Thyroid concentration of barium and radium

Middlesworth, L. Van; Robison, W.L.

doi:10.1016/0047-0740(75)90013-3

Cited by 4 publications

(1 citation statement)

References 5 publications

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“…The derived transfer rate from plasma to ST1 is 0.1 × 70 d −1 = 7 d −1 and from ST1 to plasma is ln(2)/1 d = 0.693 d −1 . (347) Despite the low intermediate-term retention of injected barium in soft tissues, a non-trivial portion of total-body barium can be found in human soft tissues after chronic exposure (Schroeder et al., 1972; ICRP, 1973, 1975; Schlenker et al., 1982). Much of this may reside in small, relatively insoluble deposits of barium sulphate (Garner, 1960; Schroeder et al., 1972; Van Middlesworth and Robison, 1975; Doig, 1976). In this model, ST2 is used to account for nearly all the barium in soft tissues during chronic intake.…”

Section: Barium (Z = 56)mentioning

confidence: 99%

ICRP Publication 137: Occupational Intakes of Radionuclides: Part 3

Paquet¹,

Bailey²,

Leggett³

et al. 2017

Ann ICRP

236

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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: Barium (Z = 56)mentioning

confidence: 99%

ICRP Publication 137: Occupational Intakes of Radionuclides: Part 3

Paquet¹,

Bailey²,

Leggett³

et al. 2017

Ann ICRP

236

View full text Add to dashboard Cite

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Barium

1993

Ann ICRP

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Accumulation and Localization of Radiocalcium in the Rat Thyroid Gland*

1978

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To determine the rate of accumulation of radiocalcium (45Ca) in the thyroid gland, the concentration of radiocalcium was measured in the blood serum and thyroid gland at various time intervals up to 7 days after a single ip injection of 45Ca in rats. The ratio of the 45Ca concentration in thyroid gland to serum (T:S) increased with the time interval after injection. Thyroid activity was varied by hypophysectomy or by feeding a low iodine diet with or without added thiouracil. The more active the gland, the faster it equilibrated with the serum 45Ca and the less was the T:S in the steady state. The equilibration was much slower than for radioiodide, taking several days in normal control rats and hours in very active glands. Autoradiographs showed that the 45Ca concentration was higher in association with the follicular epithelium than with the follicular lumen at 1 h or less after injection. However, at 24 h, the concentration of 45Ca was higher in the lumen than elsewhere in the gland. To determine rate constants describing the equilibration, the data in the normal gland were fitted with a model that took account of the differing rates of equilibration in cell and lumen. The presence of calcium in the lumen indicates that each time the follicular epithelial cell endocytosed stored luminal colloid before secretion, it also took in an appreciable amount of calcium.

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Thyroid concentration of barium and radium

Cited by 4 publications

References 5 publications

ICRP Publication 137: Occupational Intakes of Radionuclides: Part 3

ICRP Publication 137: Occupational Intakes of Radionuclides: Part 3

Barium

Accumulation and Localization of Radiocalcium in the Rat Thyroid Gland*

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