Eddy Current Test	Penetrant Test	Magnetic Particle Test	Visual Test
Radiographic Test	Ultrasonic Test	Magnetic Flux Leakage Test	Visual Test Using Fibrescope

Radiographic Test	Principle Application Advantage Limitation
Principle	Back
Radiographic test is a well-established technique. It uses X-ray or gamma-ray to produce an image of an object on film. The technique is widely used to detect internal flaws in weldments and castings.

Application	-	Most weld discontinuities including cracks, porosity, lack of fusion, incomplete penetration, slay, as well as corrosion and fit-up conditions.	Back
Advantage		(For Gamma Ray)	Back
	-	Permanent record-enables review by parties at a later date.
	-	Gamma sources may be positioned inside of accessible objects, i.e., pipes, etc., for panoramic technique radiographs.
	-	Energy efficient source requires no electrical energy for production of gamma rays.
		(For X-Ray)
	-	Adjustable energy levels, generally produces higher quality radiographs than gamma sources.
	-	Offers permanent record as with gamma ray.
Limitations		(For Gamma Ray)	Back
	-	Radiation is safety hazard-requires control of facilities or areas where radiation will be used and requires special monitoring of exposure levels and dosages to personnel.
	-	Sources (gamma) decay over their half-lives and should be periodically replaced.
	-	Gamma sources have a constant energy of output (wavelength) and cannot be adjusted.
	-	Gamma source and related licensing requirements are expensive.
	-	Radiography requires highly skilled operating and interpretive personnel.
		(For X-Ray)
	-	High initial cost of X-ray equipment.
	-	Equipment not generally considered portable, radiation hazard as with gamma sources, skilled operational and interpretive personnel required.