Sarnoff Corporation

Uti Limited Partnership

Dalhousie University

Ian Hill

George Herbert Needham Riddle

Joseph Michael Carpinelli

Alasdair Syme

Gregory C Welch

Arthur D Hendsbee

Jon-Paul Sun

Seth McAfee

Jonathan Cann

Radiation dosimeters are disclosed whereby a passive multilayer substrate is provided to confer tissue equivalence. In an example embodiment, a multilayer substrate is formed over a semiconductor-based radiation sensing layer, where the multilayer substrate includes at least one low-atomic-number layer of having an effective atomic number that is smaller than that of water, and at least one high-atomic-number layer having an effective atomic number that is greater than that of water. The low-atomic-number layers and high-atomic-number layers are provided with respective thicknesses and compositions for modulating the dependence of the signal produced by the radiation dosimeter on photon energy, such that the signal, when calibrated to provide a measure of dose, exhibits approximate tissue-equivalence over a prescribed photon energy range. The multilayer substrate may be configured such that tissue equivalence is provided over an energy range including diagnostic and therapeutic energy ranges, spanning, for example, 20 keV to 5 MeV.

Tissue-equivalent dosimeter

PDI derivatives useful as opto-electronically active materials or for the synthesis of such materials. Certain compounds herein function as efficient electron acceptors and are useful as electron active components of electronic devices.

Nitrogen annulated perylene diimides for use as electron transport materials in organic electronic devices

A character display comprises fifty-nine segments arranged into rows and columns. Twenty eight of the fifty-nine segments define a periphery of the display, eleven additional segments define horizontal and vertical dividers that define four quadrants, and five additional segments are disposed in each of the four quadrants to define diagonals thereof.

Segmented character display

Growing community of inventors

Halifax, Canada

Ian Hill