Fallout radiation energy distribution as a function of altitude by T. W. De Vries

Cover of: Fallout radiation energy distribution as a function of altitude | T. W. De Vries

Published by Nuclear Aerospace Research Facility, General Dynamics in Fort Worth, Tex .

Written in English

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  • Radioactive fallout,
  • Radiation -- Measurement

Edition Notes

Book details

StatementT.W. De Vries.
ContributionsUnited States. Office of Civil Defense., General Dynamics. Nuclear Aerospace Research Facility.
LC ClassificationsQC475 .D35 1964
The Physical Object
Paginationx, 213 p. :
Number of Pages213
ID Numbers
Open LibraryOL24121627M
LC Control Number2009483102

Download Fallout radiation energy distribution as a function of altitude

Division Report FZK, Fallout Radiation Energy Distribution as a Function of Altitude. The basic objectives of the present study (FZK, 1 July ) were to improve the mathematical model and extend to low altitudes the fallout gamma-ray spectra calculations of the previous study.

Fallout Patterns Distribution of radioactivity is determined by high altitude wind & atmospheric conditions beyond the control of test conducting personnel.

Depending on test yield and wind velocity (15mph) radioactive fallout is spread within hours over large. A high altitude detonation results in mostly smaller particles, but fallout will be present in any event.

Smaller particles lose most of their radiation in 24 hours or so. Larger particles (sand-sized) may take 3 or 4 days or more for their radiation output to fall to safer levels. Simulation of the radiation fallout from gamma-ray energy distribution. Using this experimental approach Horng and Jiang () evaluated a raindrop growth time in a cloud, Greenfield et al.

() estimated the time of raindrops m altitude) implements a continuousCited by: 2. in fallout, and to their special biological affinity. I is a βand γemitter with a half-life of d (specific activityCi/g) Its decay energy is keV β, keV γ.

It constitutes some 2% of fission-produced isotopes - Ci/kt. Iodine is readily absorbed by the body and concentrated in one small gland, the thyroid. The particle energy distribution follows a power function of the form E − up to 10 15 eV; above that energy, the distribution steepens to E −3.

The fluence rate of the GCR at the location of the Earth is fairly constant in time, and these energetic nuclei approach the Earth approximately isotropically.

Book Page: COMMERCIALLY AVAILABLE FALLOUT METERS. In an American does not have many choices if he wants to buy an off-the-shelf dose rate meter suitable for measuring the high levels of fallout radiation that would result from a nuclear attack. 3. Results and Discussion Figure 2 shows the dependence of the quasi-effec- tive energy of natural radiation over Antarctica on the ice-based altitude above sea level.

Natural radiation emanating from the ground is mainly from 4°K, U and Th, and is comprised of low-energy radiation compared with cosmic-rays.

depth distribution (exponential or uniform) of Cs and Cs within the ground, and on the altitude of the detector above the ground. The calculations suggest that the sensitivity of the Compton-to-peak method is greatest for the initial period following nuclear fallout when Cs and.

Residual radiation and fallout. Residual radiation is defined as radiation emitted more than one minute after the detonation. If the fission explosion is an airburst, the residual radiation will come mainly from the weapon debris.

If the explosion is on or near the surface, the soil, water, and other materials in the vicinity will be sucked upward by the rising cloud, causing early (local) and.

absorbed accident activity per unit aerial airborne altitude analysis angle Appendix applications Atomic Energy Agency attenuation BECK calculated calibration Chernobyl coefficient concentrations contributions cosmic ray count rate crystal dependence deposition depth distribution detection detector determination developed distribution dose.

Most radiation risk estimates are based on X-ray radiation with a quality factor being applied to estimate the effects of other types of radiation. However, there are significant differences between the effect of exposure to X-ray radiation and exposure to high-energy nucleon radiation.

This problem may not be resolved for decades. Because the fallout cloud disperses with time and distance from the explosion, and radioactivity decays over time, the highest radiation exposures are generally in areas of local fallout.

Figure 3. Wind shear (variations in wind speed and direction with altitude) causes fallout to spread over large areas.

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Finished. AFSWP January Fallout Symposium US DOE Opennet document reference AFSWP January Fallout Symposium US DOE Opennet document reference Fallout, deposition of radioactive materials on Earth from the atmosphere.

The terms rain out and snow out are sometimes used to specify such deposition during precipitant weather. Radioactivity in the atmosphere may arise from (1) natural causes, (2) nuclear or thermonuclear bomb explosions, and. The radiation monitoring system, shown in Fig.

1, has a radiation measurement system comprising of a gamma radiation detector and the detection platform (air-borne and ground-based vehicles), which represents the front-end of a radiation monitoring a nuclear incident involves multiple emissions such as alpha, beta, and gamma, gamma radiation has the highest.

With low-altitude and groundbursts, exposure to local fallout downwind from the target will lead to genetically significant doses in the survivors. Using arguments similar to those applied to the prompt radiation exposure, one may assume that there is a lethal area in the central portion of the plume path and survival zones on the periphery.

A particular fallout model based on data given in the U.S. Atomic Energy Commission\us handbook on \uCThe Effects of Nuclear Weapons\uD is considered in some detail, and the effect of an ionization profile (ion number density as a function of altitude) on the propagation of.

((^Tw)ak \ with altitude (without radiation) Figure The changes in P, 1/4versus y for the system considered 87 in Fig. Figure Effects of convection balance factor, y, on the changes of 88 (ATewa)) with altitude in a system with radiation factor a=   If one had, e.g., foot of packed earth between you and the fallout the protection you would have two halving thicknesses, and the radiation rate would be reduced by1/4 (protection factor of 4), for feet the rate would be 1/8 that of outside (protection factor of 8), for feet the rate would be 1/16 of outside (protection factor of The distribution of weapon energy yield is altered significantly by the enhanced radiation nuclear warhead.

In simplest terms an enhanced radiation warhead is designed specifically to reduce the percentage of energy that is dissipated as blast and heat with a consequent increase in the percentage yield of initial radiation.

There are two versions of the mod, one with the Fallout 3/Fallout New Vegas style penalties and one with the SPECIAL penalties found in Fallout, Fallout 2, and Fallout Tactics.

There's no extra penalty for reaching rads, as that's still instantly fatal. The Fallout 3 Radiation Poisoning stages are: rads - Minor Radiation Poisoning. -1 END. Neutron bombs are purposely designed with explosive yields lower than other nuclear weapons. Since neutrons are scattered and absorbed by air, neutron radiation effects drop off rapidly with distance in air.

As such, there is a sharper distinction, relative to thermal effects, between areas of high lethality and areas with minimal radiation doses. All high yield (more than c. 10 kiloton. Fallout 3 Gamma and Beta Radiation 4 Radiation Hazards From External and Internal Sources 4 Protection Against External Radiation From Fallout 5 Effect of Distance 5 Effect of Time on Intensity of Radiation _ 5 Effect of Shelter and Shielding 6 Shelter 6 Radiation Attenuation 7 Decontamination 8 Work Schedules in Fallout Areas 9.

Castle Bravo was the first in a series of high-yield thermonuclear weapon design tests conducted by the United States at Bikini Atoll, Marshall Islands, as part of Operation ted on March 1,the device was the most powerful nuclear device detonated by the United States and its first lithium deuteride fueled thermonuclear weapon.

Castle Bravo's yield was 15 megatons of TNT, 2. Edward A Schuert, "A Fallout Forecasting Technique with Results Obtained at the Eniwetok Proving Ground", U.S. Naval Radiological Defense Laboratory, report USNRDL TR, as published in the Hearings of the Special Subscommittee on Radiation, Joint Committee on Atomic Energy, "The Nature of Radioactive Fallout and Its Effects on Man", Part 1.

distribution across all wavelengths is strictly a function of the absolute temperature T. For spacecraft and atmosphere covered planets these distributions are modified, but we usually use the perfect blackbody energy distribution at least as an initial estimate. Planck’s equation gives us the spectral energy distribution of a perfect blackbody.

characteristics of this radiation will vary The primary hazard of the re-in accordance with the relative extents sidual radiation results from the creation to which fission and fusion reactions of fallout particles \\\(§ et seq.) contribute to the energy of the weapon.

which incorporate the radioactive The residual radiation from a. Energy Distribution in Nuclear Explosions. A typical nuclear explosion of a tactical-scale weapon will have its energy expended 50% as blast, 35% as thermal radiation (infrared, visible, and ultraviolet light and some soft x-rays), and 15% as nuclear radiation.

Deposition densities (Bq m-2) of all important dose-contributing radionuclides occurring in nuclear weapons testing fallout from tests conducted at Bikini and Enewetak Atolls () have been estimated on a test-specific basis for all the 31 atolls and separate reef islands of the Marshall Islands.A complete review of various historical and contemporary data, as well as meteorological.

Typical distribution of energy released 6. Effects of a Nuclear Explosion Sequence of events, Part I DELAYED NUCLEAR RADIATION / FALLOUT Origin: material lifted into the fireball right after the explosion (as a function of peak overpressure) 98% Approximate average values of cloud height and radius (at about 10 minutes after the explosion), attained in land surface or low air bursts, for conditions most likely to be encountered in the continental United States, are given in Fig.

as a function of the energy yield of the explosion. The flattening of the height curve in the range of. Cosmic rays are high-energy protons and atomic nuclei which move through space at nearly the speed of originate from the sun, from outside of the solar system, and from distant galaxies.

Upon impact with the Earth's atmosphere, cosmic rays can produce showers of secondary particles that sometimes reach the from the Fermi Space Telescope () have been interpreted as.

Relative effectiveness of structures as protection from gamma radiation from cloud and fallout sources as a function of source energy Thesis/Dissertation Fingerlos, J P In the event of a release of radioactive material, it is necessary to know the doses the public could receive in order to make decisions that minimize the public's risk.

Blackbody Radiation, Boltzmann Statistics, Temperature, and Equilibrium Penner, Chapters 1 and 2 has great details.A good statistical mechanics book (like Davidson, Chapters ) is a good source for further information especially on statistical aspects.

A qualitative comparison of the rate of arrival of thermal radiation energy at a distance from the burst point as a function of time for a megaton-range explosion at high altitude and in a sea-level atmosphere is shown in Fig. In a low (or moderately low) air burst, the thermal radiation is emitted in two pulses, but in a high.

radiation on the developing fetus, embryo, and young infant. comes from a study of fetal, neonatal, and postnatal mortality rates for each state in the United States and for a number of foreign couatries.

following the detonation of specific nuclear weapons shows a geographical distribution that coizcides with the known long. Cosmic rays are immensely high-energy radiation, mainly originating outside the Solar System.[1] They may produce showers of secondary particles that penetrate and impact the Earth's atmosphere and sometimes even reach the surface.

Composed primarily of high-energy protons and atomic nuclei, they are of mysterious origin. The Effects of Nuclear Weapons - Glasstone and Dolan DOD Authoritative Reference on Atomic Explosions, Damage, Radiation, Fallout, EMP, Biological, Radio and Radar Effects (CD-ROM) [Department of Defense] on *FREE* shipping on qualifying offers.

The Effects of Nuclear Weapons - Glasstone and Dolan DOD Authoritative Reference on Atomic Explosions, Damage, RadiationReviews: 1. The Development of Materials for Structures and Radiation Shielding in Aerospace (Paperback) by National Aeronautics and Space Adm Nasa and a great selection of related books, art and collectibles available now at.

Fallout Protection Last updated Ma Cover of Fallout Protection, Fallout Protection: What To Know And Do About Nuclear Attack was an official United States federal government booklet released in December by the United States Department of Defense and the Office of Civil first page of the book is a note from then-U.S.

Secretary of Defense Robert McNamara.The photon intensity as a function of energy, taken from the referenced report, is shown in Figure In this energy spectrum, the dominance of gamma rays between keV and 2 MeV is apparent.

Photon energy spectra for fallout have been measured for times ranging from two hours to hours following detonation (Cook ~.

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