Macro Logo

Enabling Technology

KD14 module
Fig 1. KD14 module
Passive gamma scanners need many detectors to achieve high speed and good sensitivity. The outputs of all the detectors are combined to produce a single profile of 235U gamma rays along the length of the fuel rod. Compact Detector Assembly
Fig 2. Compact Detector Assembly
Old Technology Scanner Detector assembly
Fig 3. Old Technology Detector Assembly
Our old (c. 2003) technology detector assemblies (Fig 3) and Electronics (Fig 5) were separate and needed to be connected by coaxial cables. This made assembling a large number of detectors impractical and expensive.

In order to make large array passive gamma scanners that would be competitive with Active Scanner and yet fit on the factory floor and not overwhelm the maintenance staff, Macro developed miniature nuclear electronics modules (Fig 1) and Compact Detector Assemblies (Fig 2).

Figure 3 and 5 together show the hardware and cables needed for a passive gamma scanner with 10 detectors.  In comparison, Figure 4 shows a complete passive gamma scanner with 4 detectors and all required processing electronics. For 10 detectors, all that would change in Figure 4 would be that the black detector assembly would be 100 mm (4 in.) wider to accomodate an additional 6 detectors.
Demonstration passive gamma scanner
Fig 4. New technology detector assembly and electronics (demonstration system)
Old Technology Scanner
Fig 5. Old Technology Electronics
Our new technology (Fig 1) is directly evolved from our older technology (Fig 5) which has been in continuous use inspecting nuclear fuel since 2003.