Improvement of analytical accuracy of EPR spectrometry by taking into account variations in the shapes of samples

Nagy, Vitaly; Plaček, J.

doi:10.1007/bf00321955

Cited by 25 publications

(24 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The shapes of the distributions of these two fields are bell-like, and the field intensities decrease to zero in the regions close to the cavity walls. (2000) and Nagy and Placek (1992). An example of similar measurements in a rectangular cavity is shown in Fig.…”

Section: Non-uniformity Of the Microwave And Modulation Fields In Thementioning

confidence: 82%

EPR dosimetry with tooth enamel: A review

Fattibene

Callens

2010

Applied Radiation and Isotopes

212

160

View full text Add to dashboard Cite

When tooth enamel is exposed to ionizing radiation, radicals are formed that can be detected using Electron Paramagnetic Resonance (EPR) techniques. EPR dosimetry using tooth enamel is based on the (presumed) correlation between the intensity or amplitude of some of the radiation-induced signals with the dose absorbed in the enamel. In the present paper a critical review is given of this widely applied dosimetric method.The first part of the paper is quite fundamental and deals with the main properties of tooth enamel and several of its model systems (e.g., synthetic apatites). Considerable attention is also devoted to the numerous radiation-induced and native EPR signals, and the radicals responsible for them. The relevant EPR detection, identification and spectrum analysing methods are reviewed from a general point of view. Finally, the need for solid state modelling and the linearity of the dose response are investigated.The second part is devoted to the practical implementation of EPR dosimetry using enamel. It concerns the preparation of samples, specific irradiation problems, spectrum acquisition and it is described how the dosimetric signal intensity and dose can be retrieved from the EPR spectra. Special attention is paid to the energy dependence of the EPR response and to sources of uncertainties. Results of and problems encountered in international intercomparisons and epidemiological studies are also dealt with.In the final chapter the future of EPR dosimetry with tooth enamel is analysed.

show abstract

Section: Non-uniformity Of the Microwave And Modulation Fields In Thementioning

confidence: 82%

EPR dosimetry with tooth enamel: A review

Fattibene

Callens

2010

Applied Radiation and Isotopes

212

160

View full text Add to dashboard Cite

show abstract

“…The agreement between theory and experiment is good in all cases and any deviations can be attributed to the pres-optimized values for I pp correspond to the sample center, S c (L/2), being shifted below the physical center of the ence of the sample access holes (17, 24), the compression field effect (5,19), and nonuniformity of both the micro-cavity. wave and the modulation fields (13,17,18) which were not Some of the above experiments were repeated using the included in the theoretical function. From Fig.…”

Section: Resultsmentioning

confidence: 99%

“…See, for point-like samples were prepared by making cylindrical samples with a material column length 1.3 mm and i.d. 1.3 mm example, (5,13,17,18).…”

Section: Rectangular Cavitymentioning

confidence: 98%

“…Howlengths from 5 to 20 mm; (ii) a plateau, over which the EPR signal ever, in practice, experimental analysis of the same sample intensity remained constant within experimental errors of 0.26-in different laboratories produced results which in the worst tary cavity of the double TE 104 cavity caused an additional defor-the microwave cavity. These criteria are in practice only mation of the signal intensity for a 30-mm sample which was fulfilled for a point-like sample (4,5,(13)(14)(15)(16)(17)(18)(19). However, moving in the first cavity.…”

mentioning

confidence: 99%

“…), which is filled by the liquid, or powdered material to Cylindrical samples to be compared should be of identical length produce column lengths varying from 5 to 50 mm or more. (2,5,(17)(18)(19) In quantitative EPR it is sometimes necessary to compare the unknown cylindrical sample (with a variable length) …”

mentioning

confidence: 99%

See 2 more Smart Citations