Geiger Counter Nuclear Radiation Detector - FNIRSI Radiation Dosimeter with LCD Display, Portable Handheld Beta Gamma X-ray Rechargeable Radiation Monitor Meter, 5 Dosage Units Switched

15 years ago I woked as a Forester in Northern WI. I got the opportunity to work inside the Enterprise Radioactive Forest (google this). A forest that the USFS experimented on with Cesium in the 1970's to help deterime what would happen if the big one ever happened and what the effects of radioactive fallout would be on our forest resources. The project ended decades ago, but the forest continued on. When I worked as a forester, I can say it was the most bizzare forest I ever worked in. The trees all grew weird, were stunted, or misformed. A lot had wires coming out of them from the experiment. I also found alunimum rods everywhere. I picked up one of these rods and used it as a walking stick during the project, and kept it as a momento of working on the project (nothing illegal, it was trash). Years later, I found it in my garage and kind of wondered, is this radio active? Seems logical that it could be. All reserch I did on transfering of radiation to metals like aluminum said it was unlikely, but I was curious so I bought this detector. Glad to find out that it wasn't and I could keep my momento. It actually did not register anything, while bannanas sure did.

Before I begin, I need to say that this is a radiation counter that has been designed to be a dosimeter. It is not a Geiger counter. Other reviewers think that it us a Geiger counter which is something entirely different. The only thing that the two have in common is that they both use a Geiger-Mueller tube. This instrument measures the accumulated radiation exposure in fractional units of Sieverts over time. This is a high quality dosimeter considering the price. It can read gamma, beta and x-radiation dosages. Two screens are provided: the first is numerical and the second is graphical. The manufacturing quality of this instrument is evident at first glance. It is beautifully packaged in order to protect the Geiger-Mueller tube in shipping which is otherwise subject to shock breakage. I purchased this item in order to monitor radiation dosages in two places in my home. The first is an activated charcoal filter that I have on my water supply in the basement while the second is a reverse osmosis system with charcoal filters under the kitchen sink. Since there is radon in my well water supply, I prefer to remove as much as possible before it is delivered to the faucets in the house. It also serves to reduce the radon levels in air due to cooking, washing, showering and laundry. Capturing the radon in activated charcoal will also capture radon decay products (daughter products). Some of these have very short lifetimes, but some are extremely long and tend to build up in the activated charcoal filters over time. I wanted to see how these radiation dosage levels increased over time in order to determine the optimal time to change the filters. The first thing that I noticed was that in just one week, after a basement filter change, the radiation had already built up by a significant amount. The radon radioactivity in our water is approximately 3000 pCi/L. If allowed to vaporize due to cooking, washing, bathing and laundering, this amount of radiation could add about 0.3 pCi/cubic meter to the air. The radiation dosage level that was measured close to the tank was 1.4 uSv/hr according to the meter. If multiplied by the number of hours in a year, 8760, we arrive at the accumulated dose per year which is 12.3 mSv. This is the amount of radiation exposure that would be possible were a person to stay in proximity to the tank for an entire year. This exceeds the NRC dosage guidelines of 1 mSv (0.1 rem) per year. Clearly, the filter should not be placed anywhere near where people or children would normally gather or play, for example, a finished basement. I will be monitoring the activated charcoal filter tank for several weeks to see if the radiation buildup reaches equilibrium as the filter capacity is exhausted. This will provide a guideline for how often the filter should be replaced. Short term exposure to the filter during a filter change should not be an issue provided that safe handling practices are followed. As a followup, I have decided to change the activated charcoal filter in the basement four times per year since no one is in proximity to the filter most of the time. One additional piece of information: For occasional proximity to radiation by workers, the annual permissible dose is 50 mSv (5 rem) per year. On the subject of radioactivity and dosage; they are not the same, pCi/L cannot be converted to uSv, or vice versa. The first is an instantaneous radiation level in disintegrations per second from a liter of water, while the second is an accumulated exposure dosage over time. Finally, I am not a licensed professional engineer or health physicist. Always consult with a professional engineer or health physicist who is. Most water system installers pose as being knowledgeable, but they are not. While they may attend training courses in radon mitigation, they do not possess the knowledge required to make sound health decisions for your family.

This one is simple, user friendly, and to the point. Its built well and reliable, its battery life could be better, easy to read and seems sensitive. Worth the purchase if you like uranium glass like i do.

Does what it's supposed to. These are meant to be worn by ppl who work around radiation every day. They turn them on at the start of the day and turn them in at the end so their cumulative dose can be measured. It will detect radioactive isotopes in the immediate vicinity too, though it's more for measuring cumulative dose, which is more relevant, imho. It's not really meant for pinpoint accuracy either but if something around is radioactive it will ɗefinitely detect it. It also has an alarm that will go off if the rate of accumulation crosses a certain threshold, which you can set. It's basically on-the-job safety equipment, so it's pretty sturdy and has long battery life, can easily last through an 8hr day before it needs a recharge. You can switch between: 1.) micro-Sieverts/hr ｵSv/h 2.) Grays per hour Gy/h 3.) milliRoentgen per hour mR/h 4.) Counts per second 5.) Counts per minute No it will not detect the americium-241 (Am-241) in your smoke detector, no it will not detect the trace isotopes in bananas or concrete. According to the United States Nuclear Regulatory Commission: 0.0013 urem per hour at one meter from an ICSD containing a 1 uCi Am-241 source. : So about .0013urem is normal and safe. This matches up with what the dosimeter is reading at all times: ~0.0013urem Background radiation, mostly from the sun.

This device is an absolute disaster and a scam. IT FAKES READINGS. When I decided to invest in a geiger counter for my personal safety and peace of mind, little did I know that my hard-earned money would be wasted on an absolute disaster of a device. The geiger counter I purchased, touted as a reliable tool for detecting radiation, turned out to be a nightmare in every possible aspect. The most important thing by far however are the fake numbers this geiger counter shamelessly produces. It's as if the device has a mind of its own, conjuring up figures that have no basis in reality. When placed next to a United Nuclear test card, it would completely make up fake numbers. Not only that, the CPM would always only change by weird, fixed pattern. This leads me to believe that they are making up numbers. This is absolutely unacceptable for a radiation detector that touts itself as a health tool. The geiger counter's battery life is nothing short of abysmal. It's as if the manufacturers took pleasure in designing a device that drains batteries faster than a leaky faucet wastes water. Within a very short period of time, the FNIRSIR began to lose charge quickly. In under a couple hours, it was fully dead with the device being very hot. This is absolutely unacceptable for a device that’s supposed to keep someone safe. But the cherry on top of this disastrous cake is the fact that the UI exacerbates the device's already apparent accuracy issues. The tiny, barely legible screen displays readings in a font size that requires a magnifying glass to discern. And when the readings themselves are as unreliable as a coin toss, struggling to decipher them due to poor UI design becomes an added insult to injury. In conclusion, the geiger counter I purchased has turned out to be a monumental disappointment. Its abysmal battery life, laughable accuracy, and propensity for producing fake numbers have shattered any semblance of trust I might have had in its functionality. I could forgive any of these problems if only it would actually accurately read radiation levels. I would strongly advise anyone considering buying this geiger counter to think twice and explore more reliable options on the market. Please look at the other 1 star reviews and videos and notice the random CPM and see how many people have the same problem I have. Your safety and peace of mind deserve better than this sorry excuse for a radiation detection device.

Ended up returning device. The audible alarm never triggered once the alarm threshold was reached and passed. Settings menu showed vibration,led, and speaker was turned on. The other problem was that the counter could not be recognized by a windows 11 desktop using a know good usb type C data cable, so future firmware updates are impossible. As for the readings, they were very close to my radiacode 103 and gq gmc-500 plus. The tube is located along the left edge if you are holding the device withe the usb port on the bottom. Except for my issues, ( could be my unit), I would reccomend this as a first counter or the cost.

Works. As soon as I turned it on it started measuring background radiation in the 0.02 to 0.11 uSv/h. But I couldn’t really tell if it was working or not or just measuring some kind of noise. So I drove to work and back home and walked around at work but nothing triggered a higher reading. So I took it to a lab where they have Cobalt 60 readily available for radiation testing and just walking into the outside room behind the multiple feet of lead and concrete my meter went from 0.01 to 1.0uSV/h in just a few seconds. The little red light at the top wasn’t flashing anymore, it was solid red. So I knew that meant it was measuring the radiation and it was tripping an alarm to let me know I was way over the 1uSv/h alarm limit. That was good enough for me. On another note, the menu system is a little kludgy and you cannot save a screenshot or any history which is kinda disappointing, but for a quick measurement for on the spot radiation testing, I would say it does what it promises. I. Just wish it would connect to my phone through Bluetooth so I can download the data to save for later.

this provides some real time tracking of your local radiation, the battery lasts for maybe a day.