Dismantling Work and Radiation Measurement of Used Accelerator Facility. Evaluation of Radioactivities Induced in the Shielding of the Neutron Scattering Fascility and Its Decomssioning.

Masumoto, K.; Ohtsuki, T.; Kasagi, J.; Izumi, Yuichi; Yamato, Ichiro

doi:10.5453/jhps.34.151

Cited by 6 publications

(1 citation statement)

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“…The handling of this residual radioactivity has become an issue in radiation safety [3]. Therefore, evaluating the residual radioactivity in a cyclotron, in indoor air, and in concrete has become an essential task in relation to protecting indoor workers from radiation and decommissioning countermeasures [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Measurement of thermal neutron fluence distribution with use of 23Na radioactivation around a medical compact cyclotron

Yamaguchi

Kasahara

Iimori

et al. 2009

Radiol Phys Technol

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A medical compact cyclotron produces about 10(15) neutrons per day along with 100 GBq of (18)F. Therefore, it is important to establish radiation safety guidelines on residual radioactivity for routine operation, maintenance work, and decommissioning. Thus, we developed a simple method for measuring the thermal neutrons in a cyclotron room. In order to verify the feasibility of our proposed method, we measured the thermal neutron distribution around a cyclotron by using the activation of (23)Na in salt. We installed 78 salt dosimeters in the cyclotron room with a 50 cm mesh. The photopeak of (24)Na was measured, and the neutron flux distribution was estimated. Monitoring the neutron flux distribution in a cyclotron room appears to be useful for not only obtaining an accurate estimate of the distribution of induced radioactivity, but also optimizing the shield design for radiation safety in preparation for the decommissioning process.

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Section: Introductionmentioning

confidence: 99%