Products

Nukalert

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.
About this product :

• 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
• 10 Year Warranty
• Made in the U.S.A.

Specifications :

• Detects Gamma & X-ray radiation: 20 keV to 2+ MeV
• Detection Range: 100 mR/hr to 5,000 R/h
• Sensitivity: 100 mR/hr to 50 R/hr indicated in 10 ranges
• Proportional Increasing Chirp Rate:  50 R/hr to 5,000 R/hr
• Indication: Repeating groups of rapid countable chirps
• Operational indicator: faint "ticking" = operating OK.
• Alarm loudness: ~ 61 dBA (speaking volume)
• Durability: Functional after 6' drop or submersion to 6'
• Battery: Operational Life Expectancy @ room temp:
  - Non-alarming (normal operation) - 10 to 15 years
  - Alarming continuously at single chirp level - 3 years
  - Alarming continuously at highest alarm level - 3 months
  
• Detector: Patented CdS photo resistor coupled to a rare earth phosphor scintillator
• Housing: hermetically sealed, radiation transparent, abrasion resistant ABS plastic
• Accuracy: Within +/- 1 chirp
• Response Time: Dose rate dependent:
• ~3 - 4 min. @100mr/hr
• seconds @ R/hr ranges
• Accumulated dose chart on back
• EMP immunity: Meets MIL-STD-461D, RS105
• Over range survivability: Functional after 5K R/hr. for 2hr.
• Temperature Range: -20 C  to  +50 C 
 

 

 

 

 

CD V-715 Civil Defense High-Range Radiation Detection Survey Meter(0-500 R/hr)

 

 

 

3.25 pounds, die cast aluminum and drawn steel case, watertight, will float. Powered with one D-sized battery, continuously for 150 hours, longer if on intermittent basis.

Instrument accuracy on any of its four ranges is within +- 20% of true dose rate. Accuracy maintained throughout temperature ranges of -20 F to +125 F, relative humidities to 100% and altitudes up to 25,000.

 

 

 

 

CD V-717 Civil Defense High-Range Radiation Detection Survey Meter (0-500 R/hr) 

5.25 pounds, 3-part die cast aluminum case, watertight, will float. Powered with one D-sized battery, continuously for 150 hours, longer if on intermittent basis.

Instrument accuracy on any of its four ranges is within +- 20% of true dose rate. Use of remote cable (25') should not degrade accuracy more than 5%. Detachable bottom section, containing ion chamber, can be set up for remote sensing with included cable.

 

 

 

 

CD V-720 Civil Defense High-Range Radiation Detection Survey Meter     0-500 R/hr 

3.75 pounds, 2-part die cast aluminum case, watertight, will float. Powered with two D-sized batteries, continuously for 150 hours, longer if on intermittent basis.

Instrument accuracy on any of its three ranges is within +- 15% of true dose rate. (It does not have X0.1 range.) Has sliding shield door on bottom to allow detection, though not measurement, of beta particles.

The CD V-720 has some reliability issues and while we will still calibrate a customers meter, we do not sell them here.

 

 

 

The low-range Civil Defense Geiger counter is the CD V-700

The detector on the CD V-700 is a Geiger-Mueller (GM) tube. It measures gamma radiation. It has a check source on the side and a headphone jack. The range selector switch allows you to measure up to 50 mR/hr. A milliroentgen (mR) is one thousandth of a Roentgen (R). The probe on the CD V-700 has a section in the center which rotates to expose a window for also detecting beta. When the window is open it detects both beta and gamma. This survey meter is calibrated only for gamma radiation, so you can not get an accurate reading of the exposure rate from beta particles, only an indication of their presence.

The CD V-700 is a low-range meter more suited for peacetime use than the above three high-range CDV-715's, 717's and 720's.It is only able to measure up to 50 mR/hr and unit may become "saturated" in a higher field of radiation and act erratically, even to the point of giving false low readings in radiation fields exceeding 1000 mR/hr (1 R/hr).

However, it is well suited for verifying successful decontamination and/or checking for low-level contamination in food or water. But, as you'll see in the following section, detailing the most dangerous levels of radiation to be most concerned about, if you can only initially afford one survey meter, it needs to be a high-range meter first

 

 

Dosimeters and Chargers

The direct-reading pocket dosimeter is a portable instrument designed to measure the total dose of moderate and high levels of gamma radiation. The common dosimeters are designated the CD V-138, CD V-730, CD V-740, and CD V-742. The instruments make use of a small quartz fiber electoscope as an exposure detector and indicator. An image of the fiber is projected onto a film scale and viewed through the eyepiece lens. The scale is calibrated in milliroentgens (mR) or roentgens (R), depending on the model, and may be read by looking through the eyepiece toward a lamp or other source of light. A CD V-750 or 756 dosimeter charger must be used in conjunction with the dosimeter to set the instrument to zero. The charger may also be used to read the scale.

The "Operating and Maintenance Instructions", that come with each CD V-750/756 charger, explains how to zero your dosimeter with the charger. However, something we hadn't seen addressed in them, is that the fiber image may shift slightly when the dosimeter is removed from the charger. This hairline "kick" is a common occurrence, particularly on the lower-range dosimeters. Simply repeat the charging procedure until a zero reading is obtained. If this is difficult, a poor ground condition at the charging pedestal is likely. This condition may be more pronounced if the charger has not been used for a period of time

Dosimeters can be defective, too, like any instrument. Electrical leakage in dosimeters creates movement or drift of the fiber from an initial setting OR towards an up-scale reading without the presence of radiation. There can be half-a-dozen reasons why, but typically it is caused by contaminates in the manufacturing process, outgassing of internal components, such as plastics, or broken hermetic seals allowing humidity intrusion. FEMA current requirements for field dosimeters is for electrical leakage to not exceed 5% of full scale for a 50 degree C five day test. (Maximum leakage limit is 1% of full scale per day.) The test procedure requirements are quite a bit more involved than just slow cooking them for five days, but that's the primary objective to encourage failure in any units prone to these problems. Any dosimeters failing to meet this standard are considered defective and should be repaired.