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SENSITIVITY:
Gamma:
Will detect 1,000g of 235U (HEU) or 10g of 239Pu, 50% probability of detection, 95% confidence in a 20 uR/hr background at a passage speed of 5 mph (8km/h) when tested in accordance with ASTM International Standard C 1169
Neutron:
Will detect less than 200g of plutonium in a shielded container that reduces the gamma flux to 1% of the unshielded gamma flux
Refer to Los Alamos publication number LA-13247-MS*, April 1997, "An Update for the Applications Guide to Vehicle SNM Monitors".
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DETECTORS:
VM-250A:
Two, 30"h x 6"w x 1.5"d (76 x 15 x 3.8cm) organic plastic scintillator detectors per pillar; provides approximately 1,080 in3 (17.6 liters) of detector volume per pillar
VM-250AGN:
Two, 30"h x 6"w x 1.5"d (76 x 15 x 3.8cm) organic plastic scintillator detectors per pillar and four, 2" diameter x 36" (5 x 91cm) 3He tubes per pillar; provides approximately 1,080 in3 (17.6 liters) of detector volume per pillar
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FALSE ALARM RATE:
Typically less than 1 in 1,000 passages
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ALARM INDICATION:
Alarms are indicated by a red strobe light mounted on the master pillar. High and low faults along with other fault conditions are indicated by an amber light. Neutron alarm is indicated by a blue strobe light.
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DISPLAY:
Alphanumeric LCD, 4 lines x 16 characters
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COMMUNICATIONS:
Both models are equipped with RS-232 and Ethernet communications capability.
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DATA STORAGE:
256k bytes of flash memory is used to store average hourly background data and alarm data. Under normal conditions the memory should be adequate to store data for at least 3 months of operation.
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POWER REQUIREMENTS:
90 - 250 Vac, 47 - 63 Hz, less than 100 VA
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BATTERY LIFE:
Greater than 24 hours of normal operation
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DIMENSIONS:
VM-250A:
120"h x 10"w x 10"d (305 x 25 x 25cm) per pillar
VM-250AGN:
120"h x 26"w x 8"d (305 x 66 x 20cm) per pillar
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WEIGHT:
VM-250A:
~300 lb (136kg) per pillar
VM-250AGN:
~600 lb (273kg) per pillar
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ENVIRONMENTAL:
-30° to 122°F (-34° to 50°C) Designed for outdoor use in most climates. For extreme conditions, optional heating/cooling is available.
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OPTIONAL COMPONENTS:
Heaters and Insulation, AM-270
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*The Los Alamos publication number LA-13247-MS*, April 1997, "An Update for the Applications Guide to Vehicle SNM Monitors" is available to DOE and DOE contractors from the Office of Scientific and Technical Information, P.O. Box 62, Oak Ridge, TN 37831, (423) 576-8401. It is available to the public from the National Technical Information Service, US Department of Commerce, 5285 Port Royal Road, Springfield, VA 22616.
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