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Bateman Radioactive Decay Series & Daughter Ingrowth Calculator

The Bateman equations describe the time-dependent inventory and activity ingrowth of radionuclides in radioactive decay parent-daughter chains.

Calculated Result
694.8 Bq

Daughter Activity A2(t)

Parent Activity A1(t)

881.6 Bq

Decay Equilibrium Class

Transient Equilibrium

Parent Decay Constant (λ1)

0.0105 hr⁻¹

Daughter Decay Constant (λ2)

0.1155 hr⁻¹

Calculation Breakdown

  1. Compute parent and daughter radioactive decay constantsλ1 = ln(2)/66 = 0.0105 hr⁻¹; λ2 = ln(2)/6 = 0.1155 hr⁻¹
  2. Apply Bateman two-species decay equation for daughter activityA2(t) = A1(0) · [λ2 / (λ2 - λ1)] · [e^(-λ1·t) - e^(-λ2·t)] = 694.8 Bq

Daughter Activity Over Time (Bq)

Interactive visualization based on your current inputs

A2(t)
0.02234456688900 h6 h12 h24 h48 hElapsed Time (h)Daughter Activity (Bq)

What Is the Bateman Radioactive Decay Series & Daughter Ingrowth Calculator?

The Bateman equations describe the time-dependent inventory and activity ingrowth of radionuclides in radioactive decay parent-daughter chains.

How Does the Bateman Radioactive Decay Series & Daughter Ingrowth Calculator Work?

The calculation evaluates user-provided measurements using recognized domain equations, converts between measurement units, and adjusts for real-world efficiency factors.

Bateman Radioactive Decay Series & Daughter Ingrowth Calculator Formula & Variables

The core mathematical equation utilized by this calculator is expressed as:

A_2(t) = A_1(0) \frac{\lambda_2}{\lambda_2 - \lambda_1} \left(e^{-\lambda_1 t} - e^{-\lambda_2 t}\right)

Daughter activity rises from zero to a transient peak before decaying alongside the longer-lived parent isotope.

How to Use the Bateman Radioactive Decay Series & Daughter Ingrowth Calculator

  1. Enter your primary measurements in the input fields above.
  2. Select your preferred units (e.g. metric or imperial) if applicable.
  3. Review or adjust operational assumptions such as field efficiency.
  4. Click Calculate to instantly generate the full results breakdown and visual chart.
  5. Use the Reset button at any time to clear the form and test a new scenario.

Step-by-Step Example Calculation

Mo-99 to Tc-99m Generator (66h to 6h)

Input Values:

parentInitialActivityBq:1000
parentHalfLifeHours:66
daughterHalfLifeHours:6
elapsedTimeHours:12

Understanding Your Result

Your calculated result represents the realistic operational capacity or baseline output under the specified conditions. Comparing theoretical and effective outputs reveals the direct impact of turns, overlap, and practical downtime.

Factors That Affect the Result

Field terrain, operator experience, equipment maintenance, overlap margin, and weather conditions can significantly influence real-world output.

When Should You Use This Calculator?

Use this calculator whenever you need quick, verified estimates for job planning, budgeting, equipment sizing, or project timelines.

Assumptions & Limitations

  • Assumes zero initial daughter quantity at time t = 0.

Frequently Asked Questions

Calculation Accuracy & Reference Note

This calculator implements verified, deterministic mathematical equations based on published standards. Results should be treated as professional engineering estimates; always verify critical operations with local equipment manuals and site inspections.

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