Simple theory concerning the emission efficiency and energy deposition of electrons produced in a slab exposed to 1.25 MeV gamma rays

1975 ◽  
Vol 131 (1) ◽  
pp. 157-161 ◽  
Author(s):  
Susumu Minato
Keyword(s):  
Gamma Rays ◽  
Energy Deposition ◽  
Simple Theory ◽  
Emission Efficiency

scholarly journals Geometrical Parametrization of Piezoelectric Sensors for Acoustical Monitoring in Hadrontherapy

Proceedings ◽  
2019 ◽  
Vol 42 (1) ◽  
pp. 73
Author(s):  
Jorge Otero ◽  
Ivan Felis
Keyword(s):  
Gamma Rays ◽  
Energy Deposition ◽  
Piezoelectric Sensors ◽  
Surrounding Tissue ◽  
Signal Frequency ◽  
Heavy Particles ◽  
Numerical Studies ◽  
Acoustic Technologies ◽  
Acoustical Monitoring ◽  
Hadron Beam

Hadrontherapy has been constantly evolving in leaps and bounds since the 1950s, when the use of heavy particles was proposed as an alternative treatment to radiotherapy with gamma rays or electrons. The main objective of this treatment is to maximize the dose applied to the tumour, avoiding damage to the surrounding tissue. One of the keys to the success of hadrontherapy is to achieve instantaneous monitoring of the energy deposition in the environment. Since energy deposition leads to the generation of a thermoacoustic pulse, acoustic technologies have been tested with successful results. However, for this purpose, it is essential to increase the sensitivity of the sensors for the acoustical signal and, therefore, to optimize their geometry as a function of the beam that would be used. We have studied a PTZ material in volumetric and surface volumes through experimental measures and FEM methods. In this text, we start with numerical studies which determine the dependence of the thermoacoustic signal frequency with the energy and duration of the hadron beam.

Energy deposition of gamma rays in LSO crystal

2010 ◽  
Vol 22 (6) ◽  
pp. 1351-1354 ◽  
Author(s):  
朱金辉 Zhu Jinhui ◽  
牛胜利 Niu shengli ◽  
马继明 Ma Jiming ◽  
赵军 Zhao Jun ◽  
黄流兴 Huang Liuxin
Keyword(s):  
Gamma Rays ◽  
Energy Deposition

Impact of Coherent Scattering on the Spectra and Energy Deposition of Gamma Rays in Bulk Media

1989 ◽  
Vol 101 (4) ◽  
pp. 352-370 ◽  
Author(s):  
K. V. Subbaiah ◽  
A. Natarajan ◽  
D. V. Gopinath
Keyword(s):  
Gamma Rays ◽  
Energy Deposition ◽  
Coherent Scattering

On the possible gamma-ray source in Cygnus

1967 ◽  
Vol 31 ◽  
pp. 469-471
Author(s):  
J. G. Duthie ◽  
M. P. Savedoff ◽  
R. Cobb
Keyword(s):  
Gamma Rays ◽  
Gamma Ray ◽  
Right Ascension

A source of gamma rays has been found at right ascension 20h15m, declination +35°, with an uncertainty of 6° in each coordinate. Its flux is (1·5 ± 0·8) x 10-4photons cm-2sec-1at 100 MeV. Possible identifications are reviewed, but no conclusion is reached. The mechanism producing the radiation is also uncertain.

Solar Flare Energetic Neutral Emission Measurements in the Project Coronas-I

1994 ◽  
Vol 144 ◽  
pp. 635-639
Author(s):  
J. Baláž ◽  
A. V. Dmitriev ◽  
M. A. Kovalevskaya ◽  
K. Kudela ◽  
S. N. Kuznetsov ◽  
...  
Keyword(s):  
Solar Flare ◽  
Energy Range ◽  
Gamma Rays ◽  
Pulse Shape ◽  
Gamma Ray ◽  
Pulse Shape Discrimination ◽  
Shape Discrimination ◽  
Solar Neutron ◽  
Low Altitude

AbstractThe experiment SONG (SOlar Neutron and Gamma rays) for the low altitude satellite CORONAS-I is described. The instrument is capable to provide gamma-ray line and continuum detection in the energy range 0.1 – 100 MeV as well as detection of neutrons with energies above 30 MeV. As a by-product, the electrons in the range 11 – 108 MeV will be measured too. The pulse shape discrimination technique (PSD) is used.

Ovarian Dysfunction in Fetally Irradiated Beagles

1977 ◽  
Vol 35 ◽  
pp. 658-659
Author(s):  
T. M. Seed ◽  
M. H. Sanderson ◽  
D. L. Gutzeit ◽  
T. E. Fritz ◽  
D. V. Tolle ◽  
...  
Keyword(s):  
Gamma Rays ◽  
Low Dose ◽  
Long Term Effects ◽  
Ovarian Dysfunction ◽  
Dose Rates ◽  
Highly Sensitive ◽  
Microscopic Evaluation ◽  
Ovarian Pathology ◽  
Normal Offspring

The developing mammalian fetus is thought to be highly sensitive to ionizing radiation. However, dose, dose-rate relationships are not well established, especially the long term effects of protracted, low-dose exposure. A previous report (1) has indicated that bred beagle bitches exposed to daily doses of 5 to 35 R 60Co gamma rays throughout gestation can produce viable, seemingly normal offspring. Puppies irradiated in utero are distinguishable from controls only by their smaller size, dental abnormalities, and, in adulthood, by their inability to bear young.We report here our preliminary microscopic evaluation of ovarian pathology in young pups continuously irradiated throughout gestation at daily (22 h/day) dose rates of either 0.4, 1.0, 2.5, or 5.0 R/day of gamma rays from an attenuated 60Co source. Pups from non-irradiated bitches served as controls. Experimental animals were evaluated clinically and hematologically (control + 5.0 R/day pups) at regular intervals.

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