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DHS Request for Information
February 11th, 2021
The US Department of Homeland Security has posted a Request for Information Solicitation Number: 70RWMD20R00000015 on Radioisotope Identification Devices (RIIDs) for Securing the Cities. If you have questions about gamma and neutron detectors, please contact us to discuss the options.
- The global standard for scintillation, NaI(Tl) has a very high luminescence (scintillation) efficiency. Thallium-doped Sodium Iodide produces one of the highest signals in a PMT per amount of radiation absorbed
- Saint-Gobain is an acknowledged leader in NaI(Tl) production, with large production capacity, over multiple facilities, spanning decades
- Lanthanum Bromide has been the reference for excellent energy resolution combined with fast emission and good linearity. The FWHM (full width at half maximum) for a 2” diameter by 2” long crystal has been measured at 2.6%
- LaBr3(Ce) has the special ability to separate out NORM (ANSI N42.34-2015 section 6.9/6.9.2)
- Commercialized Production at Saint Gobain Crystals for over 15 years
- Sodium Iodide crystal co-doped with Thallium and Lithium [NaI(Tl+Li)] a.k.a. NaILTM has the ability to detect Gamma radiation and Thermal Neutrons in a single crystal with exceptional PSD
- Affordable dual detector can use the same equipment as Standard NaI.
- NaIL meets neutron requirements of IAW ANSI N42.34-2015
- One of the brightest scintillators known. With most of its emission in the long wavelength part of the spectrum (>500nm), it is well-suited for photodiode readout
| Properties | NaI(Tl) | LaBr | NaIL | CsI(Tl) |
|---|---|---|---|---|
| Energy Resolution (Cs137) | 7.0% | 3.0% | 8.0% | 12.0% |
| Density [g/cm3] | 3.67 | 5.08 | 3.67 | 4.51 |
| Light Yield (photons/keV) | 38 | 63 | 35 | 54 |
| Wavelength of emission max | 415nm | 380nm | 419nm | 550nm |
| Decay time (ns) | 250 | 16 | 240, 1.4 μs 230, 1.1μs |
1000 |
| Radiation Detected | Gamma | Gamma | Gamma & Neutron | Gamma |