Effects of High-Dose X-Ray Irradiation on the Hole Lifetime in Vacuum-Deposited Stabilized a-Se Photoconductive Films: Implications to the Quality Control of a-Se Used in X-Ray Detectors.
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| Title: | Effects of High-Dose X-Ray Irradiation on the Hole Lifetime in Vacuum-Deposited Stabilized a-Se Photoconductive Films: Implications to the Quality Control of a-Se Used in X-Ray Detectors. |
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| Authors: | Simonson, B.1 safa.kasap@usask.ca, Johanson, R. E.1, Kasap, S. O.1 safa.kasap@usask.ca |
| Source: | IEEE Transactions on Nuclear Science. Nov2020, Vol. 67 Issue 11, p2445-2453. 9p. |
| Subjects: | Digital mammography, Quality control, X-rays, Detectors, X-ray imaging, Electric fields, Ionizing radiation |
| Abstract: | Stabilized amorphous selenium (a-Se)-based digital flat-panel X-ray imaging detectors are widely used in modern mammography. The dependence of the hole lifetime, τh, in a-Se on high-dose X-ray irradiation under high electric fields is examined. The X-ray-induced effects on the samples were studied using conventional time-of-flight (TOF) and interrupted-field time-of-flight (IFTOF) techniques. The samples were placed under a high electric field (5–10 V/μm) and exposed to X-ray irradiation, after which TOF and IFTOF measurements were taken to find the hole drift mobility and lifetime after X-ray exposure. There was no observed change in the hole drift mobility but there was a large drop in the hole lifetime. The reduction in the hole lifetime depended only on the total or accumulated dose and the applied field. There was no dependence on the dose rate, over a range of 0.12–2.5 Gy/s, or on the X-ray photon energy, over a range of 50–90 keVp (corresponding to a mean photon energy of 31.9–44.7 keV). The implications of these findings can be seen through the calculation of the charge collection efficiency (CCE). The results show that the effects of X-ray irradiation on a-Se X-ray detectors are considerable when the detector is under an applied field during exposure, but are minimized when the operating field is high (corresponding to a high CCE) and the a-Se is of high-quality electronic grade material. [ABSTRACT FROM AUTHOR] |
| Copyright of IEEE Transactions on Nuclear Science is the property of IEEE and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Items | – Name: Title Label: Title Group: Ti Data: Effects of High-Dose X-Ray Irradiation on the Hole Lifetime in Vacuum-Deposited Stabilized a-Se Photoconductive Films: Implications to the Quality Control of a-Se Used in X-Ray Detectors. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Simonson%2C+B%2E%22">Simonson, B.</searchLink><relatesTo>1</relatesTo><i> safa.kasap@usask.ca</i><br /><searchLink fieldCode="AR" term="%22Johanson%2C+R%2E+E%2E%22">Johanson, R. E.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Kasap%2C+S%2E+O%2E%22">Kasap, S. O.</searchLink><relatesTo>1</relatesTo><i> safa.kasap@usask.ca</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22IEEE+Transactions+on+Nuclear+Science%22">IEEE Transactions on Nuclear Science</searchLink>. Nov2020, Vol. 67 Issue 11, p2445-2453. 9p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Digital+mammography%22">Digital mammography</searchLink><br /><searchLink fieldCode="DE" term="%22Quality+control%22">Quality control</searchLink><br /><searchLink fieldCode="DE" term="%22X-rays%22">X-rays</searchLink><br /><searchLink fieldCode="DE" term="%22Detectors%22">Detectors</searchLink><br /><searchLink fieldCode="DE" term="%22X-ray+imaging%22">X-ray imaging</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+fields%22">Electric fields</searchLink><br /><searchLink fieldCode="DE" term="%22Ionizing+radiation%22">Ionizing radiation</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Stabilized amorphous selenium (a-Se)-based digital flat-panel X-ray imaging detectors are widely used in modern mammography. The dependence of the hole lifetime, τh, in a-Se on high-dose X-ray irradiation under high electric fields is examined. The X-ray-induced effects on the samples were studied using conventional time-of-flight (TOF) and interrupted-field time-of-flight (IFTOF) techniques. The samples were placed under a high electric field (5–10 V/μm) and exposed to X-ray irradiation, after which TOF and IFTOF measurements were taken to find the hole drift mobility and lifetime after X-ray exposure. There was no observed change in the hole drift mobility but there was a large drop in the hole lifetime. The reduction in the hole lifetime depended only on the total or accumulated dose and the applied field. There was no dependence on the dose rate, over a range of 0.12–2.5 Gy/s, or on the X-ray photon energy, over a range of 50–90 keVp (corresponding to a mean photon energy of 31.9–44.7 keV). The implications of these findings can be seen through the calculation of the charge collection efficiency (CCE). The results show that the effects of X-ray irradiation on a-Se X-ray detectors are considerable when the detector is under an applied field during exposure, but are minimized when the operating field is high (corresponding to a high CCE) and the a-Se is of high-quality electronic grade material. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of IEEE Transactions on Nuclear Science is the property of IEEE and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1109/TNS.2020.3023687 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 9 StartPage: 2445 Subjects: – SubjectFull: Digital mammography Type: general – SubjectFull: Quality control Type: general – SubjectFull: X-rays Type: general – SubjectFull: Detectors Type: general – SubjectFull: X-ray imaging Type: general – SubjectFull: Electric fields Type: general – SubjectFull: Ionizing radiation Type: general Titles: – TitleFull: Effects of High-Dose X-Ray Irradiation on the Hole Lifetime in Vacuum-Deposited Stabilized a-Se Photoconductive Films: Implications to the Quality Control of a-Se Used in X-Ray Detectors. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Simonson, B. – PersonEntity: Name: NameFull: Johanson, R. E. – PersonEntity: Name: NameFull: Kasap, S. O. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 11 Text: Nov2020 Type: published Y: 2020 Identifiers: – Type: issn-print Value: 00189499 Numbering: – Type: volume Value: 67 – Type: issue Value: 11 Titles: – TitleFull: IEEE Transactions on Nuclear Science Type: main |
| ResultId | 1 |
