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How is RT exposure time calculated?

Exposure time depends on source activity, source type, material thickness, film type, and source-to-film distance. Use the formula: Time = (Strength Factor × Thickness Factor) / (Activity × Film Factor).

What is the difference between Ir-192 and Co-60 for radiography?

Ir-192 is suitable for steel up to 40mm, while Co-60 is used for thicker sections (40-100mm). Co-60 has higher energy but requires longer exposure times and more shielding.

rt exposure · Engineering Calculator

RT Exposure Time Calculator for Ir-192 Source on 12mm Steel Plate

Formula

Exposure Time = (Source Strength Factor × Thickness Factor) / (Source Activity × Film Factor)

Governing Standard

ASME Section V Article 2, ISO 17636

Required Inputs

Source activity (Ci)
Source type (Ir-192/Co-60)
Steel thickness (mm)
Film type
Source-to-film distance (mm)

Output

Required exposure time (minutes)

Notes

For Ir-192 at 50 Ci activity, 12mm steel plate, type II film, and 600mm SFD, the exposure time is approximately 1.5 minutes. Always verify with exposure charts for the specific source and film combination.

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