Cavity-Chamber Theory

Burlin, T. E.

doi:10.1016/b978-0-12-066401-6.50015-4

Cited by 35 publications

(19 citation statements)

References 71 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…More recently Burlin and Simmonds (1976) have made an approach to photon dosimetry in bone cavities by way of an extension of Burlin's theory of cavity ionisation (Burlin, 1966). Another model of trabecular structure has been used by Snyder et al (1969), in which a region of trabecular bone is regarded as a composite mixture of bone and marrow.…”

mentioning

confidence: 97%

Photoelectron Enhancement of the Absorbed Dose from X Rays to Human Bone Marrow: Experimental and Theoretical Studies

King¹,

Spiers²

1985

BJR

View full text Add to dashboard Cite

A technique is described by which lithium fluoride powder is introduced into the marrow cavities in specimens of human trabecular bone to determine the excess photoelectron dose to marrow, when bone is irradiated by X rays of energies between 20 keV and 140 keV. Three specimens of trabecular bone, containing respectively 10, 15 and 25% bone by volume, were investigated and the results compared with those derived on the basis of earlier calculations for mono-energetic electrons by Whitwell. Reasonable agreement was found between the experimental and theoretical results, although there was some indication that scatter influenced the practical measurements at the higher photon energies. Theoretical calculations are then used to derive photoelectron dose enhancements for complete bones from the measured results on the bone specimens, and mean enhancements of the marrow dose for the whole human skeleton are calculated for subjects aged 44, 9 and 1.7 years.

show abstract

mentioning

confidence: 97%

Photoelectron Enhancement of the Absorbed Dose from X Rays to Human Bone Marrow: Experimental and Theoretical Studies

King¹,

Spiers²

1985

BJR

View full text Add to dashboard Cite

show abstract

“…1 The OSLD assessed in our study exhibited no significant difference in responses with or without the PMMA cover. This finding suggests that the secondary electrons emerging from the PMMA cylinder scarcely affect the OSL emission and that cavity theory 7 can therefore be applied in the OSL dosimetry of diagnostic X-rays. We can therefore conclude that they can be covered by PMMA in order to stabilize and protect them without affecting their dosimetric performance.…”

Section: Discussionmentioning

confidence: 79%

“…7 When we consider an organ dose, we assume that the cavity is filled with the organ. When the radiation dose in the phantom is measured, the cavity is filled with the detector material.…”

Section: Calibration Of Osldmentioning

confidence: 99%

Characterization of optically stimulated luminescence dosemeters to measure organ doses in diagnostic radiology

Endo

Katoh²,

Kobayashi³

et al. 2012

Dentomaxillofacial Radiology

View full text Add to dashboard Cite

Objective: The aim of this study was to assess the characteristics of an optically stimulated luminescence dosemeter (OSLD) for use in diagnostic radiology and to apply the OSLD in measuring the organ doses by panoramic radiography. Methods: The dose linearity, energy dependency and angular dependency of aluminium oxide-based OSLDs were examined using an X-ray generator to simulate various exposure settings in diagnostic radiology. The organ doses were then measured by inserting the dosemeters into an anthropomorphic phantom while using three panoramic machines. Results: The dosemeters demonstrated consistent dose linearity (coefficient of variation , 1.5%) and no significant energy dependency (coefficient of variation , 1.5%) under the applied exposure conditions. They also exhibited negligible angular dependency (# 10%). The organ doses of the X-ray as a result of panoramic imaging by three machines were calculated using the dosemeters. Conclusion: OSLDs can be utilized to measure the organ doses in diagnostic radiology. The availability of these dosemeters in strip form proves to be reliably advantageous.

show abstract

“…La dose absorbée dans l'eau Z) wF au moyen du dosimètre de Fricke est exprimée par (Chang-Ming et al, 1993 ;Burlin, 1966 ;Fricke et Hart, 1966) :…”

Section: Dosimétrie Chimiqueunclassified

“…l + 0,0012(i-25 °C) V> p est la densité volumique de la solution ferreuse, exprimée en kg m -3 ; / est le facteur de conversion de la dose absorbée dans la solution de Fricke en dose absorbée dans l'eau (D w p) ; dans le cas des faisceaux de photons de 6u Co, ce facteur est exprimé par le rapport des coefficients d'atténuation massiques en énergie de la solution ferreuse et de l'eau (Burlin, 1966) ; P wa n est le facteur de correction dû à l'effet de la paroi ;…”

Section: Dosimétrie Chimiqueunclassified

Contribution au développement d'un dosimètre de transfert pour les fortes doses, caractérisé au moyen d'un étalon secondaire

1996

View full text Add to dashboard Cite

RÉSUMÉABSTRACT The metrological parameters of a ferrous sulphate dosemeter are normally determined by comparison with primary standards. We have undertaken to evaluate these parameters using a secondary standard and the IAEA formalism for absorbed dose determination. Thus, we have determined with measurements the wavelength of absorption of the ferric ion (304 nm), the molar extinction coefficient e (218.7 ± 0.9) mol 1 m 2 and the radiochemical yield G (1.627 ± 0.04) 1(H> mol J" 1 . These values of c and G are respectively within 0.4% and 0.6% of the reference values recommended by the ICRU. The comparison of absorbed dose values derived from the ferrous sulphate dosemeter and the ion chamber has allowed to determine the detection limit of the Fricke dosemeter, which is around 20 Gy. Beyond this limit, the dosimeter as developed at the SSDL allows the determination of absorbed dose in water with a global uncertainty of ± 1.2%. For the countries who do not have primary standards, it is possible to undertake the control of doses used in radiation sterilisation using this type of dosemeter prepared and calibrated in a SSDL.

show abstract

Cavity-Chamber Theory

Cited by 35 publications

References 71 publications

Photoelectron Enhancement of the Absorbed Dose from X Rays to Human Bone Marrow: Experimental and Theoretical Studies

Photoelectron Enhancement of the Absorbed Dose from X Rays to Human Bone Marrow: Experimental and Theoretical Studies

Characterization of optically stimulated luminescence dosemeters to measure organ doses in diagnostic radiology

Contribution au développement d'un dosimètre de transfert pour les fortes doses, caractérisé au moyen d'un étalon secondaire

Contact Info

Product

Resources

About