On the influence of the cyclotron components and concrete vault room on the neutron radiation field around the accelerator
Creators
- 1. Comissao Nacional de Energia Nuclear, Centro de Desenvolvimento da Tecnologia Nuclear, Campus da UFMG, Pampulha, 31270-901 Belo Horizonte, Minas Gerais (Brazil)
- 2. Universidad Autonoma de Zacatecas, Unidad Academica de Estudios Nucleares, Cipres No. 10, Fracc. La Penuela, 98068 Zacatecas, Zac. (Mexico)
Description
In a cyclotron facility, the knowledge of the radiation field around the accelerator is an important issue for shielding planning and optimization of the radiation protection of the workers and individuals of the public. Neutrons emitted by the cyclotron contribute not only to radiation dose fields around the accelerator due to activation of cyclotron components and the concrete in the bunker walls, as well as, the dispersal of radioactive gases produced by activation of the air inside the cyclotron vault. In this work, the Monte Carlo code MCNPX was used to assess the influence of the components of the unshielded Ge-PET trace-8 cyclotron and the concrete vault room in the neutron radiation field during 18F production. A new radiation source term from the bombardment of 18O-enriched water target with protons of 16.5 MeV was used. MCNPX simulations were performed for six different cases, i.e., combining the radiation source term, the accelerator, the components of the accelerator and the cyclotron bunker. The neutron radiation field mapping in terms of the thermal, epithermal and fast neutron fluence rate was performed at seven specific points located inside and outside of the cyclotron vault room defined in a previous work. Results show how the components of the accelerator and the concrete vault room alter significantly the spectral distribution of the neutron fluence and equivalent dose rates around the cyclotron. (Author)
Files
51012359.pdf
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(2.4 MB)
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Additional details
Publishing Information
- Publisher
- Sociedad Mexicana de Irradiacion y Dosimetria
- Imprint Place
- Ciudad de Mexico (Mexico)
- Imprint Pagination
- 31 p.
- Report number
- INIS-MX--3254
Conference
- Title
- 18. international symposium on solid state dosimetry
- Acronym
- ISSSD 2018
- Dates
- 24-28 Sep 2018
- Place
- Oaxaca, Oax. (Mexico)
INIS
- Country of Publication
- Mexico
- Country of Input or Organization
- Mexico
- INIS RN
- 51012359
- Subject category
- S07: ISOTOPES AND RADIATION SOURCES; S73: NUCLEAR PHYSICS AND RADIATION PHYSICS;
- Resource subtype / Literary indicator
- Conference
- Quality check status
- Yes
- Descriptors DEI
- AIR; CONCRETES; CYCLOTRONS; DOSE EQUIVALENTS; DOSE RATES; FAST NEUTRONS; FLUORINE 18; HOPPERS; MEV RANGE; MONTE CARLO METHOD; NEUTRON FLUENCE; OXYGEN 18; POSITRON COMPUTED TOMOGRAPHY; PROTONS; RADIATION DOSES; RADIATION PROTECTION; RADIATION SOURCES; SHIELDING; SOURCE TERMS; WATER;
- Descriptors DEC
- ACCELERATORS; BARYONS; BETA DECAY RADIOISOTOPES; BETA-PLUS DECAY RADIOISOTOPES; BUILDING MATERIALS; CALCULATION METHODS; COMPUTERIZED TOMOGRAPHY; CONTAINERS; CYCLIC ACCELERATORS; DIAGNOSTIC TECHNIQUES; DOSES; ELEMENTARY PARTICLES; EMISSION COMPUTED TOMOGRAPHY; ENERGY RANGE; EVEN-EVEN NUCLEI; FERMIONS; FLUIDS; FLUORINE ISOTOPES; GASES; HADRONS; HOURS LIVING RADIOISOTOPES; HYDROGEN COMPOUNDS; ISOMERIC TRANSITION ISOTOPES; ISOTOPES; LIGHT NUCLEI; MATERIALS; NANOSECONDS LIVING RADIOISOTOPES; NEUTRONS; NUCLEI; NUCLEONS; ODD-ODD NUCLEI; OXYGEN COMPOUNDS; OXYGEN ISOTOPES; RADIOISOTOPES; STABLE ISOTOPES; TOMOGRAPHY;