N = D² / (4λ), λ = c / f
Worked example 10 mm, 5 MHz probe on steel N = 21.19 mm reliable far field from 3N = 63.56 mm
NDT calculators · CERT
Training hours, exam grades, recertification dates and dose records. Each of the 5 shows the governing formula, a worked example and the standard it comes from.
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N = D² / (4λ), λ = c / f
Worked example 10 mm, 5 MHz probe on steel N = 21.19 mm reliable far field from 3N = 63.56 mm
Training hours, exam grades, recertification dates and dose records.
CERT Certification records
Minimum training hours and industrial experience months required for ISO 9712 certification by method and level, including the direct-entry summation rule.
ISO 9712
CERT Certification records
Expiry month of a five-year NDT certification, months remaining, when the recertification window opens, and when the annual near-vision test falls due.
ASNT · SNT-TC-1A
CERT Certification records
Recommended initial training hours and work experience by NDT method and level to SNT-TC-1A, with shortfall against hours already logged.
ASNT · SNT-TC-1A
CERT Certification records
Composite grade from general, specific and practical examination scores, with the 70 % per-part and 80 % composite pass rules and the practical score still needed.
ASNT · SNT-TC-1A
CERT Certification records
Running five-year effective dose total against the 20 mSv/year average and 50 mSv single-year limits, with remaining headroom and a projection to year end.
IAEA · ICRP
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