Author: Antti Luukko
Publisher:
ISBN:
Category :
Languages : de
Pages : 8
Book Description
Nuclear resonant Absorption of gamma rays in _1hn1_1hn4 N and _1hn2_1hn8 Si
Nuclear Resonant Absorption of Gamma Rays in 14N and 28 Si
Measurement of Nuclear Resonance Absorption of Gamma Rays
Author: Richard Clair McCall
Publisher:
ISBN:
Category :
Languages : en
Pages : 148
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 148
Book Description
Studies of Nuclear Resonant Absorption of Gamma Rays
Studies of Nuclear Resonant Absorption of Gamma Rays. Final Report
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The feasibility of employing the Mossbauer resonant absorption phenomenon for new and useful applications of radioisotopes was studied and evaluated. For these experimental studies radioactive Co/sup 57/ sources were used which allow observations of the Mossbauer resonance in Fe/sup 57/ at room temperatures. However, the results of the investigations can be extrapolated to other Mossbauer isotopes which, unfortunately, usually require low-temperature apparatus to obtain an appreciable fraction of recoilless emissions and absoiptions. The investigations centered aiound the utilization of the Mossbauer effect for practical problems in measui ement and control technology. The use of nuclear resonant techniques in the general areas involving small velocity, acceleration, and displacement measurements appears very promising. For example, velocities in the range from 0.005 to 0.0l5 cm/sec are easily measured using Fe/ sup 57/ nuclear resonance, and this range can be extended several orders of magnitude in both directions if other sources and techniques are endployed. Measurements of gravitational fields in interplanetary space or on the surfaces of celestial bodies, together with altitude measurements of space vehicles, using Mossbauer techniques do not appear practical because the measurement times required to obtain reasonably accurate results is of the order of hours or days under the most favorable circumstances. Experimental measurements of the effects of high pressures on the fractional resonant absorptions showed no observable changes when a Co/sup 57/-stainless steel source was subjected to pressures up to 40,000 psi, although higher pressures or other Mossbauer sources may make pressure measurements practical. Experiments showed that it is possible to determine the direction and strengths of homogeneous magnetic fields in a range from 300 to 1000 gauss by measuring the percentage of nuclear resonance in iron foils. Although the method is not, in general, as accurate as conventional techniques, such a system warrants further study since it might have definite practicality when hostile environments or accessibility problems limit or prohibit the use of conventional techniques. Initial studies also showed that nuclear resonance techniques could be used to measure the amplitudes of acoustical (mechanical) motion in the megacycle frequency region. The results gave every indication that such measurements could be extended to higher frequencies and possibly into the hypersonic, kilo-megacycle ranges where currently there are no suitable methods available to measure acoustical power or acoustical energy densities. (auth).
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The feasibility of employing the Mossbauer resonant absorption phenomenon for new and useful applications of radioisotopes was studied and evaluated. For these experimental studies radioactive Co/sup 57/ sources were used which allow observations of the Mossbauer resonance in Fe/sup 57/ at room temperatures. However, the results of the investigations can be extrapolated to other Mossbauer isotopes which, unfortunately, usually require low-temperature apparatus to obtain an appreciable fraction of recoilless emissions and absoiptions. The investigations centered aiound the utilization of the Mossbauer effect for practical problems in measui ement and control technology. The use of nuclear resonant techniques in the general areas involving small velocity, acceleration, and displacement measurements appears very promising. For example, velocities in the range from 0.005 to 0.0l5 cm/sec are easily measured using Fe/ sup 57/ nuclear resonance, and this range can be extended several orders of magnitude in both directions if other sources and techniques are endployed. Measurements of gravitational fields in interplanetary space or on the surfaces of celestial bodies, together with altitude measurements of space vehicles, using Mossbauer techniques do not appear practical because the measurement times required to obtain reasonably accurate results is of the order of hours or days under the most favorable circumstances. Experimental measurements of the effects of high pressures on the fractional resonant absorptions showed no observable changes when a Co/sup 57/-stainless steel source was subjected to pressures up to 40,000 psi, although higher pressures or other Mossbauer sources may make pressure measurements practical. Experiments showed that it is possible to determine the direction and strengths of homogeneous magnetic fields in a range from 300 to 1000 gauss by measuring the percentage of nuclear resonance in iron foils. Although the method is not, in general, as accurate as conventional techniques, such a system warrants further study since it might have definite practicality when hostile environments or accessibility problems limit or prohibit the use of conventional techniques. Initial studies also showed that nuclear resonance techniques could be used to measure the amplitudes of acoustical (mechanical) motion in the megacycle frequency region. The results gave every indication that such measurements could be extended to higher frequencies and possibly into the hypersonic, kilo-megacycle ranges where currently there are no suitable methods available to measure acoustical power or acoustical energy densities. (auth).
Nuclear Resonant Absorption of Gamma Rays in 14N and 28Si
Author: Antti Luukko
Publisher:
ISBN:
Category : Gamma rays
Languages : en
Pages : 8
Book Description
Publisher:
ISBN:
Category : Gamma rays
Languages : en
Pages : 8
Book Description
Absorption of [gamma]-rays
Author: W. S. Snyder
Publisher:
ISBN:
Category : Absorption
Languages : en
Pages : 36
Book Description
Publisher:
ISBN:
Category : Absorption
Languages : en
Pages : 36
Book Description
Nuclear Resonant Absorption of Gamma Rays in ¿p14¿sN and ¿p28¿sSi
Author: Antti Luukko
Publisher:
ISBN:
Category : Gamma rays
Languages : en
Pages : 8
Book Description
Publisher:
ISBN:
Category : Gamma rays
Languages : en
Pages : 8
Book Description
Studies of Nuclear Resonant Absorption of Gamma Rays. Quarterly Report No. 4 Covering Period June 1, 1961 to August 31, 1961
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The effect of polarizing mngnetic field intensity on the nuclear resonant absorption was studied by varying the field strength at a 1-mc Co/sup 57/ source from 0 to 1000 gauss while keeping the absorber between the poles of a magnet having a fixed field of 800 gauss. The rates of resonance absorption change with field intensity were greatest in the region of 300 to 1000 gauss, and the% nuclear resonant absorption for 1000-gauss fields was 8.5 and 26% for perpendicular and parallel fields, respectively, as compared with 15% for no fields. Other absorption measurements for Co/sup 57/ sources are also reported. Calculations on the use of nuclear resonant absorption to measure gravitational fields and altitudes were made which indicates that this application is not promising. (D.L.C.).
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The effect of polarizing mngnetic field intensity on the nuclear resonant absorption was studied by varying the field strength at a 1-mc Co/sup 57/ source from 0 to 1000 gauss while keeping the absorber between the poles of a magnet having a fixed field of 800 gauss. The rates of resonance absorption change with field intensity were greatest in the region of 300 to 1000 gauss, and the% nuclear resonant absorption for 1000-gauss fields was 8.5 and 26% for perpendicular and parallel fields, respectively, as compared with 15% for no fields. Other absorption measurements for Co/sup 57/ sources are also reported. Calculations on the use of nuclear resonant absorption to measure gravitational fields and altitudes were made which indicates that this application is not promising. (D.L.C.).
Studies of Nuclear Resonant Absorption of Gamma Rays. Quarterly Report No. 5 Covering Period September 1 to November 30, 1961
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
In experiments to determine if there is any change in the fraction of recoil-free emissions of gamma radiation from Fe/sup 57/ due to pressure increases, no measurable changes were found at pressures up to 40,000 psi. Experi-mental apparatus is being developed to measure the acoustical power of transducers in the megacycle frequency range using nuclear resonance techniques. (J.R.D.).
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
In experiments to determine if there is any change in the fraction of recoil-free emissions of gamma radiation from Fe/sup 57/ due to pressure increases, no measurable changes were found at pressures up to 40,000 psi. Experi-mental apparatus is being developed to measure the acoustical power of transducers in the megacycle frequency range using nuclear resonance techniques. (J.R.D.).