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Adelphi Technology Inc.
2003 E. Bayshore Road
Redwood City, CA 94063

Tel: +1 (650) 474 2750
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DD110M and DD109M

The new, revolutionary DD110M and DD109M are compact, high yield fast-neutron generators that have an integrated moderators that quickly thermalizes these fast neutrons, resulting in a high thermal neutron fluxes. The generator and moderator are in the same compact housing that can be wheeled around to different experiments or facilities. The thermal neutrons can be directed to output ports, sample chambers or beam collimators. These generators are revolutionary in that they produce thermal fluxes that are comparable to those obtained from research reactors and national neutron facilities, thus opening up to small laboratories the possibility of applications here-to-fore were reserved for the larger, more expensive facilities. These generators are well suited to materials analysis, radiography, and the teaching of nuclear physics.

delayed gamma ray spectrum

Image of the delayed gamma ray spectrum from an activated soil sample

Materials Identification
Moderating to thermal energies permits activation of many isotopes and makes the generator useful for materials analysis and identification. The generator has a high thermal neutron flux and so is a good source for Neutron Activation Analysis (NAA) and Prompt Gamma Neutron Activation Analysis (PGNAA). This moderated source closely mimics experimental research reactors, which have previously been the primary sources of thermal neutrons that can be used for NAA and PGNAA. Furthermore, the source can be pulsed or gated to minimize the noise background. This can be helpful for delayed neutron activation analysis.

Teaching Nuclear Physics
Imagine having a safe, compact nuclear reactor for classroom demonstrations, experiments and research. This desired system would not be the size of a large two story building, cost millions of dollars, require special government licensing and would require Uranium fuel and would produce waste. In these generators, the only ‘fuel’ used is deuterium, readily available from most scientific gas suppliers. These deuterium based generators require no licensing for either export or operation. Shielding can be purchased that fits precisely around the generator and is removable to allow access to the experimental sample chamber. If you are using it to activate samples, you may wish to purchase a compressed air "Rabbit" system that can deliver a small sample to a location within the shielding. This “Rabbit” system is rather like the compressed air Pneumatic Tube Transport systems (also called PTT, airlift, Lamson tubes or air tubes) that are used in shops and banks to transfer cash to a safe location. Such a system can be used to limit access to the neutron generator itself whilst providing access for students and technicians.

General Specifications
DD110M yield 1 x 1010 neutrons/sec
DD110M thermal flux 1 x 107 neutrons/cm2/sec
DD109M yield 2 x 109 neutrons/sec
DD109M thermal flux 2 x 106 neutrons/cm2/sec
Neutron Energy Thermalized from 2.5 MeV
Simple scheduled maintenance ≥ 2000 hrs, replacement of some internal parts
Standard operating mode Continuous
Pulse on demand (option) ≥ 50 µS, to 100% duty factor

The generator is computer controlled via a graphical user interface and has a series of hardware safety interlocks for the protection of personnel and the generator itself. The generator requires two or three phase electrical power and we can typically work with customers to provide a unit that will work with the voltage and frequency levels available in your jurisdiction. The DD generators have easily replaceable subcomponents that can be installed in the field by customers or Adelphi Technicians. The generators have a controllable output level. If the pulsed generator option is chosen, a user supplied TTL voltage level (such as from a signal generator) can be used to switch on the generator. When the TTL level is asserted, the generator turns on to the selected output level, which is any yield up to it’s maximum output level, which for the DD110M is 1x1010 neutrons/sec.

» See Technical Brochure: DD110M