The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 02, 2003
Filed:
Mar. 02, 2001
Ian Thomson, Nepean, CA;
Andrew Hartshorn, Kanata, CA;
Thomson & Nielsen Electronics Ltd., Nepean, CA;
Abstract
In a dosimeter probe comprising a semiconductor diode or a field effect transistor for monitoring levels of radiation during medical procedures, such as the treatment of tumors, the transistor or diode is fabricated epitaxially upon a surface of a substrate and a dummy die, i.e., a slab of material similar to that of the substrate, is positioned adjacent the substrate surface so as to overlie an active region of the transistor or diode and a relatively large area of the substrate surrounding the active region. The arrangement is such that, whatever the direction from which the radiation is incident upon the active region, its path through the device before arriving at the active region will have similar characteristics to the path the radiation takes upon leaving the active region.