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Calcimator

Isotope Production Calculator

Calculate activity produced from neutron irradiation given flux, cross section, and irradiation time.

Inputs

oz
barns
n/cm²/s
hours
hours

Results

Produced Activity

33.42 GBq

Produced Activity903.17 mCi
Produced Activity33,417,143,459 Bq
Fraction of Saturation0
Saturation Activity22,281,400,000,000 Bq
Optimal Irradiation Time161,637 hours
Specific Activity33,417,143,459 Bq/g
Product Atoms Produced8,015,287,409,500,533,000
Decay Constant0
How to Use This Calculator
  1. Enter Target Mass, Activation Cross Section, and Neutron Flux.
  2. Set Irradiation Time and Product Half-Life.
  3. Review the Produced Activity (GBq) result.
  4. Use Produced Activity (mCi) and Produced Activity (Bq) to inform your decision.
  5. Use the chart to visualize the results and explore different scenarios by adjusting inputs.

How the result changes with Product Half-Life

Product Half-LifeProduced Activity
10,000,0000.15 GBq
35,000,0000.04 GBq
65,000,0000.02 GBq
90,000,0000.02 GBq

What each input means

Target Mass
Mass of the target material to be irradiated in grams.
Activation Cross Section
Thermal neutron activation cross section in barns. Co-59→Co-60: 37 b, Mo-98→Mo-99: 0.13 b.
Neutron Flux
Thermal neutron flux at the irradiation position. Research reactors: 10¹³–10¹⁵ n/cm²/s.
Irradiation Time
Duration of neutron irradiation in hours.
Product Half-Life
Half-life of the produced radioactive isotope in hours. Co-60: 46,182 hr, Mo-99: 65.9 hr.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Target Mass = 1, Activation Cross Section = 37, Neutron Flux = 100000000000000, Irradiation Time = 100 = 5 input(s) provided
  2. Calculate Produced Activity
    Produced Activity
    33.417 = 33.417
  3. Calculate Produced Activity
    Produced Activity
    903.17 = 903.17
  4. Calculate Produced Activity
    Produced Activity
    33417143459 = 33417143459

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