Radiopharmaceutical Dispensing Planner

Saved Sessions

Vial / Stock Details

Radioisotope: Tc-99m (t½ = 6 h) F-18 (t½ = 1.83 h) Ga-68 (t½ = 1.13 h) I-123 (t½ = 13.2 h) I-124 (t½ = 100.2 h) I-131 (t½ = 192.6 h) In-111 (t½ = 67.3 h) Tl-201 (t½ = 73.1 h) Ga-67 (t½ = 78.3 h) Lu-177 (t½ = 160.8 h) Y-90 (t½ = 64.1 h) Sm-153 (t½ = 46.3 h) Ra-223 (t½ = 274.8 h) Ac-225 (t½ = 240 h) Cu-64 (t½ = 12.7 h) Zr-89 (t½ = 78.4 h) Rb-82 (t½ = 0.01867 h) N-13 (t½ = 0.167 h) O-15 (t½ = 0.03353 h) C-11 (t½ = 0.34 h) Custom

Half-life: sec min hours days years

Activity: Bq kBq MBq GBq µCi mCi Ci TBq

Volume (ml):

Calibration Date & Time:

---

Dispensing Details

Required Activity: Bq kBq MBq GBq µCi mCi Ci TBq

Dispensing Date & Time:

Required Volume: ml

How It Works

This calculator helps determine the required volume of a radiopharmaceutical based on its activity and the time elapsed since calibration, accounting for radioactive decay.

1. Select the Radioisotope: Choose from common nuclear medicine isotopes or select "Custom" to enter any half-life manually.
2. Input Activity and Volume: Enter the activity and volume (ml) from the vial label at calibration time. Select your preferred activity unit inline.
3. Calibration Date and Time: The reference time printed on the vial. Use "Now" to set the current time instantly.
4. Required Activity: Enter the dose to dispense. You can use a different unit from the stock activity if needed.
5. Dispensing Date and Time: The time at which the dose needs to be ready. Use "Now" for immediate dispensing.
6. Calculation:
   • Decay constant: λ = ln(2) / t_1/2
   • Elapsed time: Δt = Dispensing time − Calibration time
   • Initial concentration: C₀ = A₀ / V
   • Decay-corrected concentration: C = C₀ × e^−λΔt
   • Required volume: V_req = A_req / C
7. Saved Sessions: Save vial details for quick reuse. Load any session to restore all vial inputs instantly.

This tool is for educational purposes only.

Made by Poovendhan.

Save Session