Modelling CMOS radiation tolerance in the high-dose range

Holmes-Siedle, Andrew; Christensen, Poul; Adams, L.; Seifert, Christian

doi:10.1109/radecs.1995.509775

Cited by 31 publications

(72 citation statements)

References 9 publications

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“…The entire actual dose from PET scan and gamma scan or Tc-99 studying case was about (5-13) times the international average effective dose from background radiation over 1 year that is assessed as (2.4 mSv). Table (1) will state the effective dose or radiation exposure for each case. Figure1 shows the effects of radiation exposure on Red Blood Cell RBC count before and after radiation exposure.…”

Section: Resultsmentioning

confidence: 99%

“…The radiant energy amount is placed per substance unit mass, identified as the absorbed dose. When living tissues absorb the radiation, both of the radiation's type and the absorbed dose are significant in defining the damage degree that might happen [1][2][3]. External exposure of radiation is occurring when the body is exposed to penetrating radiation from an external source while the internal one involves contamination with radioactive material [4].…”

Section: Introductionmentioning

confidence: 99%

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Effect of radiation exposure on function human body by CBC parameter for workers in nuclear medicine field

Lafta

Allawi²,

Mahmood³

et al. 2023

J. Phys.: Conf. Ser.

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In this study, eight cases of workers in gamma camera scans and Positron Emission Tomography (PET/CT scan) fields (employed for various medical diagnoses) had their complete blood counts (CBCs) assessed. From the first hour of work until the last, the investigation of radiation’s impact on hematology was ongoing. By using a personal dose meter (Geiger Badge), the radiation exposure reading for a whole workday is directly recorded in (μSv). The study concluded that while the number of WBC count increased for all workers after radiation exposure, the number of RBC count decreased after exposure, suggesting that RBC amount may be a reliable indicator of exposure degree.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of radiation exposure on function human body by CBC parameter for workers in nuclear medicine field

Lafta

Allawi²,

Mahmood³

et al. 2023

J. Phys.: Conf. Ser.

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show abstract

“…However, the overall duration of the experiment was limited by the irradiation facility available time, and because of this, it was not possible to repeat some experimental points. As a first approximation, the attenuation of electromagnetic radiation in the material is expected to follow a Lambert's law 26 ∝ e −ð μ ρ Þρx , consequently the dose deposited in the cylindrical coupon exhibits a similar decreasing exponential profile along the coupon rotation axis. This profile is characterized by the total mass attenuation coefficient μ ρ whose value has been estimated by measuring experimentally the dose in water behind ZERODUR ® coupons exhibiting different thicknesses, thus determining μ ρ ¼ 0.0562 cm 2 :g −1 for E ¼ 1.25 MeV.…”

Section: Irradiation Configurationmentioning

confidence: 99%

Comprehensive review of the effects of ionizing radiations on the ZERODUR® glass ceramic

Carré

Kirchhoff

Hull

et al. 2023

J. Astron. Telesc. Instrum. Syst.

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The low thermal expansion glass ceramic ZERODUR ® has a long and successful history in spaceborne optical applications. This material is especially used where precise shape invariance is required, i.e., for the mirror substrates dimensional stability when subject to temperature gradients and transients. In space, temperature may not be the exclusive driving force impacting the form stability; influence from ionizing radiations require considerations. The real impact of ionizing radiation on ZERODUR ® has become a matter of reconciling, on the one hand, in situ experience, e.g., that the secondary mirror of low Earth orbit (LEO) Hubble Space Telescope crossing the South Atlantic Anomaly or the overall optics of geosynchronous equatorial orbit (GEO) Chandra X-ray Observatory are not reporting any specific problems related to dimensional stability at the optical form level. On the other hand, finite element simulation based on early lab experiments of ZERODUR ® compaction are suggesting the opposite. This debate was brought to the forefront with the SILEX mission, where radiative ageing models were significantly overestimating the deformation experimentally observed on the lab replicas and were in even stronger disagreement with the observations collected over the mission. It has been speculated that an erroneous form factor in the physical model used to derive the phenomenological compaction law was responsible for these discrepancies. Following this hypothesis, we readdressed the effect of ionizing radiation induced by γ, electron, and proton fluences on ZERODUR ® compaction. For each of these, we present and discuss the irradiation source, the experimental setup, the sample design, and the measurement procedure as well as the observations. Consistent with the feedback gathered over many different space missions, we confirm that the compaction observed is significantly smaller than the estimations available in the prior literature.

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“…Shielding with 10 mm of lead attenuates gamma rays by only 10%. [ 1 ] Consequently, systems operating in high‐gamma radiation environments often opt for lighter shielding. Co‐60 sources, emitting gamma rays at an average energy of 1.25 MeV, serve as the standard for assessing ionization effects on electronics.…”

Section: Introductionmentioning

confidence: 99%

“…However, Co‐60 gamma rays primarily generate Compton electrons, which effectively simulate penetrative electrons and protons in the space radiation spectrum. [ 1,2 ]…”

Section: Introductionmentioning

confidence: 99%

Effects of Gamma Ray Radiation on the Performance of Microelectromechanical Resonators

et al. 2023

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While much radiation test data are available for metal‐oxide‐semiconductor (MOS) devices, research into the effects of radiation on microelectromechanical systems (MEMS) is in its relative infancy. Piezoelectrically transduced MEMS resonators have broad applications in signal processing, environmental monitoring, and navigation. Aluminum nitride (AlN), in particular, is an attractive piezoelectric because of its favorable fabrication characteristics and ease of integration into the complementary MOS (CMOS) manufacturing process. The utility of these devices in space and nuclear systems necessitates research into their performance in radiation environments. Resiliency and an established relationship between radiation dose and device behavior provide a critical tool for engineers in their design process. Multiple AlN‐based MEMS resonator designs are created and exposed the devices to 1 Mrad(Si) gamma irradiation from a Cobalt‐60 source while measuring scattering (S‐) parameters in situ. The experimental data are matched to a theoretical model to describe the change in frequency as a function of radiation‐induced displacement damage. It is demonstrated that the AlN‐based resonators are resilient against radiation‐induced charge‐trapping effects. Furthermore, a new method is presented of permanent frequency trimming MEMS resonators up to 30% of their bandwidth without modifying quality factor or motional resistance.

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Modelling CMOS radiation tolerance in the high-dose range

Cited by 31 publications

References 9 publications

Effect of radiation exposure on function human body by CBC parameter for workers in nuclear medicine field

Effect of radiation exposure on function human body by CBC parameter for workers in nuclear medicine field

Comprehensive review of the effects of ionizing radiations on the ZERODUR® glass ceramic

Effects of Gamma Ray Radiation on the Performance of Microelectromechanical Resonators

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