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Friday, July 24, 2020 | History

2 edition of Determination of effective doses from radionuclides in the Columbia River sediments found in the catalog.

Determination of effective doses from radionuclides in the Columbia River sediments

Renpo Wu

Determination of effective doses from radionuclides in the Columbia River sediments

by Renpo Wu

  • 311 Want to read
  • 32 Currently reading

Published .
Written in English

    Subjects:
  • Radioisotopes -- Environmental aspects -- Columbia River.,
  • Radioactive substances in rivers, lakes, etc. -- Washington (State) -- Hanford.,
  • River sediments -- Washington (State) -- Hanford.,
  • Radioactive substances in rivers, lakes, etc. -- Columbia River.,
  • River sediments -- Columbia River.,
  • Radioisotopes -- Environmental aspects -- Washington (State) -- Hanford.,
  • Radiation -- Dosage.,
  • Radioisotopes in the body.

  • Edition Notes

    Statementby Renpo Wu.
    The Physical Object
    Pagination140 leaves, bound. :
    Number of Pages140
    ID Numbers
    Open LibraryOL15395286M

    The measured value of radon was below the recommended value of UNSCEAR and the US EPA. The effective dose due to the intake of radon in the water was estimated using the measured activity of Rn as shown in Table 5. The effective dose of radon intake ranged from μSv y −1 to μSv y −1 with an average value of μSv y −1. the sediments and radionuclides in the streambed be­ tween the reactors and McNary Dam (fig. 1). The purpose of the investigation was to determine the decay, distribution, and movement of radionuclides in the Columbia River. In particular, information was de­ sired on (1) the spatial and temporal distributions of Atomic Energy Commission.

      The dose conversion factors for the measured isotopes are 13 and 28 nSv/Bq for Cs and 90 Sr, respectively, for adults. Using the activities of Cs and 90 Sr measured in fish taken from the various waterways during this study, estimates of committed effective doses to a person eating 3 kg of the fish annually are given in Table 2. Calculation of the effective dose equivalent takes into account the long-term (50 years) internal exposure from radionuclides absorbed into the body during the current year. The effective dose equivalent is the sum of individual committed (50 years) organ doses multiplied by tissue weighting.

    In this study, we investigated the temporal changes of concentrations and amounts of these radionuclides (90Sr and Cs) in surface water and river bed sediments. Unfortunately, this book can't be printed from the OpenBook. If you need to print pages from this book, we recommend downloading it as a PDF. Visit to get more information about this book, to buy it in print, or to download it as a free PDF.


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Determination of effective doses from radionuclides in the Columbia River sediments by Renpo Wu Download PDF EPUB FB2

Determination of effective doses from radionuclides in the Columbia River sediments Public Deposited. Analytics × Add to Cited by: 1. Inventories of ,pu, Am, I37CS and 'Co in Columbia River Sediments from Hanford to the Columbia River Estuary.

Limits for Intakes of Radionuclides by Workers, Publicat Partsincluding addenda and supplements, (). Amounts of radionuclides from the Hanford reactors contained in bed sediments of the Columbia River were estimated by two methods: (1) from data on radionuclide concentration for the bed sediments Cited by: 9.

@article{osti_, title = {Radionuclide releases to the Columbia River from Hanford Operations, Hanford Environmental Dose Reconstruction Project}, author = {Heeb, C M and Bates, D J}, abstractNote = {The purpose of the Hanford Environmental Dose Reconstruction (HEDR) Project is to estimate the radiation dose that individuals could have received as a result of radionuclide.

collected from the river having six (6) species. Papyrocranus. afer. had the highest mean concentration and dose rate of 40 K - of values ±Bqkg 1 and mGyhr-1 respectively. Also, Tilapia zilli had the highest mean concentration and dose rate of Ra with values ± Bqkg-1 and x mGyhr 1 respectively.

Where D is the effective dose as a result of ingestion of the radionuclide in food, C is the effective dose conversion factor of the radionuclide given in Table 2 (Islam et al, ).

A is the activity concentration of the nuclides in the ingested food, while R represents the annual consumption rate of. Median effective concentration (EC50), the toxicant concentration inhibiting luminescence by 50%, was determined for each sample with a control (2% NaCl) and four sample dilutions (%, %, %, and 45% v/v) after 5- and min exposure periods at 20 °C.

Tests were conducted on both filtered ( μm) and nonfiltered porewater samples. The radiation doses from marine pathways by naturally occurring radionuclides other than Po are about one-third of the dose from Po, the main contributors to this dose being Pb, 40 K, 87 Rb,Ra,U and 14 C.

Table clearly demonstrates that natural radionuclides are the dominant species in the marine environment. EPA R January Revision 0.

Radiological Laboratory Sample Analysis Guide for Incidents of National Significance — Radionuclides in Water.

TABLE 7 The Estimated Exposure Doses for Fish of the Yenisei River Distance from the source of Dose rate from incorporated discharge (km) technogenic radionuclides (mGy year'1) Upstream 80 Downstream 16 60 Natural radiation background Radioactive contamination of the Yenisei.

The largest radionuclide releases to the Columbia River occurred between and when most reactors operated simultaneously. An average of 10,–12, curies per day was discharged. During these times, a typical nearby resident may have received a yearly radiation dose increase of 1–5 mrem per year.

However, a person who. The annual effective dose equivalent received by a member of the public is calculated from the absorbed dose rates by using dose conversion factor of Sv/Gy and the occupancy factor for outdoor and indoor was (5/24) and (19/24) respectively (Ramasamy et al., ). in terms of the total effective dose.

The total effective dose is the sum of the effec tive dose equivalent The contribution of radionuclide releases to the Columbia River from Hanford Site facilities. swimming, and exposure to sediments during shoreline activities).

D Determination of the Location of the MEI. DETERMINATION FOR LEVELS OF RADIONUCLIDES OF URANIUM, THORIUM AND POTASSIUM IN WATER, SEDIMENTS AND ALGAE SAMPLES FROM SELECTED COASTAL AREAS OF LAGOS, NIGERIA; USING ENERGY DISPERSIVE X-RAY FLOURESCENCE.

S.O. Okeniyi, M.D. Faruruwa and A.B. Ngokat Chemistry Department, Nigerian Defence Academy, PmbKaduna. AN ABSTRACT OF THE THESIS OF Renpo Wu for the degree of Master of Science in Radiation Health presented on Aug Title: Determination of Effective Doses from Radionucli.

where E (N,α) is the conversion coefficient from radioactivity per area to effective dose for radionuclide N exponentially distributed in ground at a relaxation depth of α (Sv/h per Bq/m 2); y Ni is the intensity of the i-th photon emitted from radionuclide N (per decay); e Ni is the energy of the i-th photon emitted from nuclide N (MeV); E (e Ni) is the conversion coefficient from air kerma.

The annual effective dose due to inhalation for adults (smokers) for Ra varied from to microSv/y (average microSv/y), while for Ra from to microSv/y (average Review all the available HEDR Project documents related to the published Columbia River dose calculations and select the best available information related to the quantities of each of the eight radionuclides listed above that were released to the Columbia River between and On the contrary, the levels of radionuclides in water and sediments from the Rhine River are comparably low and can only be detected with sophisticated analytical procedures.

Calculation of the total effective dose accounts for the long-term (50 yrs) internal exposure from radionuclides absorbed into the body during the current year. The committed effective dose equivalent is the sum of individual committed (50 yrs) organ doses multiplied by tissue weighting factors.

This work was carried out to measure the radioactivity level in the coastal areas of Nigeria by gamma counting of river sediment samples and assess the radiological impact associated with the use of the river sediments as building material.

The method of gamma spectrometry with a cm by cm NaI(Tl) detector was employed in determining 40K, U and Th levels in 95 and 38 sediment.The total effective dose is the sum of the effective dose equivalent from external sources and the committed effective dose equivalent for internal exposure, which are summarized here and described in more detail in 10 CFR“Occupational Radiation Protection Program.” The committed effective dose equivalent is the sum of doses to organs and tissues that is.Between July and Julymonthly samples of water collected near the mouth of the Columbia River were analyzed for Pu and Am to budget the annual quantity of these radionuclides exported.