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      1. Home
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      3. DHS Request for Information

      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.

      NaI(Tl) 
      • 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
      LaBr3(Ce)
      • 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
      NaIL
      • 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
      CsI(Tl)
      • 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

       

       

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