Landauer, Incorporated

Purdue Research Foundation

Daniel John Valentino

R Craig Yoder

P Alexander Walerow

Mark Raymond Salasky

James R Thistlethwaite, Iii

Sean Michael Scott

Brahim Moreno

Marc Million

Dimitrios Peroulis

A method and apparatus is disclosed for differentially altering the radiation response across multiple MOSCAP sensors by placing different thin gate materials with different atomic numbers on a series of MOS-based radiation sensors. The secondary electrons created in high-atomic weight materials (such as gold) at lower incident photon energy levels enable a tissue equivalent radiation response and radiations source identification/differentiation. This is a desirable alternative to using filters with different coefficients across a series of MOSCAP radiation sensor which will attenuate the signal and degrade the device form factor. The method and apparatus disclosed achieves the same functionality but with inherent gain instead of attenuation, thus increasing sensitivity. This will improve the minimum resolvable dose for x-rays and low-energy gammas (high-energy gammas will remain the same), and produces a response that can distinguish the energy level of incident radiation photon.

Variable metal multi-gate metal oxide semiconductor capacitor radiation sensor for improved gain and tissue equivalence

A low-power wireless ionizing radiation measurement system is provided that is intended to be used in a wearable dosimeter for occupational radiation monitoring.

Low-noise surface level MOS capacitor for improved sensor quality factor

Described is a radiation dosimeter including multiple sensor devices (including one or more passive integrating electronic radiation sensor, a MEMS accelerometers, a wireless transmitters and, optionally, a GPS, a thermistor, or other chemical, biological or EMF sensors) and a computer program for the simultaneous detection and wireless transmission of ionizing radiation, motion and global position for use in occupational and environmental dosimetry. The described dosimeter utilizes new processes and algorithms to create a self-contained, passive, integrating dosimeter. Furthermore, disclosed embodiments provide the use of MEMS and nanotechnology manufacturing techniques to encapsulate individual ionizing radiation sensor elements within a radiation attenuating material that provides a 'filtration bubble' around the sensor element, the use of multiple attenuating materials (filters) around multiple sensor elements, and the use of a software algorithm to discriminate between different types of ionizing radiation and different radiation energy.

Wireless, motion and position-sensing, integrating radiation sensor for occupational and environmental dosimetry

Described are a method and apparatus for determining based on motion data when an individual wearing a dosimeter is active. Also described are a method and apparatus for determining based on motion data whether an individual was wearing a dosimeter when the dosimeter was exposed to radiation. Also described are a method and apparatus for determining based on motion data whether a dosimeter was in a particular location when the dosimeter was exposed to radiation. Also described are a method and apparatus for determining based on motion data where on the body of an individual the individual was wearing a dosimeter when the dosimeter was exposed to radiation. Also described are a method and apparatus for determining based on motion data the probability that an individual is wearing a dosimeter that is assigned to the individual.

System for wireless, motion and position-sensing, integrating radiation sensor and energy harvester for occupational and environmental dosimetry

System for motion and activity correlation with dose for occupational and environmental dosimetry

An apparatus comprising: a radiation sensor having one or more radiation sensors and an on-board power harvester.

Energy harvester for wireless, motion and position-sensing, integrating radiation sensor for occupational and environmental dosimetry

Described is an apparatus, method and machine-readable medium for determining radiation dosages based on a solution vector for each radiation field and an objective function.

Algorithm for a wireless, motion and position-sensing, integrating radiation sensor for occupational and environmental dosimetry

Wireless, motion and position-sensing, integrating radiation occupational and environmental dosimetry

Described is a radiation dose calculation algorithm based upon the output of a radiation dosimeter including multiple sensor devices (including one or more passive integrating radiation sensors and optionally, a MEMS accelerometers, a wireless transmitters a GPS, a thermistor, or other chemical, biological or EMF sensors). The algorithm is used to convert the sensor output into dose values used to assess the exposure of personnel to ionizing radiation. Sensor output patterns are matched to stored empirically generated sensor outputs thru weighting and optimization calculation processes to determine personnel doses. Algorithm outputs can include personal dose equivalents, radiation types, radiation energy and radiation source identification. Dose calculations can be optimized for specific applications, and matched to different sets of measured data without changing the underlining software calculation programs.

Growing community of inventors

Naperville, IL, United States of America

Daniel John Valentino