Analysis of induced radionuclides in replacement parts and liquid wastes in a medical cyclotron solely used for production of 18F for [18F]FDG

Mochizuki, S.; Ishigure, Nobuhito; Ogata, Yoshiro; Kobayashi, Takayuki

doi:10.1016/j.apradiso.2013.01.004

Cited by 7 publications

(3 citation statements)

References 14 publications

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“…Theoretical investigation showed 627 nuclear reactions possible 13 but practical results limited the number of isotopes to principal radionuclides and primary proton beam interaction. As dominating, (p,n) reactions on naturally occurring isotopes are generally proposed 12,14,16,22 with (p,␣) 12,16,22 and (n,␣), (n,␥) 22 supplementary paths.…”

Section: Radionuclidic Puritymentioning

confidence: 99%

Synthesis, quality control and determination of metallic impurities in 18F-fludeoxyglucose production process

Kilian

Chabecki

Kiec

et al. 2014

Reports of Practical Oncology & Radiotherapy

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Section: Radionuclidic Puritymentioning

confidence: 99%

Synthesis, quality control and determination of metallic impurities in 18F-fludeoxyglucose production process

Kilian

Chabecki

Kiec

et al. 2014

Reports of Practical Oncology & Radiotherapy

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“…6 They found that a longer operation period resulted in more radionuclides with longer, rather than shorter half-lives. 6 Therefore, the generated radionuclides and their radioactivity concentrations depended on the energy of accelerated particles, 23 atomic composition 24 and the durations of the operating and cooling periods. [6][7][8]25 The maximum amount of concrete estimated as radioactivated waste in the present study was 70,000 kg.…”

Section: Discussionmentioning

confidence: 99%

Pre‐discard estimation of radioactivated materials in positron emission tomography cyclotron systems and concrete walls of a cyclotron vault

Wagatsuma

Ishiwata

Nobuhara³

et al. 2019

Medical Physics

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Purpose The concrete vault, cyclotron body, and peripheral equipment in a cyclotron room become radioactivated by neutrons generated by operating an unshielded cyclotron. Radionuclides and the amounts of radioactivated materials must be identified before discarding a cyclotron system. The present study aimed to reduce the amounts of concrete from cyclotron vaults, as well as cyclotron components and peripheral equipment, that will be disposed of as radioactivated waste by clarifying the nature and quantity of radioactivated materials remaining in facilities after cyclotron operations have ceased. Methods Cylindrical concrete cores were bored into all four walls, ceiling, and floor of a room where a Cypris 370 cyclotron had been operated for 22.8 yr and then cooled for 40 months. The accelerated particles comprised protons and deuterons with constant energy of 18 and 10 MeV, respectively. The types and amounts of radionuclides in these cores, in 38 components of the cyclotron including the yoke, and in 13 pieces of equipment in the room, were determined by γ‐ray spectrometry. Concentrations of radioactivity were also calculated using an updated version of Particle and Heavy Ion Transport System and DCHAIN‐SP. Amounts of materials with both measured and calculated total radioactivity concentration (ΣD) of <0.1 Bq/g were identified as being nonradioactivated. Results The major radionuclides in the concrete were 60Co and 152Eu. The radioactivated concrete was distributed to a depth of <38 cm. Most cyclotron components and equipment were radioactivated by neutrons. The major radionuclides in cyclotron components and equipment were 54Mn, 60Co, and 65Zn. A 33% volume of the yoke was regarded as nonradioactivated. Conclusions The estimated amount of radioactivated waste in the concrete was about 70,000 kg (12.5% of the total concrete). Most components of the cyclotron except for the 33% volume of the yoke (20% of the cyclotron body), as well as most peripheral equipment in the room, were radioactivated. Part‐by‐part assessments of radioactive materials using measurements and calculations could distinguish nonradioactive from radioactive materials before they are discarded.

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“…En plus des radionucléides destinés au domaine radiopharmaceutique ou à la recherche, des radionucléides non souhaités dits « parasites », tels que l'argon 41 et l'azote 13, sont produits respectivement par activation de l'air et par des réactions secondaires dues à la présence d'oxygène 16 dans la cible (Garnir, 2009 ;Varmenot, 2010 ;Mochizuki et al, 2013 ;Braccini et al, 2014). Toutefois, d'après cette première étude, il semblerait que les radionucléides parasites soient émis dans de faibles proportions par rapport aux radionucléides objets de la production.…”

Section: Caractéristiques De Production Des Radionucléidesunclassified

État des lieux en France des rejets radioactifs gazeux émis par les installations détenant un cyclotron

2017

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-Cette étude concerne les effluents gazeux émis par les installations de fabrication de radionucléides au moyen d'un cyclotron. Un questionnaire élaboré par l'IRSN/UES a été envoyé aux 34 établissements situés en France entrant dans le cadre de cette étude. À partir des réponses apportées par les exploitants, l'IRSN a réalisé en 2015 un état des lieux en France des rejets radioactifs gazeux émis par ces installations. L'objectif de cet article est de présenter une partie des résultats et statistiques obtenus, regroupés en trois thèmes principaux : les caractéristiques de production des radionucléides, les moyens de limitation des rejets mis en place et les moyens de mesure et de suivi des effluents gazeux radioactifs rejetés.

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Analysis of induced radionuclides in replacement parts and liquid wastes in a medical cyclotron solely used for production of 18F for [18F]FDG

Cited by 7 publications

References 14 publications

Synthesis, quality control and determination of metallic impurities in 18F-fludeoxyglucose production process

Synthesis, quality control and determination of metallic impurities in 18F-fludeoxyglucose production process

Pre‐discard estimation of radioactivated materials in positron emission tomography cyclotron systems and concrete walls of a cyclotron vault

État des lieux en France des rejets radioactifs gazeux émis par les installations détenant un cyclotron

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