Patent ID: 6083755
Filing Date: 2000-07-04
Classification: G01N,Y10T

Abstract:
A method for determining the cleaning action on a cleaned object, comprising the steps of:a) providing a predetermined soiling substance;b) adding to said soiling substance a radioactive marker having a half life period T, said soiling substance provided with said radioactive marker having together a first mass m.sub.0 and a radiation;c) measuring said first mass m.sub.0 ;d) simultaneously with said measuring of said first mass m.sub.0 measuring a first intensity I.sub.0 of said radiation and starting a measurement of time t;e) at least partially inserting said object into said soiling substance provided with said radioactive marker such that a second mass m.sub.1 of said soiling substance provided with said radioactive marker is introduced into at least a portion of said object, thereby, contaminating said object;f) cleaning said object;g) measuring a third intensity I.sub.2 of said radiation at a moment in time t.sub.2 ;h) determining a third mass m.sub.2 of a soiling having remained on said object after said step of cleaning according to the formula: ##EQU5## where r.sub.(r, . . . ) is a predetermined proportionality function for taking into account the dissociative behaviour of bonding between the radioactive marker and the object as a carrier the third mass m2 being used as an indicator of the cleaning action.