This extremely sensitive device detects gamma rays emitted by the human body. Most of the natural signal coming from the human body is from an isotope of potassium (K).
Click
on the images to advance
Overview of Measurement Techniques
| Whole
Body Gamma Counter (WBC) - 40K
This extremely sensitive device detects gamma rays emitted by the human body. Most of the natural signal coming from the human body is from an isotope of potassium (K). |
Click
on the images to advance |
 |
In
Vivo Neutron Activation Analysis (IVNAA)
This technique uses neutrons to stimulate production of gammas from certain elements. The gammas are subsequently measured by the whole body counter. |
| Dual-Energy
X-ray Absorptiometry (DXA)
A precisely controlled x-ray beam scans an entire body for determination of bone mineral content, body fat, and lean tissue mass. Localized scanning focuses on spine, hip, and other bone sites. |
 |
 |
Bioelectrical
Impedance Analysis (BIA) The resistance to an applied electric current flowing through the body is related to the volumes of conductive tissues that the current passes through. This measurement can estimate water and fat ratios. |
|
Densitometry |
 |
|
USDA/ARS
Children's Nutrition Research Center |
|