FOERFARANDE Før by means of the ATT STRAOLNING UTSAEND AV ETT ROENTGENROER utan att FOERSTOERA sample was MAETAFOERDELNINGEN FYLL- audio and / or BELAEGGNINGSMEDEL I TJOCKLEKSRIKTNINGEN of paper in, paperboard or the like OCH Halten from these two Medel Før TILLAEMPANDE of devices for the AV FOERFARANDET SAMT of devices for ANVAENDNINGARFOERFARANDET OCH

摘要

PCT No. PCT/FI83/00076 Sec. 371 Date Jul. 30, 1984 Sec. 102(e) Date Jul. 30, 1984 PCT Filed Nov. 30, 1983 PCT Pub. No. WO84/02191 PCT Pub. Date Jun. 7, 1984.A procedure and means for non-destructive measuring of the distribution in the thickness direction of the filler and/or coating materials in paper or cardboard. Radiation emitted by an x-ray tube is used to excite in the material component to be examined, its characteristic x-ray radiation, the intensity of this radiation being observed. Measurements are made on both sides of the specimen. The contents of other filler components are also determined by x-ray absorption measurements, and the base weight of the paper, e.g. by beta radiation absorption. Measurements of the characteristic radiation, elicited with constant energy x-ray radiation as well as absorption measurements of radiation obtained directly from the x-ray tube and of radiation produced in transformation targets are made in order to eliminate by calculation the disturbing interaction of the filler components. Alternatively, distribution measurements are made with the aid of characteristic radiation elicited with radiation from the x-ray tube varying in a known manner during the measuring cycle and by measuring its absorption followed by equivalent calculations.