Use of active personal dosemeters in interventional radiology and cardiology: Tests in laboratory conditions and recommendations - ORAMED project

Toward Low‐Voltage and Bendable X‐Ray Direct Detectors Based on Organic Semiconducting Single Crystals

“…3. The minimum X-ray dose able to trigger the detection in 4HCB-based devices is 50 µGy s −1 , in line with the typical values for diagnostic medical applications (dose rates around 25 µGy s −1 [ 28 ] . Moreover, the here reported sensitivity of 4HCB-based detectors (about 0.1 µC cm…”

“…As shown in Figure 3 d, the signal-to-noise ratio is very good even at these extremely low dose rates. The minimum detectable dose rate sensitivity in 4HCB-based devices of 50 µGy s −1 is in line with the typical values for medical imaging and clinical analysis (presently dose rates around 25 µGy s −1 are required for such applications, [ 28 ] indicating that the performance of X-ray sensors based on OSSCs satisfi es the requirements for their application as ionizing radiation dosimeters. State-of-the-art detectors based on a-Se, that can be considered a benchmark photoconductor material for dosimetry applications, have a sensitivity of about 0.2 µC cm −2 R −1 , that is not so far from the performance of the here reported 4HCB detectors (about 0.1 µC cm −2 R −1 , if converted in the same unit of measure).…”

Colossal X‐Ray‐Induced Persistent Photoconductivity in Current‐Perpendicular‐to‐Plane Ferroelectric/Semiconductor Junctions

“…The broad‐spectrum X‐ray beam was generated by a copper tube (Bruker, D8 Advance) with an accelerating voltage of 40 kV and a low dose rate of ≈140 µGy s −1 . For comparison, typical dose rates are ≈1.4–2800 µGy s −1 for diagnostic medical applications . The X‐ray beam was centered on the sample and an illumination time of ≈10 s was applied to trigger the PPC effect.…”

Use of a CMOS Image Sensor for an Active Personal Dosimeter in Interventional Radiology

“…13. It should be pointed out that the linear correlation holds for both operational modes, pulsed and continuous, and that this is a step forward with respect to the response reported for other dosimetric systems, where the difference among the two modes reached levels of 20%-40% [11].…”

“…There is a linear response with the dose equivalent and satisfactory response at low energies where continuous X-ray beams are used, but with pulsed X-ray beams, for most Active Personal Dosimeters, the response decreases as the dose equivalent rate increases (> 2 Sv/h) and decreases from 10% to 40% when the pulse frequency increases from 1 to 20 pps. Comparing the distribution of Active Personal Dosimeter response with passive 0018-9456/$31.00 © 2012 IEEE TABLE I FEATURES OF COMMERCIAL ACTIVE PERSONAL DOSIMETERS dosimeter response, a slight under-response with respect to passive dosimeters has been reported in [11]. It can also be noticed from Table I that most commercial Active Personal Dosimeters feature an energy range with a lower bound greater than the corresponding one for passive dosimeters (i.e., 10 keV), which are used as certified devices for radiation protection.…”