{"id":26325,"date":"2024-05-27T17:08:03","date_gmt":"2024-05-27T15:08:03","guid":{"rendered":"https:\/\/www.revistanuclear.es\/?p=26325"},"modified":"2024-05-28T15:27:53","modified_gmt":"2024-05-28T13:27:53","slug":"study-of-the-activation-of-shielding-in-proton-therapy-centers-depending-on-the-type-of-concrete-utm_sourcenewsletterutm_mediummailchimp","status":"publish","type":"post","link":"https:\/\/www.revistanuclear.es\/en\/more\/study-of-the-activation-of-shielding-in-proton-therapy-centers-depending-on-the-type-of-concrete-utm_sourcenewsletterutm_mediummailchimp\/","title":{"rendered":"Study of the activation of shielding in proton therapy centers depending on the type of concrete"},"content":{"rendered":"
\"\"<\/span>SEE FULL VERSION<\/span><\/a>
<\/div>P<\/span>roton therapy has a growing potential in the treatment of some types of tumours and, consequently, in the last decade, proton therapy centers are increasing rapidly around the world, with great prominence in Spain, where there are already two private centers in operation, and there are eleven new public center projects in various phases of planning and construction. In these facilities, immediate radiation attenuation through appropriate shielding is necessary to meet dose limits, but not sufficient for efficient radiation protection. The activation of mechanical elements (accelerator, beam devices), environmental elements (air, water, terrain), and of course, shielding, is another relevant topic, linked to the safety conditions of radiation protection, as well as, especially, to the future decommissioning and management of radioactive waste produced throughout the operation of the facility. The induced radioactivity remains in the walls of the centers for several years, even decades, after their closure, therefore, a good estimate of the inventory, depending on the choice of shielding material, could be advisable in the early stages of the projects. To estimate and reduce dismantling costs, which represent a sensitive part of the total investment, it is essential to study the complete life cycle of the installation.<\/span><\/p>\n

Consequently, the objective of this work has been to describe the process to evaluate the activation in the shielding of proton centers, comparing four different types of concrete, conventional <\/span>Portland<\/span><\/i> (<\/span>HPOR<\/span><\/i>), high density with magnetite (<\/span>HMAG<\/span><\/i>), high content in hydrogen with colemanite (<\/span>HCOL<\/span><\/i>), and finally, low activation (<\/span>HBA1<\/span><\/i>). The study has been carried out using <\/span>Monte Carlo Codes<\/span><\/i> (<\/span>MCNP and PHITS<\/span><\/i>), and selecting different nuclear data libraries and physical models, considering the energy of the neutrons present, <\/span>up to 230 MeV<\/span><\/i>, and the generation of radioisotopes both by capture and spallation reactions. The complete work includes the study of the activation of the three types of centers planned for Spain, but this summary includes only the facilities with synchrocyclotron, which will be the type of technology mostly used, in eleven of the thirteen planned centers (ten public and one private).<\/span><\/p>\n

The shielding selected must attenuate immediate or prompt radiation below regulatory limits, using materials with low level of activation, to reduce the exposition to gamma radiation of the professional staff of the center and that generate low radioactive waste. The overall cost should be the lowest possible, considering both the start-up cost and the dismantling cost depending on the volume of waste generated. The choice of shielding material could then be made, considering several requirements and parameters: 1) Attenuate the immediate radiation below the regulatory dose limits; 2) Reduce exposure to gamma radiation from the activation of the enclosures, both to clinical staff and to patients and the general public; 3) Generate the smallest amount of radioactive waste possible; 4) Optimize the cost of construction and dismantling together. As the neutron spectrum varies significantly in each area of the center, one proposal would be to use different concretes in different areas, optimizing the selection based on, for example, parameters such as attenuation, activation, and cost.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

roton therapy has a growing potential in the treatment of some types of tumours and, consequently, in the last decade, proton therapy centers are increasing rapidly around the world, with great prominence in Spain, where there are already two private centers in operation, and there are eleven new public center projects in various phases of planning and construction. In these facilities, immediate radiation attenuation through appropriate shielding is necessary to meet dose limits, but not sufficient for efficient radiation protection. […]<\/p>\n","protected":false},"author":1602,"featured_media":26303,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"mc4wp_mailchimp_campaign":[],"footnotes":""},"categories":[1585],"tags":[3479,1707,3392],"coauthors":[3482,3485,3486,3488],"class_list":["post-26325","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-more","tag-activation-of-armor-plating","tag-desmantelamiento-en","tag-proton-therapy"],"acf":[],"yoast_head":"\nStudy of the activation of shielding in proton therapy centers depending on the type of concrete - More...<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.revistanuclear.es\/en\/more\/study-of-the-activation-of-shielding-in-proton-therapy-centers-depending-on-the-type-of-concrete-utm_sourcenewsletterutm_mediummailchimp\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Study of the activation of shielding in proton therapy centers depending on the type of concrete - More...\" \/>\n<meta property=\"og:description\" content=\"roton therapy has a growing potential in the treatment of some types of tumours and, consequently, in the last decade, proton therapy centers are increasing rapidly around the world, with great prominence in Spain, where there are already two private centers in operation, and there are eleven new public center projects in various phases of planning and construction. In these facilities, immediate radiation attenuation through appropriate shielding is necessary to meet dose limits, but not sufficient for efficient radiation protection. 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