2000
DOI: 10.1097/00004032-200008001-00007
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Dose Rate Limitations of Integrating Survey Meters for Diagnostic X-Ray Survevs

Abstract: Medical and health physicists are often called upon to measure scatter and evaluate shielding for diagnostic x-ray installations. As exposure times are typically too short to allow rate meters to be successfully used, integrating survey meters are often employed. Pressurized survey meters are particularly valuable because of their increased sensitivity. In practice, some integrating survey meters may give erroneous results under typical measurement conditions.

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Cited by 109 publications
(86 citation statements)
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“…Moreover, the sensitivity of the detector based on repaired CsPbBr 3 microcrystal thick film without external bias was over 20 times stronger than that of the currently commercial α‐Se X‐ray detectors working at a much higher field of 10 V µm −1 (20 µC Gy air −1 cm −2 ) . In addition, the low detectable X‐ray dose rate of X‐ray photodetector based on CsPbBr 3 microcrystal thick film is 0.053 µGy air s −1 at zero bias, which is much lower than that required for regular medical diagnostics (5.5 µGy air s −1 ) . This makes it possible to receive fewer radiation dose when people need medical or safety checks.…”
Section: Comparison Of the Relevant Device Parameters Of The X‐ray Dementioning
confidence: 93%
“…Moreover, the sensitivity of the detector based on repaired CsPbBr 3 microcrystal thick film without external bias was over 20 times stronger than that of the currently commercial α‐Se X‐ray detectors working at a much higher field of 10 V µm −1 (20 µC Gy air −1 cm −2 ) . In addition, the low detectable X‐ray dose rate of X‐ray photodetector based on CsPbBr 3 microcrystal thick film is 0.053 µGy air s −1 at zero bias, which is much lower than that required for regular medical diagnostics (5.5 µGy air s −1 ) . This makes it possible to receive fewer radiation dose when people need medical or safety checks.…”
Section: Comparison Of the Relevant Device Parameters Of The X‐ray Dementioning
confidence: 93%
“…This is slightly lower than that of regular medical diagnostics (5.5 μGy air s −1 ) based on active personal dosimeters (ADPs). [ 24 ] The fluctuations of dark and X‐ray‐induced currents at different biases are free of current drift (Figure S11D,E, Supporting Information). We derived the charge collection efficiency at dose rates from 9.62 to 57.7 μGy air s −1 at different biases from 2 to 50 V. The highest gain factor was determined to be ≈283% at a dose rate of 9.62 μGy air s −1 and 50 V (Figure S11F, Supporting Information).…”
Section: Figurementioning
confidence: 99%
“…[1] Importantly, this sensitivity is two orders of magnitude higher than those of conjugated crystals (See more details in Table S5, Supporting Information). [23][24][25] This is currently the highest sensitivity for metalfree perovskites. These results indicate a great advantage of the DABCO-NH 4 Br 3 crystal for X-ray detection, which can achieve comparable sensitivity with or even higher sensitivity than metal-based X-ray detectors.…”
mentioning
confidence: 99%
“…This value is the lowest among perovskite thin film detectors [39,46,58] and it compares well with other thick perovskite X-ray detectors, [18,34] while also being considerably below the medical requirements for diagnostics (≈5 Gy s −1 ). [59,60] We also compare the influence of HTL by examining the performance of PEDOT/Per/PCBM/BCP (Figure 2a) and NiO x /Per/PCBM/BCP (LC) (Figure 2c) detector architectures. While devices that use either NiO x or PEDOT:PSS HTL have comparable (that of NiO x is only slightly higher) sensitivities ( Figure 1c and Figure S2, Supporting Information), NiO x /Per/PCBM/BCP detectors show exceptionally low dark current.…”
Section: Pcbm-based Devicesmentioning
confidence: 99%