Gamma-ray spectrometer calibration for field analysis of thorium, uranium and potassium

1970 ◽  
Vol 7 (4) ◽  
pp. 1093-1098 ◽  
Author(s):  
P. G. Killeen ◽  
C. M. Carmichael
Keyword(s):  
Regression Analysis ◽  
Gamma Ray ◽  
Laboratory Analysis ◽  
In Situ Analysis ◽  
Field Analysis ◽  
Gamma Ray Spectrometer ◽  
Nonlinear Relation ◽  
Using Data ◽  
Spectrometer Calibration

The calibration of a portable three-channel gamma-ray spectrometer for in situ analysis of thorium, uranium, and potassium is discussed. A method of regression analysis is suggested as the best means of including all of the data available from the calibration stations. Calibration indicates a nonlinear relation between count rates obtained in the field and concentrations in parts per million obtained from laboratory analysis. The range of radioelement content must be taken into consideration and appropriate sets of calibration constants applied. As an example of the method, calibration constants are calculated for a portable gamma-ray spectrometer using data for the Blind River uranium region of Ontario.

THE NATURAL GAMMA‐RAY FLUX: IN‐SITU ANALYSIS

Geophysics ◽  
1968 ◽  
Vol 33 (2) ◽  
pp. 311-328 ◽  
Author(s):  
Ronald Doig
Keyword(s):  
Gamma Ray ◽  
Background Radiation ◽  
In Situ Analysis ◽  
Rock Outcrops ◽  
Large Sample ◽  
Gamma Ray Spectrometer ◽  
Natural Gamma ◽  
Major Project ◽  
Quantitative Evaluations

A fully portable transistorized gamma‐ray spectrometer has been constructed, and used to investigate the nature of the gamma ray activity at the surface of rock outcrops. Gamma‐ray photopeaks of [Formula: see text] and members of the U and Th series have been identified, along with strong fallout activity dominated by the 0.75 Mev activity of [Formula: see text]. A method has been devised for measuring, in situ, the K, U, and Th contents of rocks. Calibration accounts for the interference between the radioelements, and for background radiation. The following estimates of accuracy and sensitivity are for five‐minute counting intervals: 5 percent plus 0.1 percent K, 10 percent plus 0.2 ppm U, 10 percent plus 0.5 ppm Th. The main advantages of the method are its speed and versatility and the very large sample analyzed. A number of surveys have been performed to demonstrate some of the applications of the instrument. The major project of this series is detailed mapping of the K, U, and Th distribution in the Preissac granite of northwestern Quebec. In addition to its use as a petrologic tool, the technique is eminently suited to prospecting for U and Th, and the quantitative evaluations of occurrence of these elements.

Comet nucleus gamma-ray spectrometer penetrator - An in situ nucleuscomposition experiment

1985 ◽  
Author(s):  
B. SWENSON ◽  
A. MASCY ◽  
L. EDSINGER ◽  
S. SQUYRES ◽  
C.P. MCKAY
Keyword(s):  
Gamma Ray ◽  
Comet Nucleus ◽  
Gamma Ray Spectrometer

the TASTE mission: In situ DEIMOS terrain analyzer with smalls and miniturized lander

2021 ◽  
Author(s):  
Michelle Lavagna ◽  
John Brucato ◽  
Jacopo Prinetto ◽  
Andrea Capannolo ◽  
Michele Bechini ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Surface Composition ◽  
Landing Site ◽  
Organic Content ◽  
Elemental Abundance ◽  
Origin And Evolution ◽  
Gamma Ray Spectrometer ◽  
Close Orbit ◽  
Science Operations

<p>Deimos and Phobos are considered primary targets of investigation to understand the origin and evolution of Mars and more in general the terrestrial planets of the Solar System. </p> <p>TASTE mission aims complementing MMX investigation by focusing on Deimos surface, combining both <strong>global remote sensing</strong> observations from a close orbit and<strong> direct in-situ analyses</strong> of the surface thanks to a lander release on Deimos. With a synergy between orbital and in-situ investigations, the proposed mission will contribute to the Deimos global morphology understanding; its global elemental abundance; landing site morphology and texture; landing site organic content and surface composition. TASTE is conceived as a Cubesat-in-Cubesat mission: a 12U space asset composed by a <strong>9U orbiter </strong>and a<strong> 3U lander</strong>. The former embarks an <strong>X-gamma ray spectrometer</strong> developed by OAT and a multispectral camera, the second is equipped with a  <strong>miniaturized Surface Sample Analyser</strong> (SSA), composed by a new Sample Acquisition Mechanism (SAM), conceived by PoliMi and a Surface Analytical Laboratory (SAL)  developed by INAF OAA. <br />The mission is conceived to keep the orbiter on a QSO nearby Deimos to facilitate the lander release and the scientific operations in synergy with the lander itself. Details on science, space assets sizing and design and mission science operations will be discussed in deep. </p>

The MESSENGER Gamma-Ray Spectrometer: Calibration and operations

Icarus ◽  
2017 ◽  
Vol 288 ◽  
pp. 186-200 ◽  
Author(s):  
Larry G. Evans ◽  
Patrick N. Peplowski ◽  
Edgar A. Rhodes ◽  
John O. Goldsten ◽  
Richard D. Starr ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Spectrometer ◽  
Spectrometer Calibration
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