The bioaccumulation factor for phosphorus-32 in edible fish tissue

Area of Science:

• Environmental Science
• Radiological Science
• Aquatic Ecology

Background:

• Current bioaccumulation factor values for 32P in fish are used for radiation dose calculations from nuclear reactor effluents.
• These values may not accurately reflect 32P dynamics in aquatic ecosystems.

Purpose of the Study:

• To review and evaluate the bioaccumulation factor for 32P in edible fish portions.
• To assess the adequacy of existing recommended values for radiation dose calculations.

Main Methods:

• Reviewed existing information on 32P bioaccumulation in fish.
• Calculated a generic phosphorus bioaccumulation factor based on environmental concentrations.
• Inferred a 32P bioaccumulation factor considering radioactive decay rates and phosphorus turnover in fish muscle.

Main Results:

• A generic phosphorus bioaccumulation factor of 70,000 was derived for rivers and estuarine waters.
• The bioaccumulation factor for 32P is estimated to be 20-fold lower than for stable phosphorus.
• Phosphorus turnover rate in fish muscle was estimated at 0.2% per day.

Conclusions:

• Existing recommended bioaccumulation factors for 32P may require revision.
• Radioactive decay significantly impacts 32P bioaccumulation compared to stable phosphorus.
• Site-specific assessments are necessary due to variations in phosphorus concentration, turnover rates, and food web dynamics.