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Calcimator

Radiation Exposure Tracking Calculator

Track cumulative radiation dose against annual occupational limits and ALARA targets.

Inputs

mSv
mSv
mSv
mSv
mSv

Results

Cumulative Dose This Year

6.7 mSv

Annual Limit Used

33.5%

Remaining Allowable Dose13.3 mSv
ALARA Target Used67%
Projected Annual Dose13.4 mSv
Allowable Monthly Rate (remaining)2.22 mSv/month
Administrative Action Level1
Exceeds ALARA Target0
Exceeds Regulatory Limit0
Five Year Ok1
How to Use This Calculator
  1. Enter Prior Annual Dose, Current Quarter Dose, and Typical Monthly Dose.
  2. Set Months Elapsed This Year, Annual Occupational Limit, and ALARA Administrative Target.
  3. Review Cumulative Dose This Year (mSv) and Annual Limit Used (%).
  4. Use Remaining Allowable Dose (mSv) and ALARA Target Used (%) to inform your decision.
  5. Use the chart to visualize the results and explore different scenarios by adjusting inputs.

How the result changes with Typical Monthly Dose

Typical Monthly DoseCumulative Dose This YearAnnual Limit Used
215.7 mSv78.5%
745.7 mSv228.5%
1381.7 mSv408.5%
18111.7 mSv558.5%

What each input means

Prior Annual Dose
Accumulated dose from earlier in the year (before current quarter) in mSv.
Current Quarter Dose
Dose accumulated during the current quarter in mSv.
Typical Monthly Dose
Typical monthly dose rate for projection purposes in mSv.
Months Elapsed This Year
Number of months elapsed in the current monitoring year.
Annual Occupational Limit
Annual occupational dose limit in mSv. NRC limit: 50 mSv, ICRP recommendation: 20 mSv.
ALARA Administrative Target
Site-specific ALARA administrative dose target, typically well below the regulatory limit.

What each result means

Administrative Action Level
0=Normal, 1=Level 1 (25%), 2=Level 2 (50%), 3=Level 3 (75%)
Exceeds ALARA Target
1 = Yes, 0 = No

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Prior Annual Dose = 2.5, Current Quarter Dose = 1.2, Typical Monthly Dose = 0.5, Months Elapsed This Year = 6 = 6 input(s) provided
  2. Calculate Cumulative Dose This Year
    6.7 = 6.7
  3. Calculate Annual Limit Used
    Annual Limit Used
    33.5 = 33.5%
  4. Calculate Remaining Allowable Dose
    Remaining Allowable Dose
    13.3 = 13.3
  5. Calculate ALARA Target Used
    ALARA Target Used
    67 = 67%

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