Shielding design for a proton medical accelerator facility

Journal Article · Mon Apr 01 04:00:00 EST 1996 · IEEE Transactions on Nuclear Science

DOI:https://doi.org/10.1109/23.491521· OSTI ID:248092

Agosteo, S ^[1]; Corrado, M G ^[2]; Silari, M ^[3]; Tabarelli de Fatis, P ^[4]

---

1. Politecnico di Milano (Italy). Dipt. di Ingegneria Nucleare
2. Univ. di Milano (Italy). Dipt. di Fisica
3. Consiglio Nazionale delle Ricerche, Milano (Italy). Ist. Tecnologie Biomediche Avanzate
4. Fondazione TERA, Novara (Italy)

Source terms and attenuation lengths for neutrons produced by 250 MeV protons on iron, copper and soft tissue, calculated with the FLUKA Monte Carlo code, were used for the shielding calculations (walls, ceilings, and floors) for the National Centre for Oncological Hadrontherapy to be built in Italy. Appropriate hypotheses on the proton current, beam loss factors, duty factors, occupancy factors and use factors of the shields were adopted. A dose equivalent limit of 1 mSv per year in the areas where the public has access and of 2 mSv per year for facility personnel were assumed. Shielding requirements vary from 1.5 m to about 4 m of ordinary concrete. The results agree with Monte Carlo simulations of the complete geometry of the facility obtained in a previous work. The access mazes to the treatment rooms were designed by the LCS Monte Carlo code by optimizing the length and section of their legs and their wall thicknesses with the dose equivalent limit of 2 mSv per year, fixed in the areas accessed by personnel. The resulting annual neutron dose equivalent at the maze mouth is 0.6 mSv.

• OSTI ID: 248092
• Journal Information: IEEE Transactions on Nuclear Science, Journal Name: IEEE Transactions on Nuclear Science Journal Issue: 2Pt2 Vol. 43; ISSN IETNAE; ISSN 0018-9499
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
55 BIOLOGY AND MEDICINE
BASIC STUDIES
ACCELERATOR FACILITIES
BEAM CURRENTS
BEAM TRANSPORT
BIOLOGICAL SHIELDS
DESIGN
ENERGY LOSSES
MEDICAL ESTABLISHMENTS
NEOPLASMS
RADIOTHERAPY