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Calcimator

Decontamination Factor Calculator

Calculate decontamination factor and efficiency from before and after contamination measurements.

Inputs

Bq/cm²
Bq/cm²
sq ft

Results

Decontamination Factor

100×

Decontamination Efficiency

99%

Activity Removed49,500 Bq/cm²
Removal per Unit Area4,950 Bq/cm² per m²
DF per Pass4.64×
Fraction Remaining0.01
Additional Passes for DF=1000
Meets Release Criteria1
Estimated Waste Volume3 L
How to Use This Calculator
  1. Enter Initial Contamination, Final Contamination, and Contaminated Area.
  2. Set Number of Decon Passes.
  3. Review Decontamination Factor (×) and Decontamination Efficiency (%).
  4. Use Activity Removed (Bq/cm²) and Removal per Unit Area (Bq/cm² per m²) to inform your decision.
  5. Use the chart to visualize the results and explore different scenarios by adjusting inputs.

How the result changes with Final Contamination

Final ContaminationDecontamination FactorDecontamination Efficiency
1,000,000,0000×-1,999,900%
3,500,000,0000×-6,999,900%
6,500,000,0000×-12,999,900%
9,000,000,0000×-17,999,900%

What each input means

Initial Contamination
Surface contamination level before decontamination in Bq per cm².
Final Contamination
Surface contamination level after decontamination in Bq per cm².
Contaminated Area
Total contaminated surface area in square meters.
Number of Decon Passes
Number of decontamination passes or cycles performed.

What each result means

Meets Release Criteria
1 = Yes (<1000 Bq/cm²), 0 = No

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Initial Contamination = 50000, Final Contamination = 500, Contaminated Area = 10, Number of Decon Passes = 3 = 4 input(s) provided
  2. Calculate Decontamination Factor
    Decontamination Factor
    100 = 100
  3. Calculate Decontamination Efficiency
    Decontamination Efficiency
    99 = 99%
  4. Calculate Activity Removed
    Activity Removed
    49500 = 49500
  5. Calculate Removal per Unit Area
    Removal per Unit Area
    4950 = 4950

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