ISSN:0894-0401    

DOI:10.13182/NT66-A27555

出版商:Taylor&Francis    

年代:1966

数据来源: Taylor

ISSN:0894-0401    

DOI:10.13182/NT66-A27556

出版商:Taylor&Francis    

年代:1966

数据来源: Taylor

ISSN:0894-0401    

DOI:10.13182/NT66-A27557

出版商:Taylor&Francis    

年代:1966

数据来源: Taylor

ISSN:0894-0401    

DOI:10.13182/NT66-A27559

出版商:Taylor&Francis    

年代:1966

数据来源: Taylor

摘要:

AbstractBORAX-V was the fifth in a series of boiling-water reactors operated by Argonne National Laboratory at the National Reactor Testing Station in Idaho. It was the first integral boiling-water nuclear superheating reactor to be operated in the United States. Super-heated steam was produced, in different experiments, in both the central and peripheral regions of the core. The nominal design maximum power of 20 MW(th) and 850°F exit steam temperature were both exceeded.Operational procedures and results of experiments are discussed. Areas of particular interest and investigation include the following: comparison of a centrally versus a peripherally located superheater core; superheater startup and shutdown cooling problems; superheater flooding reactivity worth and inadvertent flooding hazard; control of power split between the boiler and superheater zones of the reactor core; superheater fuel-cladding-material integrity; plant radioactivity levels; results of operation with defective fuel in both the boiler and superheater areas of the core; in-core instrumentation and data collection; transfer-function and physics experiments; and the water-chemistry program.

ISSN:0894-0401    

DOI:10.13182/NT66-A27561

出版商:Taylor&Francis    

年代:1966

数据来源: Taylor

摘要:

AbstractThe performance of mild steel was excellent during the three-year operation of the Heavy Water Components Test Reactor (HWCTR). Surfaces were covered uniformly with an adherent film of black oxide, and no significant pitting occurred.The total corrosion of mild steel test specimens was 3.1 mg/cm2after 6 months, and 5.5 mg/cm2after 33 months. The rate of iron release to the D2O moderator-coolant was 0.16 mg/cm2per month during the first 6 months and approximately 0.04 mg/cm2per month, thereafter.No problems occurred because of particulate matter in the D2O. The concentration of particulates in D2O was approximately 80 parts per billion (ppb) during the first two years of operation and was approximately 6 ppb during the last year. The purification system operated satisfactorily without a prefilter. The radiation intensity from typical primary circuit piping was approximately 30 mR/h at 3 in. when reactor operation was terminated.

ISSN:0894-0401    

DOI:10.13182/NT66-A27562

出版商:Taylor&Francis    

年代:1966

数据来源: Taylor

摘要:

AbstractThe physical characteristics of99mTc, including a short half-life of 6 h and a nearly monochromatic gamma emission of 140 keV, make it an excellent agent for scintillation scanning. Because of the short half-life and absence of significant beta emission, large amounts of activity may be used, the radiation dose to the patient being very low. Possibilities thus exist for greater resolution through optimal design of collimation and for more rapid scans because of better counting statistics.A colloid of this isotope has been prepared by passing hydrogen sulfide through a solution of 1NHCl containing pertechnetate. This colloid, with an average blood disappearance half-time of 2.5 min, has proved useful in performing scintillation scans of liver, spleen, and bone marrow.A specially designed collimator of 721 holes has provided resolution comparable to the commercially available 31-hole collimator but with a sensitivity considerably greater than the 19-hole collimator. Maximum count rates over the liver are 75 000 to 100 000 counts/min following administration of 10 mCi of the colloid intravenously. Modification of a commercially available scanner has been made by bypassing the contrast enhancement circuits and doubling the speed in order to exploit the high count rates.Count rates over bone marrow are maximally 1/10 to 1/15 of the liver count, and spleen count rates fall in between liver and bone-marrow rates. Estimation of spleen size and extent of functioning marrow are possible in addition to detection of space-occupying disease of the liver.

ISSN:0894-0401    

DOI:10.13182/NT66-A27563

出版商:Taylor&Francis    

年代:1966

数据来源: Taylor

摘要:

AbstractGold-198 with a specific activity of 370 Ci/g and containing<0.1%199Au was produced by the epithermal neutron-capture reaction,197Au(n,γ)198Au. The secondary neutron-capture reaction,198Au(n,γ)199Au, was greatly reduced by a thermal-neutron absorber—a cadmium capsule in which the samples of gold foil and gold-aluminum alloy were irradiated. High-specific-activity198Au with<0.1%199Au is especially useful for medical purposes.

ISSN:0894-0401    

DOI:10.13182/NT66-A27564

出版商:Taylor&Francis    

年代:1966

数据来源: Taylor

摘要:

AbstractA thermionic energy-conversion diode that uses a liquid metal as the electron collector is evaluated. Liquids, such as cesium, rubidium, or potassium and their alloys, are separated from the hot emitter by the vapor film produced in film boiling. Such a vapor film would maintain electrical separation if the emitter became warped because of radiation damage, thus greatly improving the reliability of the in-core thermionic diode. An experiment showed that stable film boiling occurs for ranges of emitter temperatures and cesium and potassium vapor pressures that are appropriate for thermionic diodes. The typical thermionic series-connected fuel-element geometry can be used in a film-boiling liquid-metal design to produce power in the zero g field of space. The improved tolerance to radiation damage and to emitter evaporation requires more precise control of collector temperatures, a modified startup and shutdown schedule to avoid nucleate boiling, and further development of a new thermal divider to exclude nucleate boiling at the edges of the collector surfaces.

ISSN:0894-0401    

DOI:10.13182/NT66-A27565

出版商:Taylor&Francis    

年代:1966

数据来源: Taylor

摘要:

AbstractPrevious publications have revealed that poled ferroelectrics can be used as detectors of radiation; however, the source of the charge release was speculative. A theoretical derivation using the theory of pyroelectricity is verified by the previously published data and by an especially designed experiment whereby the graph of the normalized charge release as a function of temperature is compared with normalized pyroelectric coefficent data. The experiment verifies quite conclusively that the constant of proportionalityKin the equation,i/A = K (dγ/dt), is equal top/C, wherepis the pyroelectric coefficient andCis the specific heat. The appropriate value forKfor ceramic lead zirconate titanate, Pb(Zr-0.65Ti0.35)O3+ 1 wt% Nb2O5(65:35PZT), is determined to be 0.6 picocoulombs per square centimeter per rad (PZT).

ISSN:0894-0401    

DOI:10.13182/NT66-A27566

出版商:Taylor&Francis    

年代:1966

数据来源: Taylor