• Model 901

The Model 901 Key Chain Radiation Detector for Upper-Range Radiation is an effective and easy to use system for detecting dangerous levels of radiation.

More than just a radiation detector, the NukAlert™ is a patented personal radiation meter, monitor and alarm. Small enough to attach to a key chain, the device operates non-stop, 24/7 and will promptly warn you of the presence of unseen, but acutely dangerous levels of radiation.

Used nationwide by federal, state and local first responders, law enforcement and the Dept. of Defense, the device is the ideal solution for increasing individual security and awareness of radiological threats. It will be very reassuring to know, with confidence, when you and your family are out of the worst danger.



  • Tested & Verified by Naval Air Warfare Center
  • Always "ON" 24/7, Includes long-life 10+ year battery
  • Detection Range: 100 mR/hr to 5,000 R/hr,
  • Metering: 100 mR/hr to 50 R/hr, in 10 calibrated ranges
  • Proportional Increasing Chirp Rate: 50 R/hr to 5,000 R/hr
  • Gamma and X-rays from 20 keV to above 2 MeV
  • Sensitivity incl. higher emergency radiation levels
  • Alarm "chirp" corresponds to chart on back of device
  • Introduced before Health Physics Society - 1/03
  • Performance verified by Nat'l Radiological Laboratory
  • Each unit individually radiation accuracy tested
  • Patented technology
  • Made in the U.S.A.

Why Berkeley Nucleonics ?

We provide live online consulting at live-help, we stock these units, and we build it into a program with our Isotope Identifiers, Personal Radiation Detectors and Training Programs. BNC as been around since 1963 providing radiation detection products for First Responders, Hazmat Units, Military, etc.


Detects Gamma & X-ray Radiation20 keV to 2+ MeV
Detection Range100 mR/hr to 5,000 R/hr
Sensitivity100 mR/hr to 50 R/hr indicated in 10 ranges
Proportional Increasing Chirp Rate50 R/hr to 5,000 R/hr
IndicationRepeating groups of rapid countable chirps
Operational IndicatorFaint "ticking"= operating OK
Alarm Loudness61 dBA (speaking volume)
DurabilityFunctional after 6' drop or submersion to 6'
BatteryOperational Life Expectancy @ room temp Non-alarming (normal operation)- 10 to 15 years Alarming continuously at single shirp level - 3 year Alarming continuously at highest alarm level - 3 months See NEW Battery Replacement Program
DetectorPatented CdS photo resistor coupled to a rare earth phosphor scintillator
HousingHermetically sealed, radiation transparent, abrasion resistant ABS plastic
AccuracyWithin /- 1 chirp
Response TimeDoes rate dependant ~3-4 min. @ 100mr/hr seconds @ R/hr ranges
Accumulated Dose Chart on BackEMP Immunity Meets MIL-STD-461D, RS 105
Over Range SurvivabilityFunctional after 5K R/hr for 2 hr
Temperature Range-20C to +50C
Physical1.75"x1.25"x.75"H (LxWxH), Wt <1.0 oz

Technical resources

PDF icon 901-manual.pdf86.18 KB

Price information

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