Radiation processing dosimetry calibration services and measurement assurance program

Humphreys, J.C.; Puhl, James M.; Seltzer, S. M.; McLaughlin, W.L.; Desrosiers, Marc F.; Bensen, Debra L; Walker, Mitchell L. R.

doi:10.6028/nist.sp.250-44

Cited by 7 publications

(7 citation statements)

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“…The water surface is set at a scale distance of 53.8 cm. This design differs from the published scheme [ 3 ]. In the published scheme, this irradiation was done in a polystyrene phantom and a scaling theorem was used to correct for differences in photon interaction cross sections between polystyrene and water.…”

Section: Calibration Of Nist Gamma Sourcesmentioning

confidence: 98%

“…At NIST, absorbed dose is realized by a water calorimeter in a gamma-ray field produced by a Vertical Beam 60 Co source [ 2 ] with an activity (as of April, 2007) of 48 TBq (1.3 kCi). The technical specifications for this source were described previously [ 3 ]. Because the dose rate for this source is relatively low, a high-dose-rate source is needed to perform customer calibrations.…”

Section: Calibration Of Nist Gamma Sourcesmentioning

confidence: 99%

“…2.1 are used for NIST high-dose calibration services. Prior to 2004, the Pool source and the Gammacells were each calibrated by a direct dosimeter response ratio to the Vertical Beam 60 Co source [ 3 ]. However, the Vertical Beam 60 Co source dose rate has decayed to a level that requires excessive periods of time (>24 h) to perform comparisons at the absorbed doses (≥1 kGy) routinely used.…”

Section: Calibration Of Nist Gamma Sourcesmentioning

confidence: 99%

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An absorbed-dose/dose-rate dependence for the alanine-EPR dosimetry system and its implications in high-dose ionizing radiation metrology

Mf¹,

Jm²,

Sl³

2008

J. Res. Natl. Inst. Stand. Technol.

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NIST developed the alanine dosimetry system in the early 1990s to replace radiochromic dye film dosimeters. Later in the decade the alanine system was firmly established as a transfer service for high-dose radiation dosimetry and an integral part of the internal calibration scheme supporting these services. Over the course of the last decade, routine monitoring of the system revealed a small but significant observation that, after examination, led to the characterization of a previously unknown absorbed-dose-dependent, dose-rate effect for the alanine system. Though the potential impact of this effect is anticipated to be extremely limited for NIST’s customer-based transfer dosimetry service, much greater implications may be realized for international measurement comparisons between National Measurement Institutes.

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Section: Calibration Of Nist Gamma Sourcesmentioning

confidence: 98%

Section: Calibration Of Nist Gamma Sourcesmentioning

confidence: 99%

Section: Calibration Of Nist Gamma Sourcesmentioning

confidence: 99%

See 1 more Smart Citation

An absorbed-dose/dose-rate dependence for the alanine-EPR dosimetry system and its implications in high-dose ionizing radiation metrology

Mf¹,

Jm²,

Sl³

2008

J. Res. Natl. Inst. Stand. Technol.

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“…The calibration scheme for determining the dose rate has recently been detailed [ 8 ]. Irradiation geometries have been published previously [ 11 ].…”

Section: Methodsmentioning

confidence: 99%

Optical Passive Sensor Calibration for Satellite Remote Sensing and the Legacy of NOAA and NIST Cooperation

Desrosiers¹

2014

J. RES. NATL. INST. STAN.

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Post-irradiation stability of high-dose dosimeters has traditionally been an important measurement influence quantity. Though the exceptional stability of the alanine dosimeter response with time has rendered this factor a non-issue for routine work, the archival quality of the alanine dosimeter has not been characterized. Here the alanine pellet dosimeter response is measured up to seven years post-irradiation for a range of absorbed doses. This long-term study is accompanied by an examination of the environmental influence quantities (e.g., ambient light) on the relatively short-term (3–4 month) stability of both pellet and film commercial dosimeters. Both dosimeter types demonstrated exceptional stability in the short term and proved to be relatively insensitive to common influence quantities. The long-term data revealed a complex dose-dependent response trend.

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“…In addition, the BIPM, although it does not offer a high-dose service, took part at a lower dose level (1 kGy) to provide a direct link to the international reference for absorbed dose to water in 60 Co. To render the comparison more robust, two transfer dosimeters were selected for the comparison; the alanine/ESR dosimetry system of the NIST (Humphries et al, 1998) and that of the NPL (Sharpe and Sephton, 2000) (the previous CCRI comparison was conducted using the IAEA alanine as the transfer dosimeter).…”

Section: Introductionmentioning

confidence: 99%

CCRI supplementary comparison of standards for absorbed dose to water in 60Co gamma radiation at radiation processing dose levels

Burns

Allisy-Roberts

Desrosiers

et al. 2006

Radiation Physics and Chemistry

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Radiation processing dosimetry calibration services and measurement assurance program

Cited by 7 publications

References 0 publications

An absorbed-dose/dose-rate dependence for the alanine-EPR dosimetry system and its implications in high-dose ionizing radiation metrology

An absorbed-dose/dose-rate dependence for the alanine-EPR dosimetry system and its implications in high-dose ionizing radiation metrology

Optical Passive Sensor Calibration for Satellite Remote Sensing and the Legacy of NOAA and NIST Cooperation

CCRI supplementary comparison of standards for absorbed dose to water in 60Co gamma radiation at radiation processing dose levels

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