Gamma ray intensity

Radioactive isotopes, determination by gamma-ray intensity measurements, 292... 

This expression tells us that the gamma-ray intensity reduces in accordance with the decimal notation. For example, at twice and three times as large a shield thickness as TVT, the gamma-ray intensity reduces to 1/100 and 1/1000 of the incident intensity, respectively. 

FIGURE 2.65 The gamma rays intensity dependence of the thickness of shielding material. (Reprinted from Yu. Potapov, Yu. Borisov, V. Chmyhv, and D. Beilin, Research of Polymer Concrete Based on Low Molecular Polybutadiene, Part VIII Chemical Resistance of Polymer Concrete, J. Scientific Israel Technological Advantages 7, nos. 1-2 (2005) 72-78. With permission.)... 

When water is used as the carrier fluid, it is more convenient to express the gamma-ray intensity, Z, in relation to the intensity recorded for clear water, Iw, in the same system. This relationship is... 

Some interpretation may be required to obtain parameters of interest from the values reported in compilations. Gamma-ray intensities may be given in fractions that can be used directly, or relative to a selected—usually the most intense— reference gamma-ray intensity set at a value of 100. In the latter case, all other gamma-ray intensities must be calculated by multiplying the given intensity of the reference gamma ray by the appropriate fraction. 

Gamma-ray intensities from the (p,p ) reaction correspond to the direct level population ... 

W, 5 kW, 50 kW, and 2 MW. (At full reactor power of 2 the gamma ray intensity has been experimentally determined to be 40 Gy/s.) The lowest power steps (0 and 50 W) could provide information on the resistance changes that might be expected in insulation at radiation dose rates at the magnet in an operating fusion reactor mGy/s). 

A foil irradiation method was evaluated for its ability to verify the neutron energy spectrum in the assembly. In thb method a spectral index was measured using indium foil. The spectral index was the ratio of the rate of the " In(n, y) reaction (sensitive to low-energy neutrons) to the rate of the In(n, n ) reaction (sensitive to high-energy neutrons). The ratio of the gamma-ray intensities from the products of these reactions comprise the experimental data. This spectral index was able to detect the presence of a 0.64-cm-thick, S.D8-cm-high polyethylene column 10 to 15 cm away from the indium foil. 

It is generally recognized that the gamma-ray intensity emanating from a source falls off with distance according... 

At constant source-to-detector distance, distributing radioactive material within a volume of material, as opposed to concentrating it in a point source, must decrease the gamma-ray intensity at the detector. Figure 7.10 compares... 

Having measured the correction factors as described above, it is then necessary to correct gamma-ray intensities for TCS, combining results for different gamma-rays... 

ATTENUATION COEFFICIENT The proportion of gamma-ray intensity lost from a beam by passing through an absorbing medium. This takes into account scattering out of the beam and... 

The entire inner reactor shield was improved to permit higher power operation with a low neutron leakage and also to increase the neutrou-to-gamma-ray intensity in the thermal columns. Cadmium was replaced by B4C paraflin and additional steel shielding was added. 

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