Study of the radioactivity induced in air by a 15-MeV proton beam.

Braccini, Saverio; Ereditato, Antonio; Nesteruk, Konrad Pawel; Scampoli, Paola; Zihlmann, Kevin (2015). Study of the radioactivity induced in air by a 15-MeV proton beam. Radiation protection dosimetry, 163(3), pp. 269-275. Oxford University Press 10.1093/rpd/ncu199

[img] Text
269.full.pdf - Published Version
Restricted to registered users only
Available under License Publisher holds Copyright.

Download (502kB) | Request a copy
[img]
Preview
Text
ncu199.pdf - Other
Available under License Publisher holds Copyright.

Download (501kB) | Preview

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 11C, 13N and 14O. 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 14O 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 11C and 13N. The total activities for 11C and 13N 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.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP)

UniBE Contributor:

Braccini, Saverio; Ereditato, Antonio; Nesteruk, Konrad Pawel; Scampoli, Paola and Zihlmann, Kevin

Subjects:

500 Science > 530 Physics

ISSN:

0144-8420

Publisher:

Oxford University Press

Language:

English

Submitter:

Tommaso Stefano Carzaniga

Date Deposited:

24 Jun 2016 08:51

Last Modified:

25 Oct 2019 21:19

Publisher DOI:

10.1093/rpd/ncu199

BORIS DOI:

10.7892/boris.83520

URI:

https://boris.unibe.ch/id/eprint/83520

Actions (login required)

Edit item Edit item
Provide Feedback