Gamma detectors

Radioactive events occur in the measured depth interval (8,100-8,200 ft) with no displacement of the low/high side gamma ray logs. The radioactive events must be perpendicular to the gamma detector and could be indications of vertical natural fractures in the formation. 

The inelastic scattered gammas from nitrogen are very weak and hard to detect in the detector pulse continuum. With low-energy resolution gamma detectors... 

GENERAL PURPOSE LOW LEVEL BETA-GAMMA DETECTOR... 

In-line detection. In the treatment of solutions containing americium the americium 241 content of solutions leaving the chromatography columns is continuously monitored. The gamma detector is a miniature Geiger-Muller tube placed in contact with the solution outlet pipe. The unit is shielded from ambient irradiation by lead. 

EDTA which cloggs filters and, sometimes, even the columns. The feed pump is actuated by the signal of the gamma detector placed near the waste outlet pipe. This allows continuous feed of the active solution without the risk of polluting the waste with americium 241. On the POX. 11 column packed with 9 kg of stationary phase, one cycle served to extract 15.2 g of americium 241 present initially in 685 L of solution. The americium 241 concentration factor was 34, and the americium 241 waste decontamination factor was 250. The americium eluate contained only very small amounts of Fe and Cd. Decontamination factor of Am from Fe and Cd were 130 and 140, respectively. 

Whereas most magnetic-transport beams are a few m long in order to shield the annihilation gamma detector from the source, this length is notrequired if we are interested in particle spectroscopies, especially if electrostatic transport and focusing is incorporated into the design. Canter [45] has published several papers on positron optics to which the reader is referred. Figure 3.13 shows an example from the author s laboratory. 

Canberra well-type HPGe gamma detector for determination of Sr Liquid scintillation counter (Wallac 1220) for determination of... 

Contaminated air from the cyclotron is exhausted to the outside atmosphere after passing through a HEPA filter and carbon filters. A stack monitor consisting of a gamma detector is installed to constantly monitor the level of radioactivity exhausted to meet the regulatory limits. 

C. Description and Use. Each individual will be issued a DT236/PDR-75 dosimeter. This device, worn on the wrist, contains a neutron diode and a phosphate glass gamma detector. When a determination of exposure is required, the dosimeter is inserted into a CP-696/PDR-75 reader, which then displays the cumulative neutron and gamma dose. 

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