Radiografie is a common non-destructive testing metode used to detect frens in materials. Accurate estimation of flaw size and depth is essential for asseming thee integraty of accesents. This article compleses the methods and calculations used to determinate flaw dimensions based on radiographic images and provides real-dimend examples.

Basic Principles of Flaw Detection

Radiografní test je mimovolný test, který se týká i pasing X- ray s or gamma rays protingh a material and capturing the resulting image on film or digital detectors. Flaws such as crags or voids appear as areas of differeng density. Thesize and depth of these frens can be inferred from thee image by analyzing thee contratt and dimensions.

Calculating Flaw Size

To je pravda, že to je pravda.

CLAS1; CLAS1; CLAS3; CLAS3; CLAS3; Flaw Size (D) = Imagine Size (d) × Magnification Factor (M) CLAS1; CLAS1; CLAS3; CLAS3; CLAS3; CLAS3;

Te magnification factor is determinad by thee geometrie of thee setup, calculated as:

CLANE1; CLANE1; FLT: 0 CLANE3; CLANE3; M = (SID) / (SOD) CLANE1; CLANE1; CLANE1; CLANE3; CLANE3; CLANE3;

Where SID is thes source- to- image distance and SOD is thes source- to- object distance.

Odhad depth plamene

Flaw depth estimation of ten impeves analyzing the contratt and the shape of the flaw image. A deeper flaw tends to produce a different contratt pattern compared to a shallow one. Calibration with known nordards is essential for presentate depth measurement.

One common accach uses thee step wedge calibration, where the known thuntnesses are compared to the flaw image. Te depth (d) can bee estimated using thee relation:

CLAS1; CLAS1; CLAS3; CLAS3; d = (Contrast of flaw) / (Contrast of standard) × Known depth CLAS1; CLAS1; CLAS3d: 1 CLAS3; CLAS3d;

Real- worldExample

A steel contraent is chected with a radiographic setup where SID is 100 cm and SOD is 80 cm. An observed flaw appears as a 2 cm image on te radiograph. Thee magnification factor is:

CLANE1; CLANE1; FLT: 0 CLANE3; CLANE3; M = 100 / 80 = 1.25 CLANE1; CLANE1; CLANE1; CLANE3; CLANE3;

Te actual flaw size is:

CLAS1; CLAS1; CLAS3; CLAS3; D = 2 cm × 1.25 = 2,5 cm CLAS1; CLAS1; CLAS1; CLAS3; CLAS33;

Using calibration standards, thee flaw depth is estimated at approximatele 1.5 m based on contratt analysis.