Der Einflu� d�nner luft�quivalenter Zwischenschichten auf die Druckabh�ngigkeit der mittleren Ionendosisleistung

Engelke, B. A.; Oetzmann, W.

doi:10.1007/bf01189268

Cited by 2 publications

(1 citation statement)

References 6 publications

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“…Their wall thicknesses are different from that of the NBS 1 cm3 chamber and they are used to determine the correction for wall effect. The PTB chambers [5] are cylindrical; two of them are thimble-type chambers; they are named (a) and (b) in this paper. The third chamber (c) is a pillbox type chamber quite similar to the BIPM standard except for the thickness of the collecting plate (0.05 cm instead of 0.1 cm).…”

Section: Standard Chambersmentioning

confidence: 99%

Comparison of Exposure Standards for⁶⁰Co Gamma Rays

1975

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Comparisons forgamma rays between the exposure standards of the Bureau International des Poids et Mesures (BIPM), the National Bureau of Standards (NBS) and the Physikalisch-Technische Bundesanstalt (PTB) are reported. For measuremente made at about one meter from the source, and if the same physical constants are used, the differences are 0.26% between the BIPM and NBS standards, and a t most 0.4% between the BIPM standard and the PTB standard chambers. The differences are consistent with the estimated systematic uncertainties (= 0.5 %).The difference between the NBS standard and the PTB chamber measurements, as determined through the ratios of each to the BIPM chamber, ranges from 0.17 to 0.66%. The difference in exposure standards for NBS and PTB actually ranges from 0.48 to 0.97%, since different stopping power corrections are used by these two laboratories.An indirect comparison of the BIPM and NBS standards indicates that the difference of 0.26% will increase to 0.55% a t a distance of two meters. RBsumBOn relate des comparaisons entre Btalons de mesure de l'exposition dans un faisceau de rayons gamma du 6OCo: ceux du Bureau International des Poids et Mesures (BIPM), du National Bureau of Standards (NBS) et de la Physikalisch-Technische Bundesanstalt (PTB). Pour les mesures effectuBes B un metre environ de la source et si Yon utilise les m6mes constantes physiques, les Bcarta sont 0,26y0 entre les &talons du BIPM et du NBS, et au plus 0,4 % entre 1'Btalon du BIPM et les chambres Btalons de la PTB. Ces diffhrences sont compatibles avec les incertitudes systBmatiques estimbes (= 0,5 %).Les diffbrences entre les mesures de 1'6talon du NBS et des chambres de la PTB, telles qu'on peut les dBduire de leurs rapports respectifs la chambre du BIPM, sont comprises entre 0,17 et 0,66%. Les d8Brences entre lea Btalons #exposition du NBS et de la PTB sont en rBalit6 comprises entre 0,48 et 0,97 % puisque ces deux laboratoires utilisent des corrections de pouvoir de ralentissement d8Brentes.Une comparaison indirecte des Btalons du BIPM et du NBS montre que la diffkrence 0,26% deviendrait 0,55% B unc distance de deux mhtres.

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Section: Standard Chambersmentioning

confidence: 99%

Comparison of Exposure Standards for⁶⁰Co Gamma Rays

1975

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Calibration of cavity ionization chambers

Franz¹

1971

pmb

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d commercial thimble ionization chamber, intended for use as a Bragg-Gray cavity chamber a t high photon energies, must be calibrated in such a way that the reading of the instrument can be converted into the " ion dose " in the air volume of the chamber. i.e. the quotient of the ion charge and the mass of air in that volume.The factor for this conversion is independent of the photon energy. A method for this calibration is proposed and measurements of a correction factor are described. The theoretical expression for the energy dependent conversion factor, in calculating the absorbed dose in water from the reading of the dosemeter when the chamber is used in a water phantom, is compared with calculations of other authors.

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Der Einflu� d�nner luft�quivalenter Zwischenschichten auf die Druckabh�ngigkeit der mittleren Ionendosisleistung

Cited by 2 publications

References 6 publications

Comparison of Exposure Standards for⁶⁰Co Gamma Rays

Comparison of Exposure Standards for⁶⁰Co Gamma Rays

Calibration of cavity ionization chambers

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Der Einflu� d�nner luft�quivalenter Zwischenschichten auf die Druckabh�ngigkeit der mittleren Ionendosisleistung

Cited by 2 publications

References 6 publications

Comparison of Exposure Standards for60Co Gamma Rays

Comparison of Exposure Standards for60Co Gamma Rays

Calibration of cavity ionization chambers

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Comparison of Exposure Standards for⁶⁰Co Gamma Rays

Comparison of Exposure Standards for⁶⁰Co Gamma Rays