Glenwood, IL, United States
Glenwood, IL, United States
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A low-power wireless ionizing radiation measurement system is present that is intended to be used in a wearable dosimeter for occupational radiation monitoring. The detector element is a custom MOS capacitor that traps holes in proportion to the amount of ionizing radiation incident upon the detector, thus permanently causing a lateral shift in the CV-curve (toward more negative threshold voltage). The circuit measures the capacitance value of several redundant sensors at a given voltage in the depletion region, records this value over time and occasionally transmits the stored values to a base station. From the change in capacitance, the dose that has been delivered can be determined.


Patent
Landauer and Purdue Research Foundation | Date: 2015-09-30

A low-power wireless ionizing radiation measurement system is present that is intended to be used in a wearable dosimeter for occupational radiation monitoring. An apparatus is provided comprising a switching interface, wherein the switching interface alternates between a first switching state and a second switching state. In the first switching state, a radiation-sensitive metal oxide semiconductor capacitor (MOSCAP) is coupled to an external biasing source. In the second switching state, the radiation-sensitive MOSCAP is coupled with reversed polarity relative to the first switching state to a capacitive readout circuit to thereby allow for high-resolution real-time electronic measurement of a radiation-induced capacitance response.


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.


Patent
Landauer and Purdue Research Foundation | Date: 2015-09-30

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


Patent
Landauer | Date: 2016-07-25

A portable and wearable radiation dosimeter has a wearable housing. There is an optically stimulated luminescent (OSL) radiation sensing element removably mounted in the wearable housing so that the OSL radiation sensing element can be removed and read by an external OSL reader. There is also a fluorescent nuclear track detector (FNTD) radiation sensing element removably mounted in the wearable housing so that the FNTD radiation sensing element can be removed and read by an external FNTD reader. At least one on-board reader for at least one of the OSL and FNTD radiation sensing element for determining information about the radiation exposure of the sensing element while the sensor remains mounted in the housing, preferably using a different mode of reading than either OSL or FNTD.


Patent
Landauer | Date: 2015-04-08

Described is a portable dosimeter reader that is small in size and light in weight


Patent
Landauer | Date: 2015-04-08

Described is a portable dosimeter reader that is small in size and light in weight


Patent
Landauer | Date: 2015-05-19

Described is device comprising dosimeter for measuring one or more doses of radiation; and an RFID tag comprising an antenna for communicating with an RFID tag reader and non-volatile memory for storing data therein.


Patent
Landauer | Date: 2015-04-08

Described is a portable dosimeter reader that is small in size and light in weight


The invention resides in an apparatus comprising an LED light source (134) for emitting a green illumination light (132) for illuminating an optically stimulated luminescence (OSL) sensor, a photodetector (162) for detecting of green luminescent light emitted by the OSL sensor, a pulse counter for counting photon pulses generated by a photodetector based on photons of luminescent light emitted by the OSL sensor and counted by the photodetector, and a microprocessor (166) for controlling the LED light source and the photodetector and the pulse counter. The microprocessor controls when the LED light source, the photodetector and the pulse counter are switched between an on state and an off state. The pulse counter is part of the microprocessor, and the microprocessor determines a radiation dose of one type of ionizing radiation to which the OSL sensor has been exposed based on the photon pulses counted by the pulse counter.

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