Related Experiment Video
Updated: Jun 24, 2026

Speciation and Bioavailability Measurements of Environmental Plutonium Using Diffusion in Thin Films
Published on: November 9, 2015
Calculation of isotope-specific exemption levels for surface contamination
Haruyuki Ogino1, Takatoshi Hattori
1Central Research Institute of Electric Power Industry (CRIEPI), Radiation Safety Research Center, 2-11-1 Iwadokita, Komae, Tokyo, Japan. haruyuki@criepi.denken.or.jp
New isotope-specific exemption levels for surface contamination in nuclear power plants were calculated using a deterministic dose assessment model. These levels are higher for certain radionuclides than conventional methods, improving radiation safety assessments.
Area of Science:
- Nuclear Safety
- Radiation Protection
- Environmental Science
Background:
- Surface contamination in nuclear power plants requires accurate exemption levels for safe management.
- Current methods may not fully account for radionuclide-specific properties and contamination distribution.
Purpose of the Study:
- To develop isotope-specific exemption levels for surface contamination in nuclear power plants.
- To propose a practical method for assessing gross surface contamination using gamma-ray emission.
- To enhance radiation, transport, and waste safety by refining dose assessment models.
Main Methods:
- Developed a deterministic dose assessment model for surface contamination, classifying objects into manually, closely, and remotely handled types.
- Applied exemption criteria of 0.01 mSv/yr (realistic exposure) and 1 mSv/yr (low-probability exposure) based on IAEA standards.
- Considered variable distribution areas of surface contamination instead of a fixed 100 cm(2) area.
Main Results:
- Calculated isotope-specific exemption levels for representative radionuclides (e.g., Mn-54, Co-60, Cs-137).
- Proposed a method for judging gross surface contamination exemption via gross gamma-ray emission measurement.
- Found higher exemption levels for specific radionuclides compared to conventional methods due to a refined dose assessment model.
Conclusions:
- The developed model provides more accurate isotope-specific exemption levels for surface contamination.
- The proposed method offers a practical approach to managing surface contamination in nuclear facilities.
- Refined exemption levels contribute to improved radiation safety and waste management practices.
More Related Videos
14:53In Situ Detection and Single Cell Quantification of Metal Oxide Nanoparticles Using Nuclear Microprobe Analysis
Published on: February 3, 2018
14:11Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis
Published on: March 29, 2016
Related Concept Videos
Biological Effects of Radiation
Atomic Absorption Spectroscopy: Lab
Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing nebulizer...
Mass Spectrometry: Isotope Effect
Atomic Emission Spectroscopy: Overview