Patent ID: 6717153
Filing Date: 2004-04-06
Classification: G01T,G02B

Abstract:
A method of measuring for radioactive material, the method comprising:providing a first chamber containing a medium and providing a second chamber containing a medium, the first and second chambers being provided such that the medium can pass through them; placing an item to be measured for radioactive material in the first chamber in contact with the medium; sealing the first and second chambers; providing a detector for ions in contact with the medium of the first chamber; providing a detector for ions in contact with the medium of the second chamber; moving the medium about during measurements; determining the level of ions present in the medium of the first chamber and determining the level of ions present in the medium of the second chamber on one or more occasions; and correcting the level of ions in the first chamber according to the level of ions in the second chamber to give a corrected level, the corrected level of ions in the medium being indicative of a characteristic of the radioactive material.