Response of the Hanford Combination Neutron Dosimeter in plutonium environments

Endres, A.; Brackenbush, L.W.; Baumgartner, W.V.

doi:10.2172/211349

Cited by 9 publications

(24 citation statements)

References 1 publication

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“…These irradiations were performed in the Hanford Calibration Laboratory. A plutonium algorithm was developed from dosimeter irradiations at the PFP using plutonium sources (Endres et al 1996).…”

Section: Dosimeter Calibration Sources and Calibration Factorsmentioning

confidence: 99%

“…In the 1995 study of Hanford dosimeter responses in the workplace (Endres et al 1996), Section 6.1 describes the use of this type of sphere measurement in neutron fields. This study found that 8 in.-to-3 in.…”

Section: Sphere Measurementsmentioning

confidence: 99%

“…Detailed dosimeter specifications are given in PNL-MA-842. The development of the dosimeter design is described by Brackenbush, Baumgartner, and Fix (1991) and Endres et al (1996). A HCND plastic holder is used to contain all three of these dosimeters, along with the Hanford personnel nuclear accident dosimeter (PNAD).…”

Section: Hanford Combination Neutron Dosimetermentioning

confidence: 99%

“…The neutron spectra and neutron dose equivalent rates were determined by multisphere and TEPC measurements of the source. The algorithm is presented in Figure 3.4 and its development is described in detail by Endres et al (1996).…”

Section: Hcnd Neutron Dose Algorithmmentioning

confidence: 99%

“…The plutonium algorithm as described by Endres et al (1996) was developed based on measurements made at the PFP with a PuF 4 source and various thicknesses of acrylic plastic between the source and dosimeters. Dosimeters were mounted on an acrylic plastic phantom, 40 by 40 by 15 cm (15.75 by 15.75 by 6 in.).…”

Section: Plutonium Algorithm (Case 1)mentioning

confidence: 99%

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Validation of Hanford Personnel and Extremity Dosimeters in Plutonium Environments

Scherpelz¹,

Fix²,

Rathbone³

2000

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A study was performed to assess the performance of Hanford personnel neutron dosimetry. Measurements were performed in the Plutonium Finishing Plant (PFP), which is the facility with the most significant worker exposures to neutrons on the Hanford site. The study was conducted in two parts: one assessing whole body dosimetry and one assessing extremity dosimetry. For both parts of the study, the Tissue-Equivalent Proportional Counter (TEPC) was used as the principle instrument for characterizing workplace neutron fields.In the whole body study, 12.7-cm-diameter TEPCs were used in ten different locations in the facility. At each location, TLD and TED personnel dosimeters were exposed on a water-filled phantom at the same location to enable a comparison of neutron dose equivalents as measured by the TEPC and as determined from the personnel dosimeters.In the extremity study, 1.27-cm-diameter TEPCs were exposed inside the fingers of gloves worn in gloveboxes. Hanford extremity dosimeters (gamma sensitive ring TLDs) were wrapped around the TEPCs. The glove, loaded with TEPCs and dosimeters, was exposed to six different cans of plutonium, simulating the exposure that a worker's fingers would receive in a glovebox. The comparison of TEPC-measured neutron dose equivalent to TLD-measured gamma dose equivalent provided neutron-to-gamma ratios that can be used to estimate the neutron dose equivalent received by a worker's finger based on the gamma readings of an extremity dosimeter.The study also utilized other neutron instruments including a Snoopy and detectors based on bubble technology for assessing neutron exposures, providing a comparison of the effectiveness of these instruments for workplace monitoring.The study concludes that the TLD component of the Hanford Combination Neutron Dosimeter (HCND) performs adequately overall, with a positive bias of 30%, but exhibits excessive variability in individual results due to instabilities in the algorithm. The electrochemically etched TED response was less variable but only 20% of the TEPC reference dose on average because of the low neutron energies involved. The neutron response of the Hanford Standard Dosimeter (TLD) was more variable than the TLD component of the HCND and biased high by a factor of 8 overall due to its calibration to unmoderated 252 Cf. The study recommends further work to correct instabilities in the HCND algorithm and to explore the potential shown by the bubble-based dosimeters.iii EXECUTIVE SUMMARYThis report describes measurements performed in the Plutonium Finishing Plant (PFP) work environment to validate the recorded neutron dose for Hanford workers. The responses of Hanford dosimeter components, including the Hanford standard dosimeter (HSD), and both the thermoluminescent dosimeter (TLD) and track-etch dosimeter (TED) components of the Hanford combination neutron dosimeter (HCND) have been well characterized under the low-scatter conditions of the Hanford 318 Radiation Standards Laboratory. Hanford whole body personnel dosimeter respon...

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Section: Dosimeter Calibration Sources and Calibration Factorsmentioning

confidence: 99%

Section: Sphere Measurementsmentioning

confidence: 99%

Section: Hanford Combination Neutron Dosimetermentioning

confidence: 99%

Section: Hcnd Neutron Dose Algorithmmentioning

confidence: 99%

Section: Plutonium Algorithm (Case 1)mentioning

confidence: 99%

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Validation of Hanford Personnel and Extremity Dosimeters in Plutonium Environments

Scherpelz¹,

Fix²,

Rathbone³

2000

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Construction of a self-supporting tissue-equivalent dividing wall and operational characteristics of a coaxial double-cylindrical tissue-equivalent proportional counter

Saion

Watt

1994

Meas. Sci. Technol.

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An additional feature incorporated in a coaxial double-cylindrical tissueequivalent proportional counter is the presence of a common tissue-equivalent dividing wall between the inner and outer counters of thickness equivalent to the corresponding maximum range of protons at the energy of interest. By appropriate use of an anticoincidence arrangement with the outer counter, the inner counter could be used to discriminate microdosimetric spectra of neutrons at the desired low energy range from those of the faster neutrons. The construction of an A-150 self-supporting tissueequivalent dividing wall and an anti-coincidence unit are described. Some operational characteristic tests have been performed to determine the operation of the new microdosimeter.

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Development of a neutron personal dose equivalent detector

Tsujimura

Yoshida

Takada

et al. 2007

Radiation Protection Dosimetry

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A new neutron-measuring instrument that is intended to measure a neutron personal dose equivalent, H(p)(10) was developed. This instrument is composed of two parts: (1) a conventional moderator-based neutron dose equivalent meter and (2) a neutron shield made of borated polyethylene, which covers a backward hemisphere to adjust the angular dependence. The whole design was determined on the basis of MCNP calculations so as to have response characteristics that would generally match both the energy and angular dependencies of H(p)(10). This new instrument will be a great help in assessing the reference values of neutron H(p)(10) during field testing of personal neutron dosemeters in workplaces and also in interpreting their readings.

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Response of the Hanford Combination Neutron Dosimeter in plutonium environments

Cited by 9 publications

References 1 publication

Validation of Hanford Personnel and Extremity Dosimeters in Plutonium Environments

Validation of Hanford Personnel and Extremity Dosimeters in Plutonium Environments

Construction of a self-supporting tissue-equivalent dividing wall and operational characteristics of a coaxial double-cylindrical tissue-equivalent proportional counter

Development of a neutron personal dose equivalent detector

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