Suitability of LiF:Mg,Cu,P and Al2O3:C for Low Dose Measurements in Medical Imaging

Duggan, Lisa; Sathiakumar, C.; Warren‐Forward, Helen; Symonds, M.; McConnell, P.; Smith, Tony; Kron, Tomas

doi:10.1093/oxfordjournals.rpd.a032888

Cited by 14 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Only a few reports have studied the performance of LiF:Mg,Cu,P TLDs in neonatal X-ray dosimetry. An excellent linearity in the mGy-mGy range as well as reproducibility at calibration dose levels (mGy to cGy) of 3% has been reported by Duggan et al [8]. Annealing, irradiation and read-out experiments were performed to verify the credibility of the TLD chips in their sensitivity and usefulness in this study.…”

Section: Direct Methods Of Measurementsupporting

confidence: 63%

Radiation dose quantities and risk in neonates in a special care baby unit

Armpilia

Fife²,

Croasdale³

2002

BJR

View full text Add to dashboard Cite

Radiographs are taken in the neonatal period most commonly to assist in the diagnosis and management of respiratory difficulties. Frequent accurate radiographic assessment is required and a knowledge of the radiation dose is necessary to justify such exposures. A survey of radiation doses to neonates from diagnostic radiography (chest and abdomen) has been carried out in the special care baby unit of the Royal Free Hospital. Entrance surface dose (ESD) was calculated from quality control measurements on the X-ray unit itself. Direct measurement of radiation doses was also performed using highly sensitive thermoluminescent dosemeters (TLDs) (LiF:Mg,Cu,P), calibrated and tested for consistency in sensitivity. ESD, as calculated from exposure parameters, was found to range from 28 microGy to 58 microGy, with a mean ESD per radiograph of 36+/-6 microGy averaged over 95 examinations. ESDs as derived from TLD crystals ranged from 18 microGy to 58 microGy for 30 radiographic examinations. The mean energy imparted, the mean whole body dose per radiograph and the mean effective dose were estimated to be 14+/-8 microJ, 10+/-4 microGy and 8+/-2 microSv, respectively. Assuming that neonates and fetuses are equally susceptible to carcinogenic effects of radiation, which involve an overestimation of risk, the radiation risk of childhood cancer from a single radiograph was estimated to be of the order (0.3-1.3) x 10(-6). Radiation doses compared favourably with the reference values of 80 microGy ESD published by the Commission of the European Communities in 1996, and 50 microGy published by the National Radiological Protection Board in 2000.

show abstract

Section: Direct Methods Of Measurementsupporting

confidence: 63%

Radiation dose quantities and risk in neonates in a special care baby unit

Armpilia

Fife²,

Croasdale³

2002

BJR

View full text Add to dashboard Cite

show abstract

“…Another reason could be the relatively high effective atomic number of the Al 2 O 3 (Z eff ¼ 11.28), 17 which causes the material to exhibit an over-response to low energy photons as a result of high contribution from the photoelectric effect. 5,10,[18][19][20] One of the first reported uses of OSL dosimetry in diagnostic radiology came from Aznar 21 where the dosimeters were used to measure entrance and exit in vivo doses in film=screen mammography. Their results indicate that the presence of the OSLDs did not interfere with the diagnostic quality of the mammograms and, more importantly, that the measurements showed good reproducibility (3%) and linearity, but did demonstrate an energy dependence.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of an OSLD in the diagnostic energy range

2011

View full text Add to dashboard Cite

OSLDs exhibited good batch homogeneity (<5%) and reproducibility (3.3%), as well as a linear response. In addition, they showed no statistically significant difference with TLDs in CT measurements (p > 0.1). However, high uncertainty (42%) in the dose estimate was found as a result of relatively high accumulated dose. Furthermore, nanoDots showed high angular dependence (up to 70%) in low kVp techniques. Energy dependence of about 60% was found, and correction factors were suggested for the range of energies investigated. Therefore, if angular and energy dependences are taken into consideration and the uncertainty associated with accumulated dose is avoided, OSLDs (nanoDots) can be suitable for use as point dosimeters in diagnostic settings.

show abstract

“…Commonly utilized materials in solid-state dosimeters are LiF in combination with Mg, Cu, P and Al 2 O 3 , for low-dose dosimetry [9,10]. Sodium iodide doped with thallium (NaI:Tl) is probably the most used dosimeter for gamma detection [11].…”

Section: Mosfet Sensorsmentioning

confidence: 99%

Tackling the Problem of Dangerous Radiation Levels with Organic Field-Effect Transistors

Valitova¹,

Zhang²,

Sayago³

2020

Integrated Circuits/Microchips

View full text Add to dashboard Cite

Accurate, quantitative measurements of ionizing radiation, commonly employed in medical diagnostic and therapeutic applications are essential prerequisites to minimize exposure risks. Common examples of radiation detectors include ionization chambers, thermoluminescent dosimeters, and various semiconductor detectors. Semiconductor dosimeters such as p/n type silicon diodes and MOSFETs have found widespread adoption due to their high sensitivity and easy processing. A significant limitation of these devices, however, is their lack of tissue equivalence. The high atomic number (relative to soft tissue) of silicon causes these devices to over-respond to photon beams that include a significant low energy component, for example, 1-10 kV, due to an enhanced photoelectric interaction coefficient. Organic field effect transistors (OFETs) are capable of providing tissue equivalent response to ionizing radiation in order to monitor more accurately the risk of exposure in medical treatments. This chapter presents the possibility to use different types of OFETs as ionizing and X-ray radiation dosimeters in medical applications.

show abstract

Suitability of LiF:Mg,Cu,P and Al2O3:C for Low Dose Measurements in Medical Imaging

Cited by 14 publications

References 0 publications

Radiation dose quantities and risk in neonates in a special care baby unit

Radiation dose quantities and risk in neonates in a special care baby unit

Characteristics of an OSLD in the diagnostic energy range

Tackling the Problem of Dangerous Radiation Levels with Organic Field-Effect Transistors

Contact Info

Product

Resources

About