Matches in SemOpenAlex for { <https://semopenalex.org/work/W59172502> ?p ?o ?g. }
Showing items 1 to 100 of
100
with 100 items per page.
- W59172502 endingPage "1429" @default.
- W59172502 startingPage "1429" @default.
- W59172502 abstract "1429 Objectives The increased demand of PET-radiopharmaceuticals has been satisfied mainly due to the upgrading of existing cyclotrons to enable higher beam currents for the production of 18F. In these cases it is also necessary to determine if the cyclotron shielding is adequate to maintain the radiation levels below safety limits. The objective of this work was to measure the neutron and gamma dose equivalent rates of a self-shielded PET cyclotron after upgrading the beam current from 40 to 60 µA. Methods The device employed was a RDS 111 cyclotron. Thermoluminiscent dosemeters (TLD) LiF:Mg,Ti chips (TLD-600, 3×3×1 mm) and LiF:Mg,Cu,P rods (GR-207, 1 mm diameter, 6 mm length) were used to evaluate the neutron and gamma radiation fields, respectively. The response of the TLD-600 was calibrated for thermal neutron flux in a bonner-sphere using a 241Am-Be source while the GR-207 gamma-response was calibrated with a 60Co source. Dosemeters were irradiated at various locations around the shielding during 18F production via the 18O(p,n) reaction. Results With the cyclotron operating at 40 µA, the average gamma and neutron dose equivalent rates, at the different locations of measurement, varied from 4.9±1.5 to 14.0±2.0 µSv/h and 1.4±0.7 to 2.4±1.1 µSv/h, respectively. After the upgrade of the cyclotron, with capability to irradiate at 60 µA, these values varied from 6.5±3.8 to 14.0±3.0 and 2.9±1.2 to 3.7±0.9 µSv/h, respectively. According to specifications of the manufacturer the original shielding of the cyclotron was designed to maintain the total radiation levels below 20 µSv/h (16 µSv/h for gammas and 4 µSv/h for neutrons) on a box-shaped surface analogous to a real room boundary. Conclusions The results of this work indicate that the shielding of the cyclotron after the upgrade with increased current capability is still adequate to maintain the radiation levels below 20 µSv/h. Research Support Research partially founded by CONACYT Grant 121652" @default.
- W59172502 created "2016-06-24" @default.
- W59172502 creator A5006344244 @default.
- W59172502 creator A5063662101 @default.
- W59172502 creator A5065958554 @default.
- W59172502 creator A5087207079 @default.
- W59172502 date "2011-05-01" @default.
- W59172502 modified "2023-10-17" @default.
- W59172502 title "Neutron and gamma dose equivalent rates in the vicinity of a self-shielded PET cyclotron after an upgrade with increased beam current" @default.
- W59172502 hasPublicationYear "2011" @default.
- W59172502 type Work @default.
- W59172502 sameAs 59172502 @default.
- W59172502 citedByCount "0" @default.
- W59172502 crossrefType "journal-article" @default.
- W59172502 hasAuthorship W59172502A5006344244 @default.
- W59172502 hasAuthorship W59172502A5063662101 @default.
- W59172502 hasAuthorship W59172502A5065958554 @default.
- W59172502 hasAuthorship W59172502A5087207079 @default.
- W59172502 hasConcept C105636585 @default.
- W59172502 hasConcept C111337013 @default.
- W59172502 hasConcept C119599485 @default.
- W59172502 hasConcept C120665830 @default.
- W59172502 hasConcept C121332964 @default.
- W59172502 hasConcept C127413603 @default.
- W59172502 hasConcept C147120987 @default.
- W59172502 hasConcept C148325268 @default.
- W59172502 hasConcept C152568617 @default.
- W59172502 hasConcept C153385146 @default.
- W59172502 hasConcept C168834538 @default.
- W59172502 hasConcept C177322064 @default.
- W59172502 hasConcept C181833780 @default.
- W59172502 hasConcept C185544564 @default.
- W59172502 hasConcept C185592680 @default.
- W59172502 hasConcept C192562407 @default.
- W59172502 hasConcept C2265751 @default.
- W59172502 hasConcept C27251351 @default.
- W59172502 hasConcept C2777620619 @default.
- W59172502 hasConcept C2989005 @default.
- W59172502 hasConcept C30134620 @default.
- W59172502 hasConcept C39527238 @default.
- W59172502 hasConcept C62520636 @default.
- W59172502 hasConcept C71924100 @default.
- W59172502 hasConcept C77590175 @default.
- W59172502 hasConcept C7910260 @default.
- W59172502 hasConceptScore W59172502C105636585 @default.
- W59172502 hasConceptScore W59172502C111337013 @default.
- W59172502 hasConceptScore W59172502C119599485 @default.
- W59172502 hasConceptScore W59172502C120665830 @default.
- W59172502 hasConceptScore W59172502C121332964 @default.
- W59172502 hasConceptScore W59172502C127413603 @default.
- W59172502 hasConceptScore W59172502C147120987 @default.
- W59172502 hasConceptScore W59172502C148325268 @default.
- W59172502 hasConceptScore W59172502C152568617 @default.
- W59172502 hasConceptScore W59172502C153385146 @default.
- W59172502 hasConceptScore W59172502C168834538 @default.
- W59172502 hasConceptScore W59172502C177322064 @default.
- W59172502 hasConceptScore W59172502C181833780 @default.
- W59172502 hasConceptScore W59172502C185544564 @default.
- W59172502 hasConceptScore W59172502C185592680 @default.
- W59172502 hasConceptScore W59172502C192562407 @default.
- W59172502 hasConceptScore W59172502C2265751 @default.
- W59172502 hasConceptScore W59172502C27251351 @default.
- W59172502 hasConceptScore W59172502C2777620619 @default.
- W59172502 hasConceptScore W59172502C2989005 @default.
- W59172502 hasConceptScore W59172502C30134620 @default.
- W59172502 hasConceptScore W59172502C39527238 @default.
- W59172502 hasConceptScore W59172502C62520636 @default.
- W59172502 hasConceptScore W59172502C71924100 @default.
- W59172502 hasConceptScore W59172502C77590175 @default.
- W59172502 hasConceptScore W59172502C7910260 @default.
- W59172502 hasLocation W591725021 @default.
- W59172502 hasOpenAccess W59172502 @default.
- W59172502 hasPrimaryLocation W591725021 @default.
- W59172502 hasRelatedWork W1983464381 @default.
- W59172502 hasRelatedWork W1999365638 @default.
- W59172502 hasRelatedWork W2047203247 @default.
- W59172502 hasRelatedWork W2078892675 @default.
- W59172502 hasRelatedWork W2093401418 @default.
- W59172502 hasRelatedWork W2096595360 @default.
- W59172502 hasRelatedWork W2185977063 @default.
- W59172502 hasRelatedWork W2186191281 @default.
- W59172502 hasRelatedWork W2207927379 @default.
- W59172502 hasRelatedWork W2338726685 @default.
- W59172502 hasRelatedWork W2737173558 @default.
- W59172502 hasRelatedWork W2806345751 @default.
- W59172502 hasRelatedWork W2998896237 @default.
- W59172502 hasRelatedWork W2998919959 @default.
- W59172502 hasRelatedWork W3011984832 @default.
- W59172502 hasRelatedWork W3049678880 @default.
- W59172502 hasRelatedWork W3096823273 @default.
- W59172502 hasRelatedWork W846602839 @default.
- W59172502 hasRelatedWork W2182391777 @default.
- W59172502 hasRelatedWork W2552886967 @default.
- W59172502 hasVolume "52" @default.
- W59172502 isParatext "false" @default.
- W59172502 isRetracted "false" @default.
- W59172502 magId "59172502" @default.
- W59172502 workType "article" @default.