Pulse tube refrigeration for detectors

Cournoyer, Michael E.; Pecos, J.M.; Chunglo, Steve D.; Bonner, C.; Maez, Rudy J.

doi:10.1007/s10967-012-2002-9

Cited by 3 publications

(2 citation statements)

References 9 publications

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“…In 2001, Timothy P Martinez and Cournoyer conducted a study at Los Alamos National Laboratory to explore the cost and benefit of using bismuth instead of lead to protect people from traditional radioactive sources Cournoyer. 4 They believe that bismuth is a non-hazardous substitute for the shielding of low-energy sources affected by the photoelectric effect or the radiation shielding of high-energy X-rays and gamma rays mainly affected by the interaction of electrons. It can provide adequate protection without affecting the productivity of workers.…”

Section: Introductionmentioning

confidence: 99%

Radiation shielding design and development of Bi/Ta/PU lead-free flexible textile composites

Chen

Peng

et al. 2023

Journal of Industrial Textiles

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Aiming at the difficulty of designing flexible shielding materials for lightweight and complex structures, the radiation shielding simulation model of coated fabric was established by SuperMC nuclear simulation software system and the γ-ray shielding performance of the material was predicted. Pb and Ta doped Bi/PU coated fabric composites were prepared by coating process. SEM, EDS, γ-ray shielding performance, mechanical properties, and wear resistance were tested. The results show that the simulated values of shielding performance are in good agreement with the measured values, the maximum deviation of the predicted value is 2.94% and the minimum is 0.25%. Doping Pb and Ta can increase the probability of the photoelectric effect and improve the γ-ray shielding performance of the material. When the doping amount of Ta is 5wt%, the shielding rate (simulation value) of Bi/Ta/PU coated fabric composites to 59.5 keV, 122 keV, and 184 keV γ-rays reaches 29.80%, 20.35%, and 8.09%, respectively, which is 3.13%, 2.32%, and 0.95% higher than that without doping. However, Ta is more environmentally safe and can replace Pb as a shielding additive. Doping auxiliary functional particles will improve the shielding performance but will reduce the material’s wear resistance and mechanical properties. After doping 5%Ta, the wear resistance index decreased by 6.81, and the tensile strength decreased by 4.5 MPa. The influence mechanism of process parameters on shielding performance is further revealed by visual analysis, which provides a new reference for the design of lead-free flexible shielding materials.

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Section: Introductionmentioning

confidence: 99%

Radiation shielding design and development of Bi/Ta/PU lead-free flexible textile composites

Chen

Peng

et al. 2023

Journal of Industrial Textiles

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“…Electromechanical cooling is an attractive choice, especially for portable HPGe detectors. Advances in Joule-Thomson technology coupled with HPGe detectors have been reported [3]. Electromechanical cooling systems (cryocooler) have become common for HPGe detectors.…”

Section: Introductionmentioning

confidence: 99%

Vibration Reduction in a Pulse Tube-Cooled High Purity Germanium Detector

et al. 2022

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High-purity germanium (HPGe) is a vibration-sensitive, high-resolution detector. It has been found that microphonic noise induced by vibration and electromagnetic interference from EMC causes energy resolution degradation in HPGe detectors. In this paper, to enhance the energy resolution of a pulse tube-cooled high purity germanium detector, a passive vibration isolation system for the portable pulse tube cooler (PTC) was employed and investigated. In order to evaluate the performance of the vibration isolation system, micro-vibration tests of the compressor with a vibration isolation kit and detector mounting interface were performed. Meanwhile, detector energy resolution and detector signal noise were tested, respectively, under the PTC, with the isolation system switched to either an on or off condition. The test results indicate that the effectiveness of passive vibration isolation techniques is confirmed, and no degradation was induced by PTC vibration on detector energy resolution.

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Ultralow Temperature (ULT) Cryogenic Arrangements

2022

Nuclear Electronics With Quantum Cryogenic Detectors

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Pulse tube refrigeration for detectors

Cited by 3 publications

References 9 publications

Radiation shielding design and development of Bi/Ta/PU lead-free flexible textile composites

Radiation shielding design and development of Bi/Ta/PU lead-free flexible textile composites

Vibration Reduction in a Pulse Tube-Cooled High Purity Germanium Detector

Ultralow Temperature (ULT) Cryogenic Arrangements

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