Characterization of the neutron flux on the surface of a liquid
water target intended for 18F production

J 2021

Characterization of the neutron flux on the surface of a liquid water target intended for 18F production

KOŠŤÁL, Michal; Martin SCHULC; Losa EVŽEN; Zdeněk MATĚJ; František CVACHOVEC et. al.

Základní údaje

Originální název

Characterization of the neutron flux on the surface of a liquid water target intended for 18F production

Autoři

Vydání

Radiation Physics and Chemistry, Elsevier, 2021, 0969-806X

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10304 Nuclear physics

Stát vydavatele

Velká Británie a Severní Irsko

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 2.776

Kód RIV

RIV/00216224:14330/21:00120061

Organizační jednotka

Fakulta informatiky

DOI

https://doi.org/10.1016/j.radphyschem.2021.109475

UT WoS

000655297900005

EID Scopus

2-s2.0-85104089006

Klíčová slova anglicky

PET;IBA;XXL target;Neutron spectrometry;Cyclotron;Radiation protection

Změněno: 28. 4. 2022 10:08, RNDr. Pavel Šmerk, Ph.D.

Anotace

V originále

8F is an important radioisotope used in nuclear medicine for diagnostic purposes. It is produced most often via 18O (p,n)18F reaction. During its production, the oxygen contained in the H218O molecules placed in the cooled target is irradiated by accelerated protons. The production of each 18F atom is accompanied by anisotropic highenergy neutron emission, which is a problem for ensuring radiation safety. These neutrons are responsible for the high radiation dose in a cyclotron pit during 18F production as well as for activation of cyclotron components or might be responsible even for target material changes due to their high penetration properties. A precise characterization of a neutron field on the surface of the liquid water target, used for 18F production, is presented. The neutron flux characterization is performed both by using large-area activation detectors and stilbene detectors at 1 m from the target in a forward direction. The experiments show significant discrepancies between calculated and measured reaction rates in higher threshold reactions 58Ni(n,x)57Co and 51V (n,alpha)48Sc, confirming that the current neutron production reaction models are not suitable for the characterization of the secondary neutrons leaking from the target.

Návaznosti

VI20192022116, projekt VaV

Název: Metody přenosu a detekce scintilačního záření s optickými vlákny a energetickým rozlišením zdrojů ionizujícího záření (Akronym: SIREM)

Investor: Ministerstvo vnitra ČR, Metody přenosu a detekce scintilačního záření s optickými vlákny a energetickým rozlišením zdrojů ionizujícího záření

Citovat

KOŠŤÁL, Michal; Martin SCHULC; Losa EVŽEN; Zdeněk MATĚJ; František CVACHOVEC; Filip MRAVEC; Filip BRIJAR; Tomáš CZAKOJ; Jan ŠIMON; Šimon VADJÁK; Michal ANTOŠ; Václav PŘENOSIL; Vojtěch RYPAR; Marek ZMEŠKAL a Roberto CAPOTE. Characterization of the neutron flux on the surface of a liquid water target intended for 18F production. Radiation Physics and Chemistry. Elsevier, 2021, roč. 184, č. 109475, s. 1-13. ISSN 0969-806X. Dostupné z: https://doi.org/10.1016/j.radphyschem.2021.109475.

@article{1804589,
   author = {Košťál, Michal and Schulc, Martin and Evžen, Losa and Matěj, Zdeněk and Cvachovec, František and Mravec, Filip and Brijar, Filip and Czakoj, Tomáš and Šimon, Jan and Vadják, Šimon and Antoš, Michal and Přenosil, Václav and Rypar, Vojtěch and Zmeškal, Marek and Capote, Roberto},
   article_number = {109475},
   doi = {https://doi.org/10.1016/j.radphyschem.2021.109475},
   keywords = {PET;IBA;XXL target;Neutron spectrometry;Cyclotron;Radiation protection},
   language = {eng},
   issn = {0969-806X},
   journal = {Radiation Physics and Chemistry},
   title = {Characterization of the neutron flux on the surface of a liquid water target intended for 18F production},
   url = {https://www.sciencedirect.com/science/article/pii/S0969806X21001250},
   volume = {184},
   year = {2021}
}

TY  - JOUR
ID  - 1804589
AU  - Košťál, Michal - Schulc, Martin - Evžen, Losa - Matěj, Zdeněk - Cvachovec, František - Mravec, Filip - Brijar, Filip - Czakoj, Tomáš - Šimon, Jan - Vadják, Šimon - Antoš, Michal - Přenosil, Václav - Rypar, Vojtěch - Zmeškal, Marek - Capote, Roberto
PY  - 2021
TI  - Characterization of the neutron flux on the surface of a liquid water target intended for 18F production
JF  - Radiation Physics and Chemistry
VL  - 184
IS  - 109475
SP  - 1-13
EP  - 1-13
PB  - Elsevier
SN  - 0969806X
KW  - PET;IBA;XXL target;Neutron spectrometry;Cyclotron;Radiation protection
UR  - https://www.sciencedirect.com/science/article/pii/S0969806X21001250
N2  - 8F is an important radioisotope used in nuclear medicine for diagnostic purposes. It is produced most often via 18O (p,n)18F reaction. During its production, the oxygen contained in the H218O molecules placed in the cooled target is irradiated by accelerated protons. The production of each 18F atom is accompanied by anisotropic highenergy neutron emission, which is a problem for ensuring radiation safety. These neutrons are responsible for the high radiation dose in a cyclotron pit during 18F production as well as for activation of cyclotron components or might be responsible even for target material changes due to their high penetration properties. A precise characterization of a neutron field on the surface of the liquid water target, used for 18F production, is presented. The neutron flux characterization is performed both by using large-area activation detectors and stilbene detectors at 1 m from the target in a forward direction. The experiments show significant discrepancies between calculated and measured reaction rates in higher threshold reactions 58Ni(n,x)57Co and 51V (n,alpha)48Sc, confirming that the current neutron production reaction models are not suitable for the characterization of the secondary neutrons leaking from the target.
ER  -

KOŠŤÁL, Michal; Martin SCHULC; Losa EVŽEN; Zdeněk MATĚJ; František CVACHOVEC; Filip MRAVEC; Filip BRIJAR; Tomáš CZAKOJ; Jan ŠIMON; Šimon VADJÁK; Michal ANTOŠ; Václav PŘENOSIL; Vojtěch RYPAR; Marek ZMEŠKAL a Roberto CAPOTE. Characterization of the neutron flux on the surface of a liquid water target intended for 18F production. \textit{Radiation Physics and Chemistry}. Elsevier, 2021, roč.~184, č.~109475, s.~1-13. ISSN~0969-806X. Dostupné z: https://doi.org/10.1016/j.radphyschem.2021.109475.

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