TPM-C - Vendor Special Session North 224AB 14:30 - 15:30
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TPM-C.1
14:30 Thermoluminescent Dosimetry, Low-level Signal Analysis MR Ramlo*, Thermo Fisher Scientific
; Ma Ramlo
Abstract: To facilitate in the assessment of dose, when the readings have little occupational dose and most of the acquired signal is due to background, a thorough understanding of the collected, low-level, thermoluminescent (TL) signal is valuable. At low levels of exposure, near the lower limit of detection of the system as with most measurement systems, various independent components of the collected signal increase in their relative importance as the true signal decreases.
The key principles for understanding low-level TL dosimetry results will be explored with an emphasis on low-level signals, such as spectral emission, reader optics, infrared light and the fading properties of the TL material. Potential sources of non-ionizing signals, how to recognize those signals and techniques for their reduction will also be covered. Examples are presented as well as experimental evidence and performance benchmarking. This knowledge will be helpful to anyone who wants a better understanding of assessing low-level doses using TL dosimetry, beyond the consideration of only the thermoluminescence integral.
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TPM-C.2
14:45 Thermo Fisher Scientific NetDose Dosimetry Solution MJ Ramlo*, Thermo Fisher Scientific
Abstract: Thermo Fisher Scientific introduces a new family of passive-active personnel dosimeters called NetDose, beginning with its Gamma-only design, along with the NetDose Dosimetry Solution. Incorporating patented technology, the dosimeter meets the performance requirements of ANSI N13.11 and IEC 62387, and meets all the regulatory requirements for deployment in North America and the European Union.
Deploying the dosimeter is seamless to the wearer and offers simplicity and automation to the administrator(s) as well as providing real-time support. NetDose personnel dosimetry systems are highly scalable: they utilize secure Bluetooth communication from a selection of ‘reading’ devices, including personal cellphones, and secure, multi-channel, Bluetooth gateways.
Here we will present the fundamentals of building and deploying a NetDose, Dosimetry Solution. We will show or demonstrate aspects of the cloud-based administration tools. Select results of our performance testing, including energy response, angular response, linearity, over-response, power and environmental performance testing will be shown.
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TPM-C.3
15:00 Optimizing Co-60 Source Composition for Radiation Effects Testing with the Model GR420 GS Mickum*, Hopewell Designs, Inc.
Abstract: Hopewell Designs, Inc. has developed a turn-key solution for Radiation Effects Testing with the design of the Model GR420. The GR420 provides a dose rate of above 5 Gy/s with unparalleled uniformity due to the capability to rotate the annular ring of sources around the central irradiation chamber. This research investigated the optimization of Co-60 source pencils loaded into the annual ring of the GR420. Individual source pencils may be loaded as slugs, homogenous metal cylinders, separated by spacers or may alternatively be loaded with pellets, an accumulation of beads of varying specific activity. Monte Carlo methods were developed to analyze iterative changes to source composition and the results were benchmarked with physical measurements using alanine dosimetry. Discussions with source providers allowed for research results to influence the design of source pencils. This allowed for idealized uniformity at initial loading as well as the long-term uniformity as resourcing the irradiator becomes required. Results of the dose uniformity improvements are compared to legacy self-contained irradiator systems.
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TPM-C.4
15:15 Pixelated CdZnTe 3D Technology Applications in Nuclear Power, Medicine & IAEA Safeguards Instrumentation W Wang*, H3D, Inc.
; D Goodman, H3D, Inc.
Abstract: The state-of-art advancement of CdZnTe gamma cameras launched by the University of Michigan over the past 20 years under the US Department of Defense sponsored research is now in use at over 80% of the US and Canadian nuclear power plants. The H3D CdZnTe gamma cameras verify the adequacy of temporary shielding, contamination control, PWR Crud Burst isotopic mapping and radwaste shipment surveys. The wide adoption of the detector has led to new applications in homeland security, safeguards on nuclear materials as part of the missions of the IAEA and nuclear emergency response. IAEA organized a gamma-ray imaging workshop and conducted blind testing on gamma-ray systems developed by eight different organizations in the world. H3D's 3-D CdZnTe gamma cameras were selected for deployment at IAEA for international nuclear safeguards applications.
The position-sensitive, 3-dimensional CdZnTe room temperature semiconductor gamma-ray spectrometers and imagers are being evaluated for medical applications including proton beam therapy dose measurements, PET and radionuclide isotopic imaging. New funding from US DOE for sustainable nuclear technologies to develop spectra software will be discussed.
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