Measurement and Calculation of Energy Deposition Due to Capture Gamma Rays Inside Annuli of Cadmium, Silver and Stainless Steel

1965 ◽  
Vol 22 (4) ◽  
pp. 494-495 ◽  
Author(s):  
A. W. Boyd ◽  
H. W. J. Connor ◽  
S. A. Kushneriuk
Keyword(s):  
Stainless Steel ◽  
Gamma Rays ◽  
Energy Deposition

Evaluation of the uncertainty associated with sample holders in NAA measurements in LAN/IPEN

2019 ◽  
Vol 7 (2A) ◽  
Author(s):  
Guilherme Soares Zahn ◽  
Regina Beck Ticianelli ◽  
Mitiko Saiki ◽  
Frederico Antonio Genezini
Keyword(s):  
Stainless Steel ◽  
Neutron Activation Analysis ◽  
Neutron Activation ◽  
Gamma Rays ◽  
Experimental Error ◽  
Steel Sample ◽  
Low Energy ◽  
Stainless Steel Sample ◽  
Gamma Emission ◽  
Energy Gamma

In IPEN’s Neutron Activation Laboratory (LAN/IPEN), thin stainless steel sample holders are used for gamma spectrometry in NAA measurements. This material is very practical, but its chemical composition may be troublesome, as it presents large amounts of elements with intermediate atomic number, with attenuation factors for low-energy gamma-rays that must not be neglected. In this study, count rates obtained using different sample holders were compared. To accomplish that, an Am-241 source, with 59-keV gamma emission, was used so that low-energy gamma attenuation differences can be determined. Moreover, in order to study the energy dependence of these differences, a Ho-166m source was also used. From these results, it was possible to analyze the experimental error associated to the variations between sample holders, with the aim of introducing an addictive term to the uncertainty analysis of comparative Neutron Activation Analysis results.

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.

Sign in / Sign up

Export Citation Format

Share Document