq (nA s)(-1) and (2.89 ± 0.37) × 10(-3) MBq (nA s)(-1), respectively. |
| Databáze: | OpenAIRE |
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