T.O. 33B-1-1
Glossary 61
PARALLEL MAGNETIZATION: A magnetic field induced in a piece of magnetizable material that is placed parallel
to a conductor carrying an electric current.
PARAMAGNETIC (MT): Materials in which the magnetic permeability is slightly greater than one. These materials
are classified as nonmagnetic with a permeability of one for purposes of eddy current inspection. A material which can
be slightly magnetized, but not sufficiently to permit magnetic particle inspection.
PART: A term used to refer to a manufactured article that is being inspected.
PARTICLE: A minute constituent of matter with a measurable mass, such as a neutron, proton, or meson.
PARTICLE MOTION (UT): Movement of particles in an article brought about by the action of a transducer.
PARTICLE (RT): A minute constituent of matter with a measurable mass, such as an electron, neutron, proton, or
meson.
PARTICULATE RADIATION (RT): Radiation consisting of charged or uncharged atomic particles.
PARTING LINE: The line along which a pattern is divided for molding or along which the sections of a mold separate.
PASTE (MAGNETIC): Finely divided, ferromagnetic particles in paste form used in preparing wet suspensions
magnetic particle inspection.
PEAK VOLTAGE (RT): The maximum value achieved by a varying voltage.
PENETRABILITY (PT): The property of a penetrant that causes it to find its way into very fine openings, such as
cracks.
PENETRAMETER (RT): A device employed to obtain evidence on a radiograph that the technique used was
satisfactory. It is not intended for use in judging the size of discontinuities nor for establishing acceptance limits for
materials or products.
PENETRAMETER SENSITIVITY (RT): See SENSITIVITY, RADIOGRAPHIC.
PENETRANT (PT): A liquid of high surface tension and high capillary action which is a vehicle for a colored or a
fluorescent dye, used to penetrate into the defect and detect surface discontinuities.
PENETRANT INDICATION: Readings that mark or denote the presence of material defects.
PENETRANT, POST EMULSIFIABLE (PT): A penetrant that requires the application of a separate emulsifier to
render the surface penetrant water-washable.
PENETRANT REMOVER (PT): A penetrant remover is a solvent-type liquid used to clean penetrants from the surface
of a material.
PENETRANT SENSITIVITY (PT): Penetrant sensitivity is the ability of the penetrant, processing technique, and
developer to detect surface-connected discontinuities and provide an indication visible to the unaided eye.
PENETRANT, VISIBLE (PT): A penetrant that is characterized by an intense visible color, usually red, that allows it
to give contrasting indications on a white developer background.
PENETRANT, WATER-WASHABLE (IT): See WATER-WASHABLE.
PENETRATION: The maximum depth from which indications can be measured in a material.
