The SS315 is functionally identical to the SS300, but with a different probe geometry.

Operating Voltage 550 V
Window 2 in2 (15.5 cm2) 1.6 to 2.0 mg/cm2 mica
Measurement Range 0 - 5 kcps
Plateau Length 150 V
Temperature Range -10°C to + 50°C
Energy Response 20 keV - 2 MeV Gamma, ≥ 40 keV Beta, > 3 MeV Alpha
Housing Connector MHV
Dimensions ∅ 3" x 7" (70 x 180 mm)
Active Area 2 in2 (15.5 cm2)
Weight 16 oz (450 g)

Listed as percentage of 2π emission rate

Nuclide Emission Efficiency
Am-241 α 29.10%
Pu-238 α 26.60%
Nat U α 63.50%
Sr-90/Y-90 β 56.70%
C-14 β 19.40%
Pm-147 β 59.10%
Pu-238 β 25.80%
Co-60 β 36.20%
Cs-137 β 50.60%

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SS315 Contamination Probe