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Biological Effects of Radiation

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All radioactive nuclides emit high-energy particles or electromagnetic waves. When this radiation encounters living cells, it can cause heating, break chemical bonds, or ionize molecules. The most serious biological damage results when these radioactive emissions fragment or ionize molecules. For example, α and β particles emitted from nuclear decay reactions possess much higher energies than ordinary chemical bond energies. When these particles strike and penetrate matter, they...
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Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed...
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Life Tables01:22

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A life table is a statistical tool that summarizes the mortality and survival patterns of a population, providing detailed insights into the likelihood of survival or death across different age intervals within a cohort. By organizing data on survival probabilities and mortality rates, life tables offer a clear snapshot of population dynamics over time. They are extensively used in demography, public health, actuarial science, and ecology to analyze life expectancy, design health interventions,...
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Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
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Many heavier elements with smaller binding energies per nucleon can decompose into more stable elements that have intermediate mass numbers and larger binding energies per nucleon—that is, mass numbers and binding energies per nucleon that are closer to the “peak” of the binding energy graph near 56. Sometimes neutrons are also produced. This decomposition of a large nucleus into smaller pieces is called fission. The breaking is rather random with the formation of a large...
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Methods for Analyzing the Impacts of Natural Uranium on In Vitro Osteoclastogenesis
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Mortality among Tennessee Eastman Corporation (TEC) uranium processing workers, 1943-2019.

John D Boice1,2, Sarah S Cohen3, Michael T Mumma4,5

  • 1National Council on Radiation Protection and Measurements, Bethesda, MD, USA.

International Journal of Radiation Biology
|June 27, 2022
PubMed
Summary

This study found little evidence that ionizing radiation exposure increased lung cancer risk in women and men working at Tennessee Eastman Corporation during WWII. Further research is needed to explain elevated cerebrovascular disease mortality.

Keywords:
Manhattan ProjectOak Ridge Calutron WorkersRadiation epidemiologylung canceruranium processing

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Area of Science:

  • Occupational health
  • Radiation epidemiology
  • Nuclear industry worker health

Background:

  • Limited occupational studies exist on women exposed to ionizing radiation.
  • The Tennessee Eastman Corporation (TEC) facility used calutrons for uranium enrichment during World War II, employing thousands of women.
  • This study investigates the long-term health effects of radiation exposure in these workers.

Purpose of the Study:

  • To assess the mortality risks associated with occupational exposure to ionizing radiation.
  • To investigate lung cancer and other disease risks in female and male workers at a uranium enrichment facility.
  • To evaluate the effectiveness of uranium dust inhalation and alpha particle exposure in causing lung cancer.

Main Methods:

  • A cohort of 13,951 women and 12,699 men employed at TEC between 1943-1947 was studied.
  • Comprehensive dose reconstruction estimated lung doses from uranium dust inhalation.
  • Mortality data through 2018/2019 was analyzed using standardized mortality ratios (SMRs) and Cox proportional hazards models.

Main Results:

  • Statistically significant elevated SMRs were observed for lung cancer (1.25), nonmalignant respiratory diseases (NMRDs) (1.23), and cerebrovascular disease (CeVD) (1.13).
  • Lung cancer risk estimates did not differ significantly between men and women.
  • No association was found between radiation dose and NMRD or non-Hodgkin lymphoma.

Conclusions:

  • Inhalation of uranium dust and associated alpha particle exposure showed limited evidence of increasing lung cancer risk.
  • The risk of lung cancer from this exposure appears less effective compared to other exposure types.
  • The unexplained elevation in CeVD requires further investigation into non-radiation-related workplace or lifestyle factors.