Solid State Microdosimetry With Heavy Ions for Space Applications

Self Cite

Abstract-The tissue equivalence of solid state silicon detectors in proton radiation fields was determined to improve the radiation protection applications of silicon detectors in aviation and space missions. The study was performed by means of Geant4 simulations. Results are presented showing that a simple geometrical scaling factor (~0.56) of linear dimensions is adequate to convert experimentally obtained microdosimetric energy deposition spectra in silicon to equivalent microdosimetric energy deposition spectra in water.

Section: Discussionmentioning

confidence: 99%

“…Applications of the technology include radiation protection for personnel in space and at nuclear facilities [3], radiation effects on microelectronics in space missions and aviation, dosimetry in medical physics [4,5] and radiobiological research [6].…”

Section: Authorsmentioning

confidence: 99%

Tissue Equivalence Correction in Silicon Microdosimetry for Protons Characteristic of the LEO Space Environment

Guatelli

Reinhard

Mascialino

et al. 2008

Self Cite

“…The diodes are rectangular parellelepiped (RPP) structures all in close proximity and connected in parallel for single read out as described in [5], [7]. These devices have been characterised in terms of charge collection [6] and tested for their performance in neutron fields [8], proton fields [9], [10], heavy ion fields for space applications [11] and radiation protection in mixed radiation fields [12].…”

Section: Introductionmentioning

confidence: 99%

Large Area Silicon Microdosimeter for Dosimetry in High LET Space Radiation Fields: Charge Collection Study

Livingstone

Prokopovich

Lerch

et al. 2012

Self Cite

Abstract-Silicon microdosimeters for the characterisation of mixed radiation fields relevant to the space radiation environment have been under continual development at the Centre for Medical Radiation Physics for over a decade. These devices are useful for the prediction of single event upsets in microelectronics and for radiation protection of spacecraft crew. The latest development in silicon microdosimetry is a family of large-area n-SOI microdosimeters for real-time dosimetry in space radiation environments. The response of n-SOI microdosimeters to 2 MeV H and 5.5 MeV He ions has been studied to investigate their charge collection characteristics. The studies have confirmed 100% yield of functioning cells, but have also revealed a charge sharing effect due to diffusion of charge from events occurring outside the sensitive volume and an enhanced energy response due to the collection of charge created beneath the insulating layer. The use of a veto electrode aims to reduce collection of diffused charge. The effectiveness of the veto electrode has been studied via a coincidence analysis using IBIC. It has been shown that suppression of the shared events allows results in a better defined sensitive volume corresponding to the region under the core electrode with almost 100% charge collection.

“…This approach has been applied to: fast neutron and charged particle radiation therapy [2]- [7], predicting single event upsets (SEUs) in micro and nano electronics [8], and assessing the biological risk posed to radiation workers, high altitude and space aviation crew [9], [10]. The microdosimetry approach has the advantage that no prior knowledge of the particles contained within the field is required.…”

Section: Introductionmentioning

confidence: 99%

A Cylindrical Silicon-on-Insulator Microdosimeter: Charge Collection Characteristics

Ziebell

Lim

Reinhard

et al. 2008

Abstract-A novel silicon-on-insulator microdosimeter for estimating the radiobiological effectiveness (RBE) of a mixed radiation field is presented. An ion beam induced charge collection study has confirmed the microdosimeter possesses well defined micron sized 3D cylindrical sensitive volumes. An array of these SVs has the capability of studying the track structure of high energy heavy ions typical of a deep space environment.