Accuracy of Dose Calibrator

Dose Calibrator Accuracy Test

Reference Source Details

Radioisotope:

Half-life:

Certified Activity:

Certification Date & Time:

Dose Calibrator Measurement

Measured Activity:

Measurement Date & Time:

Acceptance Limit (%):

Decay-Corrected Activity

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Measured Activity

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Absolute Error

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Percentage Error

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Status: —

How It Works

This tool verifies the accuracy of a dose calibrator by comparing its reading against the decay-corrected certified activity of a reference source.

Select the Radioisotope: Choose the reference source isotope (Co-57, Cs-137, Ba-133 are common long-lived check sources) or select "Custom" to enter any half-life.
Certified Activity and Certification Date: Enter the activity stated on the reference source certificate and the date/time it was certified.
Measured Activity and Measurement Date: Enter the reading from the dose calibrator and the exact date/time of measurement.
Acceptance Limit: Enter your departmental or regulatory acceptance limit (commonly 5% or 10%). The result is flagged Pass, Caution, or Fail accordingly.
Calculation:
- Decay constant: λ = ln(2) / t_1/2
- Elapsed time: Δt = Measurement time − Certification time
- Expected activity: A_exp = A_cert × e^−λΔt
- Absolute error: |A_meas − A_exp|
- Percentage error: ((A_meas − A_exp) / A_exp) × 100
Status: Pass if |% error| is within the acceptance limit. Caution if within 1.5× the limit. Fail if beyond 1.5× the limit.
Saved Records: Save each QC measurement for audit trail and trend monitoring. Load any record to review the inputs.

This tool is for educational and quality control reference purposes only.