Activity determination of ⁵⁶Mn using extended TDCR-Čerenkov method.

Area of Science:

• Nuclear physics
• Metrology

Background:

• Accurate activity determination of activated nuclide 56Mn is vital for radionuclide neutron source characterization using the manganese bath method.
• The TDCR-Čerenkov method offers a potential alternative to the 4π(Č)-γ method for 56Mn activity measurement.

Purpose of the Study:

• To extend the existing TDCR-Čerenkov calculation model for precise 56Mn activity determination.
• To overcome challenges in efficiency computation and interference from Čerenkov photons.

Main Methods:

• Incorporated the decay scheme of 56Mn into efficiency calculations.
• Calculated gamma transition efficiency using simulated secondary electron spectra.
• Corrected for Čerenkov photons in photomultiplier windows via light-proofing experiments and an improved model.

Main Results:

• Successfully extended the TDCR-Čerenkov method's calculation model.
• Addressed key difficulties in efficiency computation and Čerenkov photon interference.
• Achieved results consistent with other standardization techniques.

Conclusions:

• The extended TDCR-Čerenkov method provides accurate activity determination for 56Mn.
• This advancement supports the manganese bath method for radionuclide neutron source characterization.