A comparison of absorbed dose determinations in graphite by cavity ionization measurements and by calorimetry

Petree, B.; Lamperti, P.

doi:10.6028/jres.071c.004

Cited by 14 publications

(21 citation statements)

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“…The volume of uniform absorbed dose rate is about 4 cm in diameter by 4 cm high, centered at 6.5 cm above the inside bottom of the can on the central axis. The absorbed dose rate of this source has been previously determined by an adiabatic graphite spherical calorimeter and a graphite ionization chamber of identical dimensions to an overall uncertainty estimated to be about +0.4% at a 99% confidence level [3]. Periodic verification checks of the absorbed dose rate is done annually by means of reference transfer dosimeters in collaboration with the National Physical Laboratory (NPL) of the U.K.…”

Section: For 6mentioning

confidence: 99%

“…The absorbed dose rate in water in May 1986 was 0.076 kGymin" 1 . A complete discussion is given in reference [3] of the sources of the uncertainties in the absorbed dose rate of this 60 Co facility.…”

Section: For 6mentioning

confidence: 99%

“…The calorimeter/ion chamber measurements of the pool source absorbed dose rate were analyzed in reference [3] for all possible sources of error contributions such as core mass, electrical power, attenuation, and heating rate for the calorimeter, and air mass, current measurement, and collection efficiency for the ion chamber. All factors were combined in quadrature (square root of the sum of the squares) to give an overall value of 0.43% at a 99% confidence level.…”

Section: 2mentioning

confidence: 99%

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Dosimetry for high dose applications

Humphreys¹,

Hocken²,

McLaughlin³

1988

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The calibration and related measurement services of the National Bureau of Standards are intended to assist the makers and users of precision measuring instruments in achieving the highest possible levels of accuracy, quality, and productivity. NBS offers over 300 different calibration, special test, and measurement assurance services. These services allow customers to directly link their measurement systems to measurement systems and standards maintained by MBS. These services are offered to the public and private organizations alike. They are described in NBS Special Publication (SP) 250, NBS Calibration Services Users Guide. The Users Guide is being supplemented by a number of special publications (designated as the "SP 250 Series") that provide a detailed description of the important features of specific NBS calibration services. These documents provide a description of the: (1) specifications for the service; (2) design philosophy and theory; (3) NBS measurement system; (4) NBS operational procedures; (5) assessment of measurement uncertainty including random and systematic errors and an error budget; and (6) internal quality control procedures used by NBS. These documents will present more detail than can be given in an NBS calibration report, or than is generally allowed in articles in scientific journals. In the past NBS has published such information in a variety of ways. This series will help make this type of information more readily available to the user.

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Section: For 6mentioning

confidence: 99%

Section: For 6mentioning

confidence: 99%

Section: 2mentioning

confidence: 99%

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Dosimetry for high dose applications

Humphreys¹,

Hocken²,

McLaughlin³

1988

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“…17. KEY WORDS (six to twelve entries; alphabetical order; capitalize only the first letter of the first key word unless a proper name; separated by semicolons) Aluminum; carbon; depth dose; depth-dose distributions; dye-film dosimeters; polyethylene; polystyrene; radiochromic dyes; 10-MeV electrons 18. AVAILABILITY Unlimited 19.…”

Section: Suggestions For Future Experimentsmentioning

confidence: 99%

Measurement of depth-dose distributions in carbon, aluminum, polyethylene, and polystyrene for 10-MEV incident electrons

Humphreys¹,

Chappell²,

McLaughlin³

et al. 1973

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Depth-dose distributions of 10-MeV electrons incident on homogeneous media of carbon, aluminum, polyethylene, and polystyrene have been measured using thin radiochromic dye-film dosimeters. Two types of dye-film dosimeters were employed as "cavities" within the media in two different geometrical configurations. One configuration was a stack with the dosimeters interleaved between disks of the medium and placed perpendicular to the incident electron beam direction. The other configuration was a wedge assembly with a single piece of dye film placed between pieces of the medium at a small angle to the beam direction. • The results show no significant difference between dosimeter type or experimental arrangement. In addition, good agreement is shown in comparisons of experimental and Monte Carlo calculated depth-dose distributions characterized by such parameters as extrapolated range, depth of peak dose, and ratio of peak to entrance dose.

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“…The systematic errors produced by gradients that are not negligible have been discussed, [1 , 2] 1 and upper limits for these errors have been assigned in some simple cases [3]. Experimental means are also available for detecting and evaluating the gradient-induced errors [4]. A calorimeter design is reported here which is intended essentially to eliminate systematic errors caused by temperature gradients.…”

Section: Introductionmentioning

confidence: 99%