The Livermore phantom history and supplementation.

Area of Science:

• Nuclear physics and radiation detection.
• Medical physics and health physics.
• Biomonitoring and occupational health.

Background:

• In vivo monitoring facilities are essential for detecting internally deposited radionuclides.
• Accurate quantification requires sensitive detection systems capable of identifying specific nuclides at relevant levels.
• Phantoms are critical tools for calibrating and improving the accuracy of in vivo measurements.

Observation:

• The Lawrence Livermore National Laboratory (LLNL) torso phantom, developed in the 1970s, remains a widely used tool, particularly for low-energy photon detection from transuranic elements.
• This phantom has been instrumental in lung monitoring facilities for assessing internal contamination.
• The historical development, design evolution, and current availability of the LLNL phantom are documented.

Findings:

• The authors have enhanced the utility of the LLNL phantom by performing surface scans.
• Surface scan files of the LLNL phantom are now accessible via the internet.
• This advancement facilitates more precise phantom utilization and data acquisition.

Implications:

• Increased accessibility of phantom scan data can improve the accuracy and standardization of in vivo monitoring.
• Enhanced phantom data supports better calibration of detection systems for transuranic nuclides.
• This resource aids in occupational health and safety by improving the assessment of internal radionuclide exposure.