![](\"http:\/\/www.tyne-engineering.com\/images\/7043-001-GAMM.jpg\")
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Compensation for Gamma background is crucial in tritium measurement, since a gamma field of 1mR\/Hr will generate 500 times the ionization generated in 1\u00b5Ci\/m\u00b3 of tritium. Tyne designed the four, 250 cc ion \u2013chambers in a cruciform with each chamber connected to an ultra sensitive electrometer amplifier and filter. All signals pass through the ADC converter, and the micro-processor calculates and displays the tritium value. To cover high ranges of tritium a separate small ion chamber is used. Measurements such as flow from the solid-state flowmeter and chamber temperature are also monitored by the micro-processor.\u00a0\u5bf9\u03b3\u80cc\u666f\u7684\u8865\u507f\u662f\u6c1a\u6d4b\u91cf\u7684\u5173\u952e\uff0c\u56e0\u4e3a1 mR\/HR\u7684\u4f3d\u739b\u573a\u4ea7\u751f\u7684\u7535\u79bb\u91cf\u662f1 mI\/m\u6c1a\u7535\u79bb\u7684500\u500d\u3002TYNE\u8bbe\u8ba1\u4e86\u56db\uff0c250\u6beb\u5347\u79bb\u5b50\u5ba4\u5728\u4e00\u4e2a\u5341\u5b57\u5f62\uff0c\u6bcf\u4e2a\u5ba4\u8fde\u63a5\u5230\u4e00\u4e2a\u8d85\u7075\u654f\u7684\u9759\u7535\u8ba1\u653e\u5927\u5668\u548c\u6ee4\u6ce2\u5668\u3002\u6240\u6709\u4fe1\u53f7\u901a\u8fc7ADC\u8f6c\u6362\u5668\uff0c\u5fae\u5904\u7406\u5668\u8ba1\u7b97\u5e76\u663e\u793a\u6c1a\u503c.\u4e3a\u4e86\u8986\u76d6\u9ad8\u8303\u56f4\u7684\u6c1a\uff0c\u4f7f\u7528\u4e86\u4e00\u4e2a\u5355\u72ec\u7684\u5c0f\u79bb\u5b50\u5ba4\u3002\u6d4b\u91cf\u7ed3\u679c\uff0c\u5982\u6765\u81ea\u56fa\u6001\u6d41\u91cf\u8ba1\u7684\u6d41\u91cf\u548c\u5ba4\u5185\u6e29\u5ea6\uff0c\u4e5f\u7531\u5fae\u5904\u7406\u5668\u8fdb\u884c\u76d1\u6d4b\u3002<\/p>\n
| Sensitivity<\/td>\n | 1\u00b5Ci\/m\u00b3 ( 0.05 DAC)<\/td>\n<\/tr>\n |
| Accuracy<\/td>\n | \u00b13\u00b5Ci\/m\u00b3 from 1 to 100\u00b5Ci\/m\u00b3, \u00b110% from 100\u00b5Ci\/m\u00b3 to 20,000 \u00b5Ci\/m\u00b3<\/td>\n<\/tr>\n |
| Range<\/td>\n | 1 \u00b5Ci\/m\u00b3 to 199,999 \u00b5Ci\/m\u00b3<\/td>\n<\/tr>\n |
| Detector<\/td>\n | 4 matched chambers – Two for measuring, two for compensation<\/td>\n<\/tr>\n |
| Measuring chamber effective volume<\/td>\n | 500 cc (2 measuring chambers of 250cc each)<\/td>\n<\/tr>\n |
| Flow rate<\/td>\n | 1.0 L\/m<\/td>\n<\/tr>\n |
| Zero stability<\/td>\n | \u00b11\u00b5Ci\/m\u00b3 immediately after unit is powered on<\/td>\n<\/tr>\n |
| Background cancellation<\/td>\n | Less than 10% of the reading change in 20 mR\/hr field<\/td>\n<\/tr>\n |
| Radon compensation<\/td>\n | Included in the software<\/td>\n<\/tr>\n |
| Ion trap<\/td>\n | Built into each ion chamber<\/td>\n<\/tr>\n |
| Dust filter<\/td>\n | Built into the unit.<\/td>\n<\/tr>\n |
| Noble gas cancellation<\/td>\n | Ports for air inlet\/outlet of measuring chambers and compensation chambers are accessible on surface plate so silica gel drier can be placed between the chambers to compensate for presence of noble gas.<\/td>\n<\/tr>\n |
| Tritium Discrimination<\/td>\n | Instrument can discriminate in a field of HTO and elemental H3 using the silica gel drier.<\/td>\n<\/tr>\n |
| Purge\/Decontamination<\/td>\n | All 4 Chambers can be heated up by a cartridge heater controlled by unit<\/td>\n<\/tr>\n |
| Display<\/td>\n | Graphic touchscreen LCD display. Unit displays the values(tritium and Gamma) both in numerical format and graphical trend.<\/td>\n<\/tr>\n |
| Communication<\/td>\n | Can be configured to RS232(Short distance) or RS485(Long distance).<\/td>\n<\/tr>\n |
| Analog output<\/td>\n | 0-5 V Linear or logarithmic voltage output.<\/td>\n<\/tr>\n |
| Power supply<\/td>\n | 2.5 V- 5V external power supply, or 3 C-cell battery. Total power consumption is 150mA.<\/td>\n<\/tr>\n |
| Gamma measurement<\/td>\n | Gamma is measured directly by the unit. Gamma measuring range is from 0.1mR\/h to 10R\/h<\/td>\n<\/tr>\n |
| Alarm<\/td>\n | Tritium alarms, gamma alarms, low air flow alarms will all be shown by red LED light and by an audible device.<\/td>\n<\/tr>\n |
| Data logging<\/td>\n | The tritium and gamma values are logged every minute with current time and date stamp<\/td>\n<\/tr>\n |
| Size and weight<\/td>\n | 8″(L)x5″(H)x5″(W), 7 lbs.<\/td>\n<\/tr>\n |
| Drier<\/td>\n | Note that the silica gel drier is not part of the standard equipment, but can be supplied as an extra.<\/td>\n<\/tr>\n |
| Response Time<\/td>\n | 30 seconds at 90% of signal<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n <\/div>","protected":false},"excerpt":{"rendered":" Compensation for Gamma background is crucial in tritium measurement, since a gamma field o <\/p>\n","protected":false},"author":18,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_vp_format_video_url":"","_vp_image_focal_point":[]},"categories":[3],"tags":[],"_links":{"self":[{"href":"https:\/\/www.bihec.com\/tyne\/wp-json\/wp\/v2\/posts\/51"}],"collection":[{"href":"https:\/\/www.bihec.com\/tyne\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bihec.com\/tyne\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bihec.com\/tyne\/wp-json\/wp\/v2\/users\/18"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bihec.com\/tyne\/wp-json\/wp\/v2\/comments?post=51"}],"version-history":[{"count":0,"href":"https:\/\/www.bihec.com\/tyne\/wp-json\/wp\/v2\/posts\/51\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.bihec.com\/tyne\/wp-json\/wp\/v2\/media?parent=51"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bihec.com\/tyne\/wp-json\/wp\/v2\/categories?post=51"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bihec.com\/tyne\/wp-json\/wp\/v2\/tags?post=51"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}} |