Free radiographic testing calculators: inverse square law, isotope source decay, exposure time correction, geometric unsharpness (Ug), and half-value layer shielding, for industrial radiographers using Ir-192, Co-60, Se-75, and X-ray.
Calculates the basic interpolated spatial resolution for the duplex wire gage per ASTM 2002.
Auto-calculates:
M_min (minimum geometric magnification)
Max SOD — since SOD = SDD / M_min
Converts SRb from microns to inches for you and shows that conversion
Built-in sanity check — warns if the calculated SOD ever comes out larger than SDD (a sign something was entered wrong), since SOD must always be less than SDD by definition.
This combines geometric unsharpness (Ug) — blur from the focal spot and setup geometry — with the detector's own resolution (SRb) to get the total unsharpness in the image, then divides by the magnification (v) to "normalize" it back to the size it would appear at the object. This normalized value, UIm, is what you compare against your acceptance criteria.
SNR compares the average pixel value in your image (the signal) to the amount of random noise (σ, the standard deviation of that pixel value). A higher SNR means a cleaner, more reliable image.
Calculates exposure time for various CR PIP's using Gamma Ray sources
For educational purposes only use at your own risk. Verify your caculations before making critical descisions.
Calculates the decay of radioactive isotopes when Half-life, age and inital activity are known.
Calculates the distance for gamma ray sources to the radiation boundary when activity, desired dose rate and isotope are given. The calculator assumes that the activity is in Curies (Ci) and the desired dose rate is in mrem/hr. The calculations assume no shielding is used.
Calculates the distance for x-ray sources to the radiation boundary when, desired dose rate and I1 are given. The calculations assume no shielding is used.
This Calculator will work for either x-ray or gamma when I1 is measured
Calculates geometric unsharpness from focal spot or source size (F), object-to-detector distance (t), and source-to-object distance (D₀) using Ug = F·t / D₀. Compare the result against the code limit — ASME Section V allows Ug up to 0.020 in. for material under 2 in. thick, with larger limits for thicker sections. Increase source-to-object distance or reduce source size to lower Ug.
This calculator provides the maximum source to object distance for radiographic set-ups when it is desired to maintain a required geometric unsharpness in the radiographhic image.
Calculates the penetrameter sensitivity achieved when base metal t, IQI t and IQI Hole visualized are given.
Gives the CNR for digital radiography when the mean pixel value of base metal and IQI are given and the Std.Dev is given for the IQI
These calculators are for educational use only. Always consult with qualified radiation safety professionals.