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Comparison of Exposure Standards in the 10–50 kV X-Ray Region

Autor: P J Lamperti, M Boutillon, W H Henry

Publikováno v: Metrologia. 5:1-11

Direct comparisons of the low-energy X-ray exposure standards of the Bureau International des Poids et Mesures (BIPM) and the National Research Council of Canada (NRC), and also of the BIPM and the National Bureau of Standards of the USA (NBS), were

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::df1e9c2cfbd7a993cf1277dc96ee0105
https://doi.org/10.1088/0026-1394/5/1/002

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Tissue-air ratio, peak scatter factor and consistency

Autor: W. H. Henry

Publikováno v: Physics in Medicine and Biology. 19:43-50

Attention is drawn to the contribution from scattered photons to the reference quality for tissue-air ratio. Consistency between tissue-air ratio and peak scatter factor is discussed. The magnitude of possible discrepancies is estimated. Means by whi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::58a571bea96561922128aef073a7bbf3
https://doi.org/10.1088/0031-9155/19/1/004

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Monitoring Ionization Chamber for an X-ray Generator

Autor: J H Aitken, W H Henry

Publikováno v: The British Journal of Radiology. 34:516-520

The construction and operation of a monitoring ionization chamber are described. By its use, the delivery of successive X-ray exposure doses, normalised to the reading of the monitoring chamber, can be accomplished with a precision of better than 0·

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fd6adffe9601c1a118bfc6e5efb0cb57
https://doi.org/10.1259/0007-1285-34-404-516

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PULSER FOR CYCLOTRON OSCILLATOR

Autor: W. H. Henry, J. D. Keys

Publikováno v: Canadian Journal of Physics. 29:137-141

A pulser for the R.F. oscillator of the McGill synchrocyclotron is described. This pulser is triggered at a selected precise frequency and controls the oscillator for selected pulses or for predetermined exact periods of continuous operation.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e41132855508adfb6b566c074ba6b713
https://doi.org/10.1139/p51-016

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Comparison of United States and Canadian Free-air Ionization Chambers

Autor: W. H. Henry, T. P. Loftus, L. De la Vergne, J. H. Aitken

Publikováno v: The British Journal of Radiology. 35:65-70

The Canadian and U.S. standard free-air ionization chambers have been compared under identical conditions of X-ray tube kilovoltage and filtration. The comparison shows that the ratio of exposure dose-rate measurements differs from unity by about 0·

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ee8650a03abdfca9b2948172c6443303
https://doi.org/10.1259/0007-1285-35-409-65

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On CE, Clambda , and the effective wall material of a Baldwin-Farmer chamber

Autor: W H Henry

An expression relating the constant A to the characteristics of an ionisation chamber is developed. This constant, used to obtain the mass ionisation from the instrument reading, appears in expressions for Ce and Clambda, and is a function of the cha

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1caadc154ce298cbf0d4a65ed5734596
https://nrc-publications.canada.ca/eng/view/object/?id=88cac42b-5a2a-4711-9837-36ab4a9d3a5d

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