Qty:1
Add to Cart
or
Sign in to turn on 1-Click ordering.

Have one to sell? Sell on Amazon

Image Unavailable

Image not available for
Color:
  • Radiation Alert MONITOR4 Analog-Based Ionizing Radiation Detector
  • Sorry, this item is not available in
  • Image not available
  • To view this video download Flash Player
      

Radiation Alert MONITOR4 Analog-Based Ionizing Radiation Detector

| 3 answered questions

List Price: $350.00
Price: $349.99 & FREE Shipping. Details
You Save: $0.01
Only 11 left in stock (more on the way).
Ships from and sold by Amazon.com. Gift-wrap available.
2 new from $349.99

Specifications for this item
Brand Name Radiation Alert
Part Number MONITOR4
Material Type Plastic
Number of Items 1
Import Designation Made in USA
Temperature Range neg 4/131  Degrees Fahrenheit
UNSPSC Code 26142300

The Radiation Alert Monitor 4 is a hand-held radiation detector with an analog display over th... Read full product description




Product Features

  • Radiation detector used to check levels of potentially harmful ionizing particles and rays in the environment and in objects such as particle accelerators, x-ray shielding, and industrial gauges
  • Detects ionizing radiation types such as alpha and beta particles, and gamma rays and x-rays
  • Dual-scale analog meter with needle-point display of counts per minute (CPM) and milliRoentgen (mR) per hour
  • Three selectable operation ranges of X1, X10, and X100 for adjustment when peak mR levels are met
  • Red, flashing counter and a beeping noise indicate each ionizing radiation increase event


Product Details

User Manual [301kb PDF]| Spec Sheet [2.02mb PDF]
  • Shipping Weight: 1 pounds (View shipping rates and policies)
  • Shipping: Currently, item can be shipped only within the U.S.
  • ASIN: B004CCRIJ8
  • Average Customer Review: 4.1 out of 5 stars  See all reviews (15 customer reviews)
  • Amazon Best Sellers Rank: #31,835 in Industrial & Scientific (See Top 100 in Industrial & Scientific)
  •  Would you like to give feedback on images?


Frequently Bought Together

Radiation Alert MONITOR4 Analog-Based Ionizing Radiation Detector + iOSAT Potassium Iodide Tablets, 130 mg (14 Tablets) + Israeli Civilian Gas Mask w/ Nato Filter
Price for all three: $381.68

These items are shipped from and sold by different sellers.

Buy the selected items together

Product Description

The Radiation Alert Monitor 4 is a hand-held radiation detector with an analog display over three selectable operational ranges for detecting potentially harmful ionizing alpha and beta particles, and gamma and x-ray radiation. This meter has a dual-scale, analog, needle-point display of counts per minute (CPM), and milliRoentgen (mR) per hour. It detects the four main types of ionizing radiation: alpha and beta particles, and gamma rays and x-rays. It has three selectable operational ranges (X1, X10, or X100) to be adjusted when the meter face peaks at the highest mR level.

The Monitor 4 has a red, flashing counter and a beeping noise to indicate each ionizing radiation event. It has a halogen-quenched Geiger Mueller (GM) tube with a thin, mica end window for sensing ionizing radiation. It is used to check radiation levels in the environment and objects, such as particle accelerators, x-ray shielding, and industrial gauges. An audio indicator with an internally mounted beeper can be turned off for silent operation. The Monitor 4 cannot be returned.

Specifications

Reading Ranges 0 to 0.5, 0 to 5, or 0 to 50 milliRoentgen (mR) per hour, or 0 to 500, 0 to 5,000, or 0 to 50,000 cycles per minute (CPM).
Accuracy Factory-calibrated by pulse generator, with accuracy + or -15% of reading full-scale, relative to Cesium 137.
Energy Sensitivity 1,000 CPM/mR/hr (Cs137).
Detection Alpha down to 2.5 mega (million) electron volts (MeV), with typical detection efficiency at 3.6 MeV at greater than 80%.
Beta at 50 kilo (thousand) electron volts (keV) with typical 35% detection efficiency.
Beta at 150 kilo (thousand) electron volts (keV) with typical 75% detection efficiency.
Gamma and x-rays down to 10 keV typical.
Temperature Range -20 degrees to 55 degrees C (-4 degrees to 131 degrees F) and an internal detector.
GM Detector Halogen-quenched with window thickness of 1.5 to 2.0 mg/cm2. The effective diameter is 0.92 cm/0.36”.
Dimensions Dimensions are 209 mm x 71 mm x 50 mm (8.2” x 2.8” x 1.9”).
Weight 178 g (6.3 oz).
Output 3.5 mm headphone jack for use with observer software (not included) and Windows-based computers.
Normal Background Radiation Approximately 5 to 20 CPM.
Battery 9-V alkaline battery (not included) for approximately 2,000 hours of continuous use in a normal background.

Radiation detectors can detect a broad range of ionizing alpha and beta particles, and gamma and x-rays that may be emitting harmful levels of radiation. They sense ionizing radiation with an enclosed Geiger Mueller (GM) tube to count radiation particles or rays. Alpha and beta particles are measured in counts per minute (CPM) or counts per second (CPS). Gamma rays and x-rays are measured in milliRoentgens (mR) per hour, microSieverts (μSv) per hour, or milliSieverts (mSv) per hour. Alpha particles are positively charged and heavier than beta particles, and have a limited range of approximately 3 to 5 centimeters by air. Alpha particles can be shielded by objects such as paper and unopened skin. High-energy beta particles are electrons, heavier than gamma rays, and can take either a positive or negative charge. Beta particles can be shielded by aluminum or wood. High-frequency (short wavelength) gamma rays are the strongest and lightest rays. Gamma rays are more penetrating than alpha and beta particles. They can be shielded by dense materials such as lead, and large masses of concrete, hardened steel, or water. X-rays are man-made gamma rays, and have essentially the same properties and function. Radiation detectors commonly have either an analog or a digital display. Analog radiation detectors output with a needle-point scale, and digital units generate a numerical LCD digit display. Radiation detectors are commonly used by hobbyists for safety detection and rock inspection, and professionals in the in the nuclear, medical, mining, instructional, and research industries.

SE International manufactures radiation detection products and accessories under the Radiation Alert brand. The company was founded in 1979 and is headquartered in Summertown, TN.

What’s in the Box?

  • Monitor 4 radiation detector
  • Carrying case with belt clip
  • Instruction manual
  • Conformite Europeene (CE) certification


Customer Questions & Answers

Customer Reviews

4.1 out of 5 stars
5 star
8
4 star
3
3 star
2
2 star
2
1 star
0
See all 15 customer reviews
It seems the detector works (I'm not a radiation expert).
J.Lee
It is a reliable, accurate, and durable instrument that will last many years.
S. Okubo
Apart from that it's a wonderful teaching tool and very practical/useful.
K. grey

Most Helpful Customer Reviews

24 of 24 people found the following review helpful By Pocotan on May 6, 2011
Verified Purchase
Great item to detect alpha radiation not only beta and gamma for this price, and very fast to search higher spot, if you need to connect and calculate its data, i will recommend usb version of this, but it's enoght to check aroud our environment, here in tokyo, japan.
3 Comments Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback. If this review is inappropriate, please let us know.
Sorry, we failed to record your vote. Please try again
26 of 27 people found the following review helpful By S. Okubo on October 8, 2011
Verified Purchase
I recently purchased the Monitor 4 geiger counter due to the ongoing nuclear crisis in Japan. I have been very pleased so far. It is very sensitive, accurate, durable and easy to use. Plus, the price is fair. I strongly recommend anyone who purchases this geiger to also purchase the Observer geiger software Radiation Alert OBSERVER Software For Collecting Counts From Radiation Detectors. When used together with the software, it turns the Monitor 4 into a very capable instrument. I have been using both together to check for low-levels of food and drink contamination. It has been very useful so far. I have also owned the Inspector+ geiger counter. That geiger counter has a super-sensitive pancake sensor. Only a 10-minute count is required for that instrument to get a fairly accurate reading of low-level contamination. BUT the same thing can be accomplished with the Monitor 4 when used with the Observer software. This can be done by taking a longer timed count of at least 20 minutes (but 30 minutes to 1 hour is even better). The reason the longer timed count is necessary is because the Monitor 4 has a much smaller sensor compared to the Inspector+. But in the end the same thing can be accomplished when used with the software. Plus the Monitor 4 is in stock NOW. The Inspector+ is back ordered everywhere by at least 6-12 months. You really can't go wrong with the Monitor 4 when used with the Observer software. It is a reliable, accurate, and durable instrument that will last many years. Just ask the owners of the older design Monitor 4.
1 Comment Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback. If this review is inappropriate, please let us know.
Sorry, we failed to record your vote. Please try again
20 of 20 people found the following review helpful By K. grey on August 1, 2013
I bought this as a field detector 3 years ago to compliment my hikes in Arizona - with no experience on the subject beforehand (I did a stint in particle physics, but those detectors were MUCH bigger). I knew up front it was not the most sensitive detector - but I didn't know what that meant practically.

First, the purchasing. There are two options in the base model, one you can actually assemble yourself and save some cash, the other pre-built and reasonably calibrated. I was lazy and bought it calibrated.

Made in USA of plastic.

It arrived promptly, in perfect condition. It comes with a lightly padded case with a handy clip (for your belt or backpack) sufficient to protect it from 4-foot falls. It works well and the case design allows it to be partially open - holster style - for quick extraction. I lost the case a year ago and really regret that. flashing light, three beep tones (you can turn them off), battery check, and three sensitivity levels (more later).

Basic physical character - It is not tiny, but fits very ergonomically in my hand. weight is 1/2 LB (250 g). Controls are perfectly intuitive, with positive acting slide switches that do not break. It has survived a dozen+ falls without its case, one included bouncing down several flights of rocks. The mica window over the tube has a metal grid which has saved it several times. It is not waterproof. Battery life is VERY long. I have changed the battery twice, ever - but out of paranoia - never once ran out. I'm sure you could keep it switched on for a day or more with a single 9V battery. Extremely robust unit, light enough to hold all day, but not discrete.

Sensitivity is a tradeoff. It has three levels, to 0.5 mR/hour, up to 5 mR/hour, and to 50 mR/hour.
Read more ›
2 Comments Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback. If this review is inappropriate, please let us know.
Sorry, we failed to record your vote. Please try again
28 of 31 people found the following review helpful By Coronet RT on January 30, 2011
Verified Purchase
This is a good product for the price however it seems it could be more sensitive. Plus the material you are testing needs to be directly in front of the scanner or it will not register to the geiger counter.
1 Comment Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback. If this review is inappropriate, please let us know.
Sorry, we failed to record your vote. Please try again
13 of 13 people found the following review helpful By T400 on December 2, 2013
Verified Purchase
I purchased this device because I am working on radioactive isotope 32P (strong beta) extensively, and I want a personal device that measures me to ensure there is no contamination on me after work.
First of all, it does count. However, it is not sensitive enough compare to a traditional Geiger counter with a pancake detector.
I have compared side by side that when the traditional one used in the lab gives about 1.5k cpm, this Monitor4 does not show any difference compare to background, even when the detector is about 1-inch to the source.
I am not sure about other application, for serious beta ray detection it does not work well.
1 Comment Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback. If this review is inappropriate, please let us know.
Sorry, we failed to record your vote. Please try again
14 of 16 people found the following review helpful By William E. Sadler on April 29, 2011
Verified Purchase
You will save a lot of $$ if you buy a modern instrument (like this one) vs an old CD 700 series meter, then have to get it refurbished and calibrated. While not as bulletproof as the old metal CD survey meters, this is new, it's calibrated, and in the long run cheaper.
Comment Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback. If this review is inappropriate, please let us know.
Sorry, we failed to record your vote. Please try again
6 of 6 people found the following review helpful By J.Lee on August 31, 2013
Verified Purchase
Pro: cheaper than its brother (Inspector). Con: analog meter - have to count the "beeps" to measure CPM/accumulated readings.
It seems the detector works (I'm not a radiation expert). I get background radiation 25-30 'beeps' a minute(CPM) here in SW US, and no significantly higher level was detected in the food that I've tested so far (wild salmon, squid, etc. from the pacific).
I was cleaning up a closet today and found an old (20+Y.O.) gas lantern and remembered that some old filaments for those lanterns include radioactive material. The detector proved itself by showing 300+ CPM level (lower mR/hr for beta & gamma measures) on the filament. Obviously, the detector works!
Comment Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback. If this review is inappropriate, please let us know.
Sorry, we failed to record your vote. Please try again

Customer Images

Most Recent Customer Reviews

Search