The SS404 Al is a thin-crystal NaI(Tl) end-window scintillation probe designed to be an equivalent to the Mini 44A.

This probe incorporates a ∅ 1.3" x 0.1" (32 x 2.5 mm) thick NaI(Tl) crystal mounted on an aluminium window and is fitted with an internal 0.1" (3.15 mm) lead collimator to reduce background counts.


The SS404 Be is similar to the SS404 Al but is fitted with a beryllium window, which extends the low energy response down to 5 keV, making it suitable for counting 55Fe.

Operating Voltage Typically 650 V
Detector Crystal ∅ 1" x 0.1" (32 x 2.5 mm) NaI
Energy Response

Al= 15 keV - 250 keV
Be= 5 keV - 250 keV
Housing Detector MHV
Dimensions ∅ 2" x 7" (54 x 185 mm)
Weight 29 oz (820 g)
Temperature -10°C to + 50°C

Listed as percentage of 2π emission rate

Nuclide Energy SS404 Al Efficiency SS404 Be Efficiency
Fe-55 5.9 keV 6.10% 31.40%
Pu-238 16.3 keV 98.70% 99.10%
I-129 31.5 keV 84.90% 91.50%
Am-241 58.8 keV 117.00% 117.30%
Co-57 120 keV 82.70% 83.00%
Cs-137 662 keV 17.00% 18.30%
Co-60 1200 keV 11.40% 12.40%

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