研究目的
To develop a method for fabricating optical filters using printed plastic film for the standardization of 147Pm via TDCR liquid scintillation counting.
研究成果
The developed printing technique for optical filters successfully enabled the standardization of 147Pm, with a measured specific activity of 42.10±0.40 kBq/g. The method is effective for varying TDCR values and is suitable for calibration services, with potential for extension to other nuclides.
研究不足
The method relies on specific materials and equipment (e.g., laser printer, plastic films), which may not be universally available. The optical filters are handmade, potentially introducing variability; automation could improve consistency. Applicability to other nuclides may require further validation.
1：Experimental Design and Method Selection:
The study uses the TDCR method with optical filters to vary counting efficiency. Optical filters are fabricated by printing toner on plastic film with graduated color steps to absorb scintillation light.
2：Sample Selection and Data Sources:
A 147PmCl3 aqueous solution is used as the radioactive source, mixed with Ultima Gold liquid scintillator in vials.
3：List of Experimental Equipment and Materials:
Includes printable plastic film (Kokuyo LBP-OD101T-10), Saran wrap (Asahi Kasei Corporation), printer (Epson LP-S9000), computer (Hewlett-Packard Z400), cutter (Kokuyo HA-F57), LibreOffice software, and a custom-made TDCR counter.
4：Experimental Procedures and Operational Workflow:
Fabricate optical filters by printing toner, cutting segments, adhering Saran wrap, and forming cylindrical filters. Perform TDCR measurements with the filters to vary efficiency, using dead time of 20 μs, high voltage of 1900 V, resolution time of 50 ns, and measurement time of 500 s repeated three times.
5：Data Analysis Methods:
Data is analyzed using a custom-made program for efficiency fitting with polynomial approximation and the Newton-Raphson method.
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liquid scintillator
Ultima Gold
Perkin Elmer
Used in the vials with the radioactive solution for scintillation counting in the TDCR measurements.
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plastic film
LBP-OD101T-10
Kokuyo
Used as a base material for printing toner to create optical filters that absorb scintillation light in TDCR measurements.
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plastic film
Asahi Kasei Corporation
Used as Saran wrap to adhere to the printed segments for forming cylindrical optical filters.
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printer
LP-S9000
Epson
Used to print toner on the plastic film for creating graduated color steps in the optical filters.
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computer
Z400
Hewlett-Packard
Used with LibreOffice software to design the optical filters and possibly for data analysis.
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cutter
HA-F57
Kokuyo
Used to cut the printed plastic sheet into segments for optical filter fabrication.
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software
LibreOffice
Used to design the optical filters with graduated toner color steps.
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TDCR counter
custom-made
Used to perform the triple to double coincidence measurements for radioactivity standardization.
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