Angular Distribution of Multiply Scattered Gamma Radiation from a Plane Isotropic Source

1955 ◽  
Vol 26 (12) ◽  
pp. 1504-1507 ◽  
Author(s):  
Martin J. Berger
Keyword(s):  
Angular Distribution ◽  
Gamma Radiation ◽  
Isotropic Source

Angular Distribution of Photoelectrons from Gamma Radiation of 0.4 and 1.3 Mev

1954 ◽  
Vol 94 (2) ◽  
pp. 498-499 ◽  
Author(s):  
Arne Hedgran ◽  
Sölve Hultberg
Keyword(s):  
Angular Distribution ◽  
Gamma Radiation

scholarly journals Open water camouflage via ‘leaky’ light guides in the midwater squid Galiteuthis

2016 ◽  
Vol 13 (119) ◽  
pp. 20160230 ◽  
Author(s):  
Amanda L. Holt ◽  
Alison M. Sweeney
Keyword(s):  
Angular Distribution ◽  
Open Water ◽  
Light Environment ◽  
Cross Sectional ◽  
Isotropic Source ◽  
Vertical Range ◽  
Light Guides

Galiteuthis , a midwater squid, has photophores on the ventral surfaces of its eyes. These photophores emit bioluminescence to counter-illuminate the shadows cast by the eyes in downwelling sunlight, thereby hiding the eyes from upward-looking predators. The photophores consist of laminated fibre-like cells with semi-coaxial protein-dense layers around axial cytoplasm. These cells have been suggested to function as light guides: bioluminescence is an isotropic process used to hide in an anisotropic light environment, so any emission must be reshaped to be effective. We found a wide variation in cross-sectional geometries of photophore cells; some were more efficient at light guiding than others. We used a set of optical models to place these photophores in the context of the radiance where Galiteuthis lives and discovered a possible adaptive reason for this variation. In Galiteuthis 's horizontal and vertical range, ocean radiance is also quite variable. For complete camouflage, photophores must reproduce this variation in radiance using an isotropic source. Our models show that variation in the geometry of the photophore light guides reproduces the predicted variation in ocean radiance experienced by this species. By selectively activating geometrically distinct populations of photophore cells, the animal may reproduce the angular distribution of light at all positions in its habitat.

Investigation of the spectral and angular distribution of gamma radiation of ultrarelativistic electrons in crystals

1991 ◽  
Vol 34 (6) ◽  
pp. 515-521
Author(s):  
P. S. Anan'in ◽  
M. Yu. Andreyashkin ◽  
V. N. Zabaev ◽  
A. P. Kashirin ◽  
O. V. Ksendzova ◽  
...  
Keyword(s):  
Angular Distribution ◽  
Gamma Radiation

Anisotropic angular distribution of gamma radiation emitted by a source containing aligned Co nuclei

Physica ◽  
1952 ◽  
Vol 18 (2) ◽  
pp. 1235-1240 ◽  
Author(s):  
O POPPEMA ◽  
J BEUN ◽  
M STEENLAND ◽  
C GORTER
Keyword(s):  
Angular Distribution ◽  
Gamma Radiation

THE LOW LEVELS OF Si29

1957 ◽  
Vol 35 (9) ◽  
pp. 1042-1056 ◽  
Author(s):  
D. A. Bromley ◽  
H. E. Gove ◽  
A. E. Litherland ◽  
E. Almqvist ◽  
E. B. Paul
Keyword(s):  
Angular Distribution ◽  
Gamma Radiation ◽  
Inelastic Scattering ◽  
Energy Range ◽  
Proton Energy ◽  
Branching Ratio ◽  
Decay Angular Distribution ◽  
Low Levels

Information on the low levels in Si29 has been obtained by studying the gamma radiation associated with the Si29(p, p′γ)Si29 inelastic-scattering reaction in the proton-energy range from 2.5 to 3.0 Mev. and with the Al29(β−)Si29 negatron decay. Angular-distribution measurements have shown that the 2.03 Mev. level in Si29 has spin 5/2, and are consistent with a 3/2 assignment to the 1.28 Mev. level. The E2/M1E2 branching ratio for the de-excitation of the 2.03 Mev. state has been measured to be approximately 100. Log ft values of < 5.2, > 6.5, and 5.2 have been determined for the branches of the Al29 decay to the 2.43, 2.03, and 1.28 Mev. states in Si29.

scholarly journals Ground Roughness Effects on the Energy and Angular Distribution of Gamma Radiation from Fallout

1965 ◽  
Vol 11 (6) ◽  
pp. 537-548 ◽  
Author(s):  
C. M. Huddleston ◽  
Q. G. Klingler ◽  
Z. G. Burson ◽  
R. M. Kinkaid
Keyword(s):  
Angular Distribution ◽  
Gamma Radiation ◽  
Roughness Effects

Anisotropic angular distribution of gamma radiation emitted by a source containing aligned 60Co nuclei

Physica ◽  
1952 ◽  
Vol 18 (12) ◽  
pp. 1235-1240
Author(s):  
O.J. Poppema ◽  
J.A. Beun ◽  
M.J. Steenland ◽  
C.J. Gorter
Keyword(s):  
Angular Distribution ◽  
Gamma Radiation

scholarly journals Numerical calculations for the angular distribution of gamma radiation emitted by oriented 58Co NUCLEI

Physica ◽  
1953 ◽  
Vol 19 (1-12) ◽  
pp. 1119-1122 ◽  
Author(s):  
J.A.M. Cox ◽  
S.R. de Groot ◽  
Chr.D. Hartogh
Keyword(s):  
Angular Distribution ◽  
Gamma Radiation ◽  
Numerical Calculations
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