scholarly journals Gamma Radiation from Magnesium-26 under Proton Bombardment

1954 ◽  
Vol 95 (1) ◽  
pp. 99-101 ◽  
Author(s):  
Leonard N. Russell ◽  
Warren E. Taylor ◽  
John N. Cooper
Keyword(s):  
Gamma Radiation ◽  
Proton Bombardment

scholarly journals Gamma-Radiation from Light Nuclei under Proton Bombardment

1948 ◽  
Vol 73 (2) ◽  
pp. 181-182 ◽  
Author(s):  
W. A. Fowler ◽  
C. C. Lauritsen ◽  
T. Lauritsen
Keyword(s):  
Gamma Radiation ◽  
Light Nuclei ◽  
Proton Bombardment

GAMMA RADIATION FROM THE PROTON BOMBARDMENT OF OXYGEN

1954 ◽  
Vol 32 (9) ◽  
pp. 563-570 ◽  
Author(s):  
J. B. Warren ◽  
K. A. Laurie ◽  
D. B. James ◽  
K. L. Erdman
Keyword(s):  
Excited State ◽  
Gamma Radiation ◽  
Ground State ◽  
Gamma Ray ◽  
Radiative Transition ◽  
Proton Bombardment ◽  
First Excited State ◽  
Main Transition ◽  
Bombarding Energy ◽  
Three Components

The nuclear gamma radiation following the non-resonant capture of a proton in O16 has been studied with protons of energies, from 800 kev. to 2.1 Mev. and found to consist of three components. The main transition goes, via a gamma ray of energy that varies with proton bombarding energy, to the [Formula: see text] state of F17. This state, 487 kev. above the ground state, radiates directly to the ground state. In addition there is a weaker direct radiative transition from the capture configuration to the ground state. At energies above Ep = 1.8 Mev. oxide targets bombarded with protons give rise to a radiation of 873 kev. attributed to the presence of the O17 isotope via the reaction O17(p, p′)O17*, the radiation corresponding to the transition from the first excited state of O17 to the ground state.

scholarly journals Gamma Radiation from Proton Bombardment ofLi7

1954 ◽  
Vol 93 (6) ◽  
pp. 1308-1310 ◽  
Author(s):  
Alfred A. Kraus
Keyword(s):  
Gamma Radiation ◽  
Proton Bombardment

Gamma-Radiation from Proton Bombardment of Carbon

1938 ◽  
Vol 53 (10) ◽  
pp. 844-845 ◽  
Author(s):  
M. E. Rose
Keyword(s):  
Gamma Radiation ◽  
Proton Bombardment

scholarly journals Gamma-Radiation from Light Nuclei under Proton Bombardment

1949 ◽  
Vol 76 (2) ◽  
pp. 314-315 ◽  
Author(s):  
W. A. Fowler ◽  
C. C. Lauritsen
Keyword(s):  
Gamma Radiation ◽  
Light Nuclei ◽  
Proton Bombardment

Effects of sterilization modes on the mechanical strengths of plaster of paris implants

1989 ◽  
Vol 47 ◽  
pp. 890-891
Author(s):  
K. Cowden ◽  
B. Giammara ◽  
T. Devine ◽  
J. Hanker
Keyword(s):  
Gamma Radiation ◽  
Calcium Sulfate ◽  
Significant Loss ◽  
Potassium Sulfate ◽  
Limiting Factors ◽  
Radiation Sterilization ◽  
Plaster Of Paris ◽  
Hardness Tester ◽  
Dry Heat ◽  
Calcium Sulfate Hemihydrate

Plaster of Paris (calcium sulfate hemihydrate, CaSO4. ½ H2O) has been used as a biomedical implant material since 1892. One of the primary limiting factors of these implants is their mechanical properties. These materials have low compressive and tensile strengths when compared to normal bone. These are important limiting factors where large biomechanical forces exist. Previous work has suggested that sterilization techniques could affect the implant’s strength. A study of plaster of Paris implant mechanical and physical properties to find optimum sterilization techniques therefore, could lead to a significant increase in their application and promise for future use as hard tissue prosthetic materials.USG Medical Grade Calcium Sulfate Hemihydrate Types A, A-1 and B, were sterilized by dry heat and by gamma radiation. Types A and B were additionally sterilized with and without the setting agent potassium sulfate (K2SO4). The plaster mixtures were then moistened with a minimum amount of water and formed into disks (.339 in. diameter x .053 in. deep) in polyethylene molds with a microspatula. After drying, the disks were fractured with a Stokes Hardness Tester. The compressive strengths of the disks were obtained directly from the hardness tester. Values for the maximum tensile strengths σo were then calculated: where (P = applied compression, D = disk diameter, and t = disk thickness). Plaster disks (types A and B) that contained no setting agent showed a significant loss in strength with either dry heat or gamma radiation sterilization. Those that contained potassium sulfate (K2SO4) did not show a significant loss in strength with either sterilization technique. In all comparisons (with and without K2SO4 and with either dry heat or gamma radiation sterilization) the type B plaster had higher compressive and tensile strengths than that of the type A plaster. The type A-1 plaster however, which is specially modified for accelerated setting, was comparable to that of type B with K2SO4 in both compressive and tensile strength (Table 1).

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