Intercomparison of National Roentgen and Gamma Ray Exposure-Dose Standards

Wyckoff, Harold O.; Allisy, A.; Aston, G. H.; Barnard, G P; Hübner, W.; Loftus, T.; Taupin, G.

doi:10.3109/02841866309135065

Cited by 5 publications

(3 citation statements)

References 9 publications

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“…Also, the calibrations agreed with earlier results between three of the four laboratories to within the expected uncertainty of 0.5 percent (Ref. 606).…”

Section: )supporting

confidence: 88%

X-Ray measurements and protection, 1913-1964

Taylor¹,

Tilley²

1981

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“…Also, the calibrations agreed with earlier results between three of the four laboratories to within the expected uncertainty of 0.5 percent (Ref. 606).…”

Section: )supporting

confidence: 88%

X-Ray measurements and protection, 1913-1964

Taylor¹,

Tilley²

1981

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“…One set of indirect comparisons using two of the three-terminal cavity chambers (transfer in¬ struments) described in the last ICRU Report (1959) has been completed. The results of these comparisons are given in table IIA4 (Wyckoff et al, 1963). The estimated maximum uncertainty of about 0.5 percent is somewhat larger than that assigned to direct comparisons, though it is con¬ sidered that it should be possible to improve such transfer instruments so that indirect comparisons are almost as accurate as direct ones.…”

Section: (Ig3)mentioning

confidence: 98%

Physical aspects of irradiation: recommendations of the International Commission on Radiological Units and Measurements (ICRU) report 10B 1962

1964

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“…The results were corrected by the normal correction procedure (Wyckoff et al 1963). The air path contribution to the total filtration after allowing for the distance of the X-ray tube window from the target (2.5 cm), the thickness of the Be window (3.0 mm) and the thickness of the monitor chamber (4.8 mm perspex) (but not for the thickness of any added filter) was 1.4872 m.…”

Section: Conclusionmentioning

confidence: 99%

A determination by an analysis of X-ray attenuation in aluminium of the intensity distribution at its point of origin in a thick tungsten target of bremsstrahlung excited by constant potentials of 60-140 kV

Soole¹

1977

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A recently described, computer aided method of attenuation analysis has been applied to free-air chamber measurements of the attenuation by up to 30mm A1 of the exposure rate of a narrow beam of X-radiation excited at a thick W target in a Be window tube by constant potentials of 60, 80, 100, 120 and 140 kV. It has been shown that the general characteristics of the intensity distributions of the bremsstahlung at its point of origin within the target found by an earlier analysis are fully confirmed but that, for radiation excited at potentials appreciably above the K-absorption edge of the tungsten target, the attenuation measurements must first be corrected for the pressure of target characteristic K-fluorescence radiation. A method for doing this from published estimates of the relative amounts of W K-fluorescence at various filtrations in radiation excited by the same potentials is described, and it is shown that these amounts come into reasonable agreement when translated to the target surface. Curves of the intensity distribution of the bremsstrahlung at its point of origin within the target are presented which are consistent with attenuation data corrected according to these estimates. They show a good general agreement with theoretical expectation.

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Intercomparison of National Roentgen and Gamma Ray Exposure-Dose Standards

Cited by 5 publications

References 9 publications

X-Ray measurements and protection, 1913-1964

X-Ray measurements and protection, 1913-1964

Physical aspects of irradiation: recommendations of the International Commission on Radiological Units and Measurements (ICRU) report 10B 1962

A determination by an analysis of X-ray attenuation in aluminium of the intensity distribution at its point of origin in a thick tungsten target of bremsstrahlung excited by constant potentials of 60-140 kV

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