Download or read book Ground Penetration of Gamma Radiation Into a Hole in a Simulated Cs137 Fallout Field written by C. E. Clifford and published by . This book was released on 1959 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dose distributions in a cylindrical foxhole due to ground penetration of 0.66 Mev gamma radiation from Cs137 sources near the lip of the hole have been measured for a "ground" of concrete. Ninety percent of the dose due to ground penetration came from contamination within 1 foot of the edge of the hole. Measurements were also made of the dose distributions produced by the lip penetration of a lucite "ground". It was found that the dose produced by a single source under conditions of lip geometry could be calculated with reasonable accuracy by using one half of the infinite medium buildup factor for lip penetration distances of less than 8 mean free paths.

Download or read book GROUND PENETRATION OF RADIATION INTO A HOLE IN A SIMULATED CS137 FALLOUT FIELD written by CANADA. DEFENCE RESEARCH BOARD. DEFENCE RESEARCH CHEMICAL LABORATORIES. and published by . This book was released on 1959 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scattered Gamma Radiation From a Simulated Fallout Field Using Cs137 written by Canada. Defence Research Chemical Laboratories and published by . This book was released on 1958 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Penetration Into Concrete of Gamma Radiation from Fallout written by W. F. Titus and published by . This book was released on 1960 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: The penetration into concrete of gamma radiation from fallout has been measured in an idealized geometry as a function of time after the detonation of a nuclear device. At the same time, the exposure dose rate in air at heights of 3 and 9 ft above the ground was measured with two detectors suspended from a tower and shielded from above with lead so as to be sensitive primarily to radiation from fallout on the ground. For this test a 'sandwich' made of seven concrete slabs, forming a mass of concrete with face dimensions large enough to reduce edge effects to a negligible amount, was buried with its top surface flush with the ground. Remote-reading detectors were placed between the concrete slabs, thus permitting measurements of dose rate as a function of depth in concrete. The concrete mass and the tower were located in the center of a cleared and leveled area approximately 200 yd in diameter. Thus the gamma radiation at the detectors originated from an essentially infinite-plane source of radiation. Results are presented both as a function of time after detonation and of depth of penetration of the radiation into concrete. A comparison of the results with theoretical calculations is made. (Author).

Download or read book United States Naval Radiological Laboratory written by United States. Navy Department. Bureau of Ships and published by . This book was released on with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scattered Gamma Radiation from a Simulated Fallout Field Using Cesium 137 written by J. A. Carruthers and published by . This book was released on 1959 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Shielding Symposium Proceedings written by and published by . This book was released on 1961 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Shielding Symposium Proceedings written by U.S. Naval Radiological Defense Laboratory and published by . This book was released on 1960 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Technical Abstract Bulletin written by Defense Documentation Center (U.S.) and published by . This book was released on 1961-02 with total page 1116 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Simulation of Fallout Gamma Radiation Fields by Monoenergetic Plane Isotropic Sources written by R. L. French and published by . This book was released on 1965 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Detailed comparisons of the results show that the angular distribution of the dose from a fallout field is simulated with reasonable accuracy over most angles by a plane source of Cs-137 or Co-60 and over all angle by a mixture of Ce-144, Cs-137, and Co-60. The simulation of the fallout energy spectra is quite poor, however, even in combinations of the three isotopes are employed. Comparisons of the Monte Carlo data with measured data for monoenergetic plane sources show good agreement.

Download or read book A Comparative Study of Radioactive Source Arrangements for Simulating Fallout Gamma Radiation Fields written by R. L. French and published by . This book was released on 1964 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt: A third source arrangement, called the "compact simulator", was found to simulate the gamma radiation environment equally well. The compact simulator utilizes Ce-144, Cs-137, and Co-60 in a finite plane source 60 feet in radius and in an elevated toroidal source which acts as a virtual source for the remainder of the infinite plane. In the compact simulator, an overhead slab of water acts as a reflector to simulate air scattering.

Download or read book NBS Monograph written by and published by . This book was released on 1964 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings written by and published by . This book was released on 1960 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Ground Penetrating Radiation lip Contribution in a Foxhole from a Fallout Field Simulated by Cobalt 60 written by Michael J. Schumchyk and published by . This book was released on 1960 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dose rate contribution from the lip of a 4-ft-diameter foxhole, located in an infinite contaminated field, averages 68% of the total dose received in the foxhole for the case where the lip contribution is measured and skyshine is calculated. 2. In the case where both are calculated from theory, the dose rate average is 4% lower. 3. Clearing an annulus 2 ft wide around the edge of the foxhole removes about 99% of the lip contribution; therefore, removing about 64% to 68% of the total radiation received in the foxhole.

Download or read book The Energy and Angular Distribution of Gamma Radiation from a Simulated Fallout Field written by J. Ronald Magaw and published by . This book was released on 1968 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Shielding Against Gamma Rays Neutrons and Electrons from Nuclear Weapons written by John Howard Hubbell and published by . This book was released on 1964 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Calculated Gamma ray Dose Distributions in a Phantom Exposed to Fallout and Simulated Fallout written by C. W. Garrett and published by . This book was released on 1967 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gamma-ray depth-dose distributions in a phantom exposed to fallout and to simulated fallout were calculated by the Monte Carlo method. The phantom consisted of a tissue equivalent vertical right cylinder of 60 cm height and 30 cm in diameter. The center of the phantom was 3 ft 8 in. (111.8 cm) above a smooth ground surface uniformly contaminated with 235U fission products. The energy and angle distribution of the gamma rays incident upon the phantom were taken from previous Monte Carlo calculations. The depth-dose distributions were found to be relatively insensitive to fallout age over the period investigated (1 hour to 9 days). The dose rate at the center of the phantom is approximately 65 percent of the free-field dose rate, while that at the lateral surface is approximately 80 percent. Except near the extremities, the dose rate along the vertical axis of the phantom varies at approximately the same rate with height above ground as does the free-field dose rate. Approximately one-half of the dose rate at the center of the phantom is from photons which have suffered previous collisions in the phantom. An additional calculation was performed of the depth-dose distribution within a phantom positioned at the center of a 4 ft diameter by 5 ft deep foxhole located in a 1.12-hr fallout field. The distribution in the horizontal midplane of the phantom was found to be quite similar in shape to the above ground case except for a sharper dropoff of the dose away from the lateral surface. As would be expected, however, the axial distributions is quite different from that found above ground. (Author).