Unlike some other reproductions of classic texts (1) We have not used OCR(Optical Character Recognition), as this leads to bad quality books with introduced typos. (2) In books where there are images such as portraits, maps, sketches etc We have endeavoured to keep the quality of these images, so they represent accurately the original artefact. Although occasionally there may be certain imperfections with these old texts, we feel they deserve to be made available for future generations to enjoy.

The United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR) established by the General Assembly in 1955 assesses the levels and effects of exposure to ionizing radiation on human health and the environment. This is the second of four volumes of scientific annexes that provides the supporting scientific deliberations for the UNSCEAR 2020/2021 report to the United Nations General Assembly. Annex B "Levels and effects of radiation exposure due to the accident at the Fukushima Daiichi Nuclear Power Station: implications of information published since the UNSCEAR 2013 Report" summarizes all relevant scientific information (peer reviewed literature and monitoring data) available up to the end of 2019. These data relate to the levels and effects of radiation exposure due to the accident at the Fukushima Daiichi Nuclear Power Station. The aim of the report is to provide a summary of all scientific information and an appraisal of the implications of this information for the UNSCEAR 2013 Report.

The United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR) established by the General Assembly in 1955 assesses the levels and effects of exposure to ionizing radiation on human health and the environment. This is the first of four volumes of scientific annexes that presents the supporting scientific deliberations for the UNSCEAR 2020/2021 report to the United Nations General Assembly. Annex A "Medical exposure to ionizing radiation" presents a comprehensive global estimate of the frequencies and doses from medical exposure, their distribution and trends in medical categories in the 2009-2018 period. The annex considers four general categories of medical practice using ionizing radiation: (a) diagnostic radiology, including dental radiology and computed tomography, (b) interventional radiology (image-guided interventional procedures), (c) nuclear medicine and (d) radiation therapy.

The United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR) established by the General Assembly in 1955 assesses the levels and effects of exposure to ionizing radiation on human health and the environment. This is the last of four volumes of scientific annexes provide the supporting scientific deliberations for the UNSCEAR 2020/2021 report to the General Assembly. Annex D 'Evaluation of occupational exposure to ionizing radiation' presents the estimated average annual effective and collective doses to workers for each major work sector and sub-sector involving the use of ionizing radiation; estimated worldwide level of occupational exposure for different sectors involving exposure to natural sources and to human-made sources of radiation; and analysis of temporal trends in occupational exposure. It is based on data provided by United Nations Member States and international organizations, as well as peer reviewed literature and national reports on radiation exposure to workers

The United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR) established by the General Assembly in 1955 assesses the levels and effects of exposure to ionizing radiation on human health and the environment. This is the third of four volumes of scientific annexes provide the supporting scientific deliberations for the UNSCEAR 2020/2021 report to the General Assembly. Annex C "Biological mechanisms relevant for the inference of cancer risks from low dose and low-dose rate radiation" synthesizes the current knowledge on biological mechanisms of radiation actions at low doses and low-dose-rates, and assesses the implications for understanding the processes of cancer development after exposure to ionizing radiation, and for dose-response relationships of radiation-induced cancers.

Millions of Americans use e-cigarettes. Despite their popularity, little is known about their health effects. Some suggest that e-cigarettes likely confer lower risk compared to combustible tobacco cigarettes, because they do not expose users to toxicants produced through combustion. Proponents of e-cigarette use also tout the potential benefits of e-cigarettes as devices that could help combustible tobacco cigarette smokers to quit and thereby reduce tobacco-related health risks. Others are concerned about the exposure to potentially toxic substances contained in e-cigarette emissions, especially in individuals who have never used tobacco products such as youth and young adults. Given their relatively recent introduction, there has been little time for a scientific body of evidence to develop on the health effects of e-cigarettes. Public Health Consequences of E-Cigarettes reviews and critically assesses the state of the emerging evidence about e-cigarettes and health. This report makes recommendations for the improvement of this research and highlights gaps that are a priority for future research. Table of Contents Front Matter Summary Summary Annex Report Conclusions by Level of Evidence 1 Introduction 2 Committee Approach Section I: E-Cigarette Devices, Constituents, and Exposures 3 E-Cigarette Devices, Uses, and Exposures 4 Nicotine 5 Toxicology of E-Cigarette Constituents 6 Research Needs: E-Cigarette Devices, Constituents, and Exposures Section II: Effects of E-Cigarettes on Health 7 Modes of Action 8 Dependence and Abuse Liability 9 Cardiovascular Disease 10 Cancers 11 Respiratory Diseases 12 Oral Diseases 13 Developmental and Reproductive Effects 14 Injuries and Poisonings 15 Research Needs: Effects of E-Cigarettes on Health Section III: Public Health Implications of E-Cigarettes 16 Combustible Tobacco Cigarette Smoking Among Youth and Young Adults 17 Smoking Cessation Among Adults 18 Harm Reduction 19 Modeling of E-Cigarette Use 20 Research Needs: Public Health Implications of E-Cigarettes 21 Concluding Observations Appendix A: Questions from the Center for Tobacco Products of the Food and Drug Administration Submitted for the Committee's Consideration Appendix B: Search Strategy and Quality Assessment Appendix C: Glossary of Terms Related to E-Cigarettes Appendix D: Cytotoxicity Tables Appendix E: Public Meeting Agenda Appendix F: Committee Biosketches

The United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR) assesses the levels and effects of exposure to ionizing radiation. UNSCEAR's scientific findings underpin radiation risk evaluation and international protection standards. This report comprises a report to the General Assembly with two underpinning scientific annexes. The first annex recapitulates and clarifies the philosophy of science as well as the scientific knowledge for attributing observed health effects in individuals and populations to radiation exposure, and distinguishes between that and inferring risk to individuals and populations from an exposure. The second annex reviews the latest thinking and approaches to quantifying the uncertainties in assessments of risk from radiation exposure, and illustrates these approaches with application to examples that are highly pertinent to radiation protection. The report is a landmark publication in terms of our understanding of the confidence that can be attached to the attribution of health effects in individuals and populations, and to the estimation of risks inferred from exposure to ionizing radiation.