40*40mm NaI(Tl) with Well Scintillation detector assembly for gamma-spectrometry. Well size: 20 mm in diameter, 35 mm min. in height. Complete gamma spectrometer. Just connect to your computer USB port and you are ready to go! Construction overview. Scintillation detector assembly consists of 40*40 mm (1.6”*1.6”) NaI(Tl) monocrystal with Well for tiny sources measurement in 4-pi geometry, Hamamatsu photomultiplier tube, low-noise regulated adjustable power supply, low-noise preamplifier and ADC with USB interface. Dimensions: height – 240 mm, diameter – 55 mm, weight - 600 grams. 40*40 mm NaI(Tl) detector is effective for gamma-spectrometry in more than 20 Kev – 3 Mev energy range. Typical energy resolution is around 7% for 662 Kev peak of Cs137 source. Light output of NaI(Tl) crystals depends on temperature, so after temperature change calibration is recommended. It is not recommended to change temperature of the detector faster than 1°C\minute. Scintillation crystal is optically matched with photomultiplier tube Hamamatsu R878. Voltage divider for photomultiplier is made as separate PCB unit. Anode of photomultiplier is separated from resistor divider for noise reduction. Photomultiplier is magnetically shielded. Photomultiplier power supply circuit is PWM type, output voltage is stabilized. Optimum voltage is adjusted, no user-adjustable parts inside. All power supply circuitry is hermetically sealed with silicone compound and shielded for emission reduction. Output high voltage is additionally filtered. Power consumption from USB port depends on actual voltage and less than 100 mA at maximum voltage. Low-noise preamplifier performs signal conditioning before ADC. Total noise equivalent of photomultiplier and preamplifier is less than 3 Kev. ADC is 16 bit and 48000 Hz sampling rate with plug and play compatibility (Windows XP, Vista, Windows 7 and others), no additional software drivers needed. Operating system will treat it as external USB audio device (HID class). Sensitivity and load. 40*40mm NaI(Tl) scintillation detector have very high sensitivity: around 80 000 pulses per minute to microsievert per hour. It is normal that in typical gamma radiation background (0.1 uSv/h) you will see 100-150 counts per second, or 6000 – 9000 counts per minute. ADC sampling rate is limited to 48000 Hz, so more than 1000 counts per second load is not recommended. You can see sample spectrum of Cs137, it's made using 20 nCi (740 Bq) source inside the well. Cs137 sensitivity (source inside the well) is 16 Bq per cps. Software and technical tips. Freeware PRA program is recommended for work with the detector assembly. It can be downloaded from author's web page at http://www.physics.usyd.edu.au/~marek/pra/index.html . FritzPeaks and Theremino MCA also works well. Switching OFF of absolutely all sound effects for USB sound input device is strictly required. Some Windows (especially Windows 7) drivers sets ADC gain to maximum possible at first start. It strongly reduces actual dynamic range of the detector. If it happened you need to set input signal gain to 5-7% instead of 100%, high voltage adjustment is not required. Initial setup and calibration is the same as for 63*63mm detector, you can see it (in Russian, with English subtitles) here. Optimum settings for your equipment depends on computer and operating system and may be different. If you have any questions - feel free to ask me. Please ask any questions by email im81.max@gmail.com. I have discount options up to 20% in some cases! Feedback From Buyer Date/time excellent h**********1 ( 180 ) 2016-11-20 17:30:24 ok thanks f*******8 ( 375 ) 2016-11-15 13:53:08 Excellent ! w****1 ( 18 ) 2016-11-07 07:04:18 Excellent ! bon vendeur c*******l ( 79 ) 2016-11-04 12:03:50 Perfect service!!! Thank you. j****r ( 162 ) 2016-10-31 13:57:10 Perfect... And super... l******o ( 412 ) 2016-10-28 18:41:49 Got the app Atom Radiometer (not in the instructions) then EXCELLENT on iPhone4s c***k ( 643 ) 2016-10-26 17:15:35 Item arrived in due time, thanks! t**********0 ( 36 ) 2016-10-25 09:16:15 timely shipping b**********1 ( 439 ) 2016-10-21 01:12:02 It works. Thanks! m*****p ( 113 ) 2016-10-18 23:32:49 all ok e**********o ( 244 ) 2016-10-14 14:44:06 Excellent Seller+++++Fast Delivery+++++Thank you! n******f ( 414 ) 2016-10-13 11:11:39 Fast shipping, item as described l********r ( 347 ) 2016-10-11 22:51:55 ALL OK ! A+++ m********9 ( 154 ) 2016-10-11 12:30:05 very good s*********m ( 47 ) 2016-10-09 01:27:25 Honest Transaction; Would Repeat Transactions With Seller t*************r ( 510 ) 2016-10-06 13:27:26 Working. All as described. r**************0 ( 5 ) 2016-09-26 21:03:55 Good job s***********0 ( 1 ) 2016-09-13 04:27:17 Good item. Perfect packaging. Seller recomended. a************3 ( 19 ) 2016-09-08 22:41:41 BIEN.OBJET BIEN ARRIVE.MERCI. s******4 ( 939 ) 2016-09-03 05:12:16
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