








GQ gmc-320 Plus Geiger Counter Nuclear Radiation Detector Meter Beta Gamma X Ray Europe : desertcart.in: Industrial & Scientific Review: Excelente producto. Tengo mi oficina cerca de un gabinete de radiología, pude comprobar que no estoy expuesto a radiación. Lo probé también con un equipo de rayos x dentales, funciona a la perfección. Muy satisfecho. Review: This is a very good Geiger counter for the price. I've been using it for some at-home, low-budget experiments with small amounts of radioactive substances, and it has worked extremely well, with very consistent readings both when left in the same spot with background radiation and when it is placed next to a radioactive source (a sealed check source, uranium ore, a 2.33 g piece of depleted uranium metal, a thorium gas mantle, etc). Battery life is excellent. I have also had good luck with the software. The device records the number of counts for every second in its memory, which holds about two weeks of data. The software allowed me to download the data to my computer and convert it to CSV format, which can then be analyzed in Excel to see variations in natural background radiation, to determine if a very slightly radioactive source is measurably more radioactive than background, and the like. The sensitivity is a little low and quite dependent on where an object is placed relative to the narrow Geiger-Mueller tube, which is located at the bottom of the device below the buttons. I have two check sources: a sodium-22 source to check gamma sensitivity and a thallium-204 source for betas. With the beta source, I found that the plastic surrounding the GM tube prevents it from picking up the betas emitted by Tl-204 (maximum energy 764 keV; the advertised minimum for this device is 250 keV). If you open it up and put the source directly against the GM tube, it does gain the ability to detect them, although you shouldn't do this with non-sealed sources because they will contaminate the tube. With the gamma source, a 2-hour average of 6032 cpm was recorded, based on the source being placed directly against the bottom of the unit with the plastic back on. From this, I calculated an efficiency of 0.57%. This is a little low, but it still makes for a very useful device. Finally, the manufacturer runs a helpful forum where you can ask questions and try to solve issues you might have with it, and I hear their customer service is good although I've never used it myself. All in all, I'm very satisfied and the price can't be beat. edit: Got a third sealed check source: manganese-54, which emits only one gamma ray at 835 keV (99.98% of the time) and virtually nothing else. The sensitivity was only about 0.30%. I believe I overestimated Na-22 because it emits both a gamma and a positron (which produces another two gammas) on the vast majority of its decays. But even 0.3% is fine for most purposes and everything else is fantastic, so I'll keep the rating at 5 stars.













| ASIN | B00I8GQ1EC |
| Are batteries included? | No |
| Batteries | 14500 Lithium Ion batteries required. |
| Best Sellers Rank | #16,576 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #3 in Geiger Counters |
| Brand | GQ |
| Colour | White |
| Country of Origin | USA |
| Customer Reviews | 4.4 4.4 out of 5 stars (347) |
| Date First Available | 15 September 2015 |
| Item Dimensions LxWxH | 12.7 x 7.2 x 2.5 Centimeters |
| Item Height | 1 Inches |
| Item Weight | 235 g |
| Item Width | 2.85 Inches |
| Item model number | GMC-320Plus Fulfill |
| Lithium Battery Packaging | Batteries packed with equipment |
| Lithium battery energy content | 2.6 Watt Hours |
| Lithium battery weight | 0.7 Grams |
| Manufacturer | GQ Electronics LLC |
| Model number | GMC-320Plus Fulfill |
| Number of lithium ion cells | 1 |
| Product Dimensions | 12.7 x 7.24 x 2.54 cm; 235 g |
C**S
Excelente producto. Tengo mi oficina cerca de un gabinete de radiología, pude comprobar que no estoy expuesto a radiación. Lo probé también con un equipo de rayos x dentales, funciona a la perfección. Muy satisfecho.
T**K
This is a very good Geiger counter for the price. I've been using it for some at-home, low-budget experiments with small amounts of radioactive substances, and it has worked extremely well, with very consistent readings both when left in the same spot with background radiation and when it is placed next to a radioactive source (a sealed check source, uranium ore, a 2.33 g piece of depleted uranium metal, a thorium gas mantle, etc). Battery life is excellent. I have also had good luck with the software. The device records the number of counts for every second in its memory, which holds about two weeks of data. The software allowed me to download the data to my computer and convert it to CSV format, which can then be analyzed in Excel to see variations in natural background radiation, to determine if a very slightly radioactive source is measurably more radioactive than background, and the like. The sensitivity is a little low and quite dependent on where an object is placed relative to the narrow Geiger-Mueller tube, which is located at the bottom of the device below the buttons. I have two check sources: a sodium-22 source to check gamma sensitivity and a thallium-204 source for betas. With the beta source, I found that the plastic surrounding the GM tube prevents it from picking up the betas emitted by Tl-204 (maximum energy 764 keV; the advertised minimum for this device is 250 keV). If you open it up and put the source directly against the GM tube, it does gain the ability to detect them, although you shouldn't do this with non-sealed sources because they will contaminate the tube. With the gamma source, a 2-hour average of 6032 cpm was recorded, based on the source being placed directly against the bottom of the unit with the plastic back on. From this, I calculated an efficiency of 0.57%. This is a little low, but it still makes for a very useful device. Finally, the manufacturer runs a helpful forum where you can ask questions and try to solve issues you might have with it, and I hear their customer service is good although I've never used it myself. All in all, I'm very satisfied and the price can't be beat. edit: Got a third sealed check source: manganese-54, which emits only one gamma ray at 835 keV (99.98% of the time) and virtually nothing else. The sensitivity was only about 0.30%. I believe I overestimated Na-22 because it emits both a gamma and a positron (which produces another two gammas) on the vast majority of its decays. But even 0.3% is fine for most purposes and everything else is fantastic, so I'll keep the rating at 5 stars.
D**S
Le tarif est correct par rapport à d'autres appareils similaires que j'ai trouvé dans mes recherches. Vu que mon utilisation prévue est quelques mesures dans mon environnement et non un usage professionnel. L'appareil est plutôt bien pensé. Par exemple l'affichage change de sens lorsque l'on retourne l'appareil, comme sur les iphone. Les fonctions vont à l'essentiel. Il y a aussi un rétroéclairage automatique de l'écran. Concernant les logiciels je ne les ai pas encore essayé... peut-être un ajout à cette revue. Ce qui m'à surpris ce sont les accessoires fournis : un cable mini usb de bonne qualité, une prise usb secteur certes étasuniene, une prise allume cigare usb et un étuis en tissu. Ca change d'apple... En même temps, la prise étasuniene n'est pas près de me servir et j'ai déja de nombreux cables usb et aussi des prises usb allume cigare... Et puis l'étuis, j'aurai aimé qu'il protège efficacement l'écran, qui est la partie fragile. Donc aucun des accessoires ne va me servir... Et j'aurai aimé une offre moins chère encore... sans les inutiles accessoires. La boite en carton fait un très bon étuit, sans compter que l'appareil est fourni emballé dans un sachet en une espèce de plastique molletonné.
S**.
This is a great little geiger counter (nuclear radiation monitor). This does not read EMF...that is another type of monitor. The GMC-320 measures Beta, Gamma, and X-Ray radiation. The GMC-320 does not measure Alpha radiation but the GMC-600/Plus does measure Alpha radiation. The GMC-320 does not have WiFi connectivity but the GMC-320 Plus does have WiFi connectivity. I am checking the GMC-320 with several types of radiation sources such as: rocks, beads and lantern mantles. I'm comparing the readings to an old Radalert (Model 50 or 100). The lantern mantles are quite energetic. There are all kinds of display modes including graphing. The monitor can interface with a computer. The monitor includes rechargeable batteries and can be charged via USB connection. The monitor measures 3 x 5 x 1" and weighs 4.37 ounces. A great little geiger counter!
S**C
Je cherchais un compteur Geiger-Müller bon marché, mais permettant néanmoins d''enregistrer les mesures et de les lire avec un PC. Les modèles d''entrée de gamme des autres fabricants que j''ai pu trouver ne le permettent pas. Il y a un petit logiciel de démonstration et une documentation en anglais sur le site internet de GQelectronicsLLC, qui permet de tester virtuellement l''appareil, cela correspond parfaitement avec ce que j''ai reçu. En plus des pilotes pour Windows & Linux, il y a deux programmes téléchargeables pour récupérer les données, cela permet notamment d''envoyer régulièrement les relevés soit sur le site du fabriquant, avec une carte du monde, soit où l''on veut sur le web, avec la version « pro » plus élaborée, non fournie avec l''appareil. Le compteur tient dans une poche, l''autonomie est d''au moins trois jours. Le site internet est très moche (en mars 2015) mais on y trouvera pas mal d'informations et de liens utiles dans la partie forum. L''utilisation est très simple, j''ai pu mesurer un bruit de fond entre 0,05 et 0,15 µS/h dans Paris et proche banlieue... pas de mauvaise surprise pour le moment... bref je recommande vivement !
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