Electrical mobility and size distribution of aged 212Pb nanometer carriers in nitrogen gas

Chen, Tou-Rong; Cheng, Yung‐Sung; Hopke, P.K.; Tung, Chuan–Jong; Pourprix, M.

doi:10.1016/s0021-8502(97)00035-9

Cited by 4 publications

(2 citation statements)

References 33 publications

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“…A unimodal lognormal distribution with AMTD of 1.0 nm with σ g of 1.3 is assumed for all exposure scenarios. This is in agreement with what is measured for indoor and mining environments, where the unattached 212 Pb was found to have particle sizes of approximately 1 nm (Chen et al., 1997). Measurements carried out in a radon test chamber, as part of an intercomparison exercise, also showed median diameters less than 1 nm for unattached 212 Pb (Cheng et al., 2000).…”

Section: Annex a Aerosol Data And Dose Coefficients For Radon Progenysupporting

confidence: 91%

ICRP Publication 137: Occupational Intakes of Radionuclides: Part 3

Paquet¹,

Bailey²,

Leggett³

et al. 2017

Ann ICRP

215

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The 2007 Recommendations of the International Commission on Radiological Protection (ICRP, 2007) introduced changes that affect the calculation of effective dose, and implied a revision of the dose coefficients for internal exposure, published previously in the Publication 30 series (ICRP, 1979, 1980, 1981, 1988) and Publication 68 (ICRP, 1994). In addition, new data are now available that support an update of the radionuclide-specific information given in Publications 54 and 78 (ICRP, 1988a, 1997b) for the design of monitoring programmes and retrospective assessment of occupational internal doses. Provision of new biokinetic models, dose coefficients, monitoring methods, and bioassay data was performed by Committee 2, Task Group 21 on Internal Dosimetry, and Task Group 4 on Dose Calculations. A new series, the Occupational Intakes of Radionuclides (OIR) series, will replace the Publication 30 series and Publications 54, 68, and 78. OIR Part 1 has been issued (ICRP, 2015), and describes the assessment of internal occupational exposure to radionuclides, biokinetic and dosimetric models, methods of individual and workplace monitoring, and general aspects of retrospective dose assessment. OIR Part 2 (ICRP, 2016), this current publication and upcoming publications in the OIR series (Parts 4 and 5) provide data on individual elements and their radioisotopes, including information on chemical forms encountered in the workplace; a list of principal radioisotopes and their physical half-lives and decay modes; the parameter values of the reference biokinetic model; and data on monitoring techniques for the radioisotopes encountered most commonly in workplaces. Reviews of data on inhalation, ingestion, and systemic biokinetics are also provided for most of the elements. Dosimetric data provided in the printed publications of the OIR series include tables of committed effective dose per intake (Sv Bq−1 intake) for inhalation and ingestion, tables of committed effective dose per content (Sv Bq−1 measurement) for inhalation, and graphs of retention and excretion data per Bq intake for inhalation. These data are provided for all absorption types and for the most common isotope(s) of each element. The electronic annex that accompanies the OIR series of publications contains a comprehensive set of committed effective and equivalent dose coefficients, committed effective dose per content functions, and reference bioassay functions. Data are provided for inhalation, ingestion, and direct input to blood. This third publication in the series provides the above data for the following elements: ruthenium (Ru), antimony (Sb), tellurium (Te), iodine (I), caesium (Cs), barium (Ba), iridium (Ir), lead (Pb), bismuth (Bi), polonium (Po), radon (Rn), radium (Ra), thorium (Th), and uranium (U).

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Section: Annex a Aerosol Data And Dose Coefficients For Radon Progenysupporting

confidence: 91%

ICRP Publication 137: Occupational Intakes of Radionuclides: Part 3

Paquet¹,

Bailey²,

Leggett³

et al. 2017

Ann ICRP

215

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“…Thus, the mean lifetime of unattached thoron decay products until attachment is longer than that of unattached radon decay products. Chen et al. (1997) observed a growth of clusters of unattached 212 Pb during their aging; older clusters of unattached decay products are larger and thus feature a smaller diffusion velocity than younger clusters.…”

mentioning

confidence: 94%

Thoron in indoor air: modeling for a better exposure estimate

Meisenberg

Tschiersch

2010

Indoor Air

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The radioactive noble gas radon with its decay products is well known as a health risk. After increased concentrations of the isotope (220)Rn (thoron) have been found in traditional Chinese mud-walled cave dwellings, the need for a model that describes the occurrence of thoron and its decay products indoors has arisen. This work presents such a model from the emergence of thoron in the building material until the decay to the stable (208)Pb and discusses the various influences on the occurrence of these nuclides. The model makes possible to predict the exposure of people staying in a room to thoron and its decay products and--combined with a dose model--to calculate their inhalation doses from easily measurable data.

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History of Diffusion Batteries in Aerosol Measurements

Knutson¹

1999

Aerosol Science and Technology

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Electrical mobility and size distribution of aged 212Pb nanometer carriers in nitrogen gas

Cited by 4 publications

References 33 publications

ICRP Publication 137: Occupational Intakes of Radionuclides: Part 3

ICRP Publication 137: Occupational Intakes of Radionuclides: Part 3

Thoron in indoor air: modeling for a better exposure estimate

History of Diffusion Batteries in Aerosol Measurements

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