Determination of the secondary electron equilibrium using an extrapolation chamber

Marshall, E T; Vaziri, K; Krueger, F P; Cossairt, J D

Title: Determination of the secondary electron equilibrium using an extrapolation chamber

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Abstract

To ensure that the external personnel dosimetry program conducted by U. S. Department of Energy (DOE) contractors is of the highest quality, the DOE established the Department of Energy Laboratory Accreditation Program or DOELAP. The contractor`s dosimetry program is assessed against the criteria set forth for dosimeter performance and the associated quality assurance and calibration programs. Although personnel dosimeters are not processed or calibrated by Fermilab, a proactive quality assurance program is in place to ensure accurate monitoring. This program includes quarterly blind testing of the dosimeters used by personnel. During the on-site assessment conducted of Fermilab`s external dosimetry program during May 1994, an observation with regard to equipment maintenance and calibration was made: ``calibration personnel should probably review the electron secondary equilibrium needs at various irradiation distances from the {sup 137}Cs irradiation systems`` The majority of the secondary electrons are generated through interactions of the beam with the collimator. Secondary electrons increase the low energy component of the radiation field, increasing the shallow doses measured. For dosimetric purposes, this increase needs to be defined so appropriate corrections to calculations or modifications to the facility can be made. Prompted by this observation, a study was designed to investigate the electronmore »« less

Authors:: Marshall, E T; Vaziri, K; Krueger, F P; Cossairt, J D

Publication Date:: Sun Sep 01 00:00:00 EDT 1996

Research Org.:: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

Sponsoring Org.:: USDOE Office of Energy Research, Washington, DC (United States)

OSTI Identifier:: 412176

Report Number(s):: FNAL/C-96/318; CONF-970134-1
ON: DE96050562; TRN: 97:001152

DOE Contract Number:: AC02-76CH03000

Resource Type:: Conference

Resource Relation:: Conference: 30. midyear topical meeting of the Health Physics Society, San Jose, CA (United States), 5-8 Jan 1997; Other Information: PBD: Sep 1996

Country of Publication:: United States

Language:: English

Subject:: 56 BIOLOGY AND MEDICINE, APPLIED STUDIES; PERSONNEL DOSIMETRY; CALIBRATION; SECONDARY EMISSION; EQUILIBRIUM; EXTRAPOLATION CHAMBERS; DOSE EQUIVALENTS; QUALITY ASSURANCE; RADIATION PROTECTION; EXTERNAL IRRADIATION; TISSUE-EQUIVALENT DETECTORS; GAMMA RADIATION; CONCRETES; DOSE RATES; RADIATION DETECTION

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                    Marshall, E T, Vaziri, K, Krueger, F P, and Cossairt, J D. Determination of the secondary electron equilibrium using an extrapolation chamber.  United States: N. p., 1996. 
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                    Marshall, E T, Vaziri, K, Krueger, F P, & Cossairt, J D. Determination of the secondary electron equilibrium using an extrapolation chamber.  United States.

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                    Marshall, E T, Vaziri, K, Krueger, F P, and Cossairt, J D. 1996.  
        "Determination of the secondary electron equilibrium using an extrapolation chamber".  United States.  https://www.osti.gov/servlets/purl/412176.

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@article{osti_412176,

  title        = {Determination of the secondary electron equilibrium using an extrapolation chamber},

  author       = {Marshall, E T and Vaziri, K and Krueger, F P and Cossairt, J D},

  abstractNote = {To ensure that the external personnel dosimetry program conducted by U. S. Department of Energy (DOE) contractors is of the highest quality, the DOE established the Department of Energy Laboratory Accreditation Program or DOELAP. The contractor`s dosimetry program is assessed against the criteria set forth for dosimeter performance and the associated quality assurance and calibration programs. Although personnel dosimeters are not processed or calibrated by Fermilab, a proactive quality assurance program is in place to ensure accurate monitoring. This program includes quarterly blind testing of the dosimeters used by personnel. During the on-site assessment conducted of Fermilab`s external dosimetry program during May 1994, an observation with regard to equipment maintenance and calibration was made: ``calibration personnel should probably review the electron secondary equilibrium needs at various irradiation distances from the {sup 137}Cs irradiation systems`` The majority of the secondary electrons are generated through interactions of the beam with the collimator. Secondary electrons increase the low energy component of the radiation field, increasing the shallow doses measured. For dosimetric purposes, this increase needs to be defined so appropriate corrections to calculations or modifications to the facility can be made. Prompted by this observation, a study was designed to investigate the electron secondary equilibrium in the facility used for the blind testing by determining the dose equivalent as a function of depth in a tissue-equivalent medium. This presentation summarizes the methodology utilized and results of the investigation.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/412176},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {Sun Sep 01 00:00:00 EDT 1996},

  month        = {Sun Sep 01 00:00:00 EDT 1996}

}

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