Calculator (formerly accessible on: www.nuk.bieganski.org)

General math & medicine options
Arithmetic mean and standard deviation
Regression of points to straight line, correlation coefficient
Finding of natural divisors
The highest common divisor
Quadratic equation
Time difference
Estimation of some human biometric parameters
Concentration conversion
Calculations related to nuclear physics
Examples of application of the programs below are accessible here .

Simple radioactive decay (1 radioactive nuclide: A → B)

Successive radioactive decay (2 radioactive nuclides: A → B → C)

Successive radioactive decay (3 radioactive nuclides: A → B → C → D)

Conversion of activity units (traditional into SI-derived and vice versa)

Conversion of mass into activity and vice versa (mass-units into activity-units and vice versa)

Calculations related to nuclear medicine
Instruction for the programs below is accessible here .

(1.)

Calculation of thyroid volumen on the basis of the lobes diameters

(2.)

Calculation of (radio)nuclide uptake (f.e. uptake of radioiodine in the thyroid)

(2a.)

Calculation of uptake of I-131 in the thyroid (This program can be saved as a file and launched in another PC, a browser with HTML and

JavaScript is necessary; in Polish).

(3.)

Calculation of radioiodine dose (simplified)

(4.)

Kinetic modeling I. (effective half-time, maximal uptake and others, based on a series of measures) - for radionuclide therapy

(5.)

Kinetic modeling II. (effective half-time, maximal uptake and others, based on three measures) - for radionuclide therapy

(6.)

Calculation of dose of radioiodine or another radionuclide for treatment (modified Marinelli-formula)

(7.)

Dosimetry of α- and β-radiation
(8.)

Dose rate and absorbed dose of γ radiation (in a distance from a point source)

Successive radioactive decay
Here, you can calculate tha quantity of the radioactive daughter and granddaughter nuclide arising through the decay of the mother nuclide. Physical half-times of the nuclides and the time elapsed, and the nuclides quantities have to be entered in the same units . The calculations are based on Bateman-equations and their limits. A chart will be dynamically generated to the result.
You may need to hit the F5-key to get the right chart.

If you need to calculate the time difference between two time points ("time elapsed"), this algorithm can be helpful.

The decay goes according to the following equation:
nuclide 1 → nuclide 2 → nuclide 3 → nuclide 4

Abbreviations used:
T_{1/2(1)} - half-time of the nuclide 1
T_{1/2(2)} - half-time of the nuclide 2
T_{1/2(3)} - half-time of the nuclide 3
f_{(1→2)} - branching ratio - the fraction of the nuclide 1, which decays to the nuclide 2; the remainder decays in another way
f_{(2→3)} - branching ratio of the nuclide 2
t - time elapsed
N_{0(1)} - quantity (f.e., number of atoms) of the nuclide 1 at the beginning
N_{0(2)} - quantity (f.e., number of atoms) of the nuclide 2 at the beginning
N_{0(3)} - quantity (f.e., number of atoms) of the nuclide 3 at the beginning
N_{t(1)} - quantity (f.e., number of atoms) of the nuclide 1 after the time t
N_{t(2)} - quantity (f.e., number of atoms) of the nuclide 2 after the time t
N_{t(3)} - quantity (f.e., number of atoms) of the nuclide 3 after the time t
A_{0(1)} - activity of the nuclide 1 at the beginning
A_{0(2)} - activity of the nuclide 2 at the beginning
A_{0(3)} - activity of the nuclide 3 at the beginning
A_{t(1)} - activity of the nuclide 1 after the time t
A_{t(2)} - activity of the nuclide 2 after the time t
A_{t(3)} - activity of the nuclide 3 after the time t