Journal Article 低レベル放射能の68Geを用いた 68Ge/68Gaジェネレータの作製と放射化学実習への応用
Manufacture and Utilization of a Low-level Radioactive 68Ge/68Ga Generator in a Radiochemistry Laboratory Course

鷲山, 幸信  ,  天野, 良平  ,  野崎, 正  ,  小川, 幸次  ,  永津, 弘太郎  ,  阪間, 稔  ,  井戸, 達雄  ,  山口, 博司

71 ( 10 )  , pp.983 - 993 , 2015-10-01 , 日本放射線技術学会 = Japanese society of radiological technology
The low-level radioactivity of a 68Ge/68Ga generator is a suitable tool for measuring radioactive growth and decay after 68Ga milking due to their desirable nuclear decay properties, such as the EC decay of 68Ge with no γ-ray emission andthe β+ decay of 68Ga with a weak γ-ray emission. To experience andund erstandrad ioactive equilibrium during a university laboratory course, we surveyedandtestedthe production of a small amount of 68Ge and set up educational programs to manufacture a 68Ge/68Ga generator for measuring the growth andd ecay of 68Ga. The irradiation of natGa with 25 μA of a 30 MeV proton beam from a cyclotron for 4 h yields ca. 111 MBq of 68Ge, which was sufficient to supply to several universities. For use as the adsorbent of the generator column, particles of hydrated tin (VI) oxide were prepared from precipitated tin hydroxide gel. Repeated elution of 68Ga from the handmade 68Ge/68Ga generator gave constant amounts of 68Ga with acceptable breakthrough of 68Ge. The feedback from the student’s experience with the 68Ge/68Ga generator was evaluatedby annual questionnaire surveys, which were given to all students taking the course every year from 2012 to 2014. It has been made clear that more than half of the students were interested in the 68Ge/68Ga generator program, andthis interest increasedfrom 54.9%in 2012 to 78.6%in 2014. A low-level radioactive 68Ge/68Ga generator is thus expectedto be a suitable experimental tool for demonstrating the phenomenon of radioactivity to students in an intriguing way.

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