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RAE Honeywell in Partnership with BNC Scientific

RAE Honeywell in Partnership with BNC Scientific

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RAE Honeywell in Partnership with BNC Scientific

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  1. RAE/Honeywell in Partnership with BNC Scientific GammaRAE II R Training

  2. Q:Placing the device into operation A: See manual – pg. 9-12

  3. Q:Placing the device into operation

  4. Q:Setting user adjustable features (what the setting features represent, i.e.,threshold setting and their effect on false alarm and sensitivity of device

  5. A:See manual – pg. 24 and 25

  6. Q: displays and alerts (monitoring system status and recognizing and understanding system notifications) A:See manual – pg. 8

  7. Q:Conducting basic operator maintenance (charging of batteries, etc) A: See manual – pg. 6

  8. Q:Overview of how alarm algorithm works and how the device sets and/or uses background including answers to following questions: Is alarm threshold based on the detectors gross count rate or a derived quantity such as A:There are two modes: Search Mode and Safety Mode. Search Mode alarm threshold = (Background radiation level) + (Search Alarm) x (standard deviation of background radiation level). Safety Mode sets Low or High absolute alarm threshold based on dose and dose rate.

  9. Q: Is alarm threshold based on the detectors gross count rate or a derived quantity such as exposure rate or an energy-dependent count rate? A:The alarm threshold is based on detector gross count rate and accumulated count.

  10. Q:What time period (i.e. integration time) that is used to assess whether or not radiation has exceeded threshold? A:125ms

  11. Q: How frequently is the threshold condition assessed? A:1Hz

  12. Q:Is the alarm fixed or does it vary with radiation background? A:Safety Mode alarms (Low and High) are fixed based on dose and dose rate including background. Search Mode alarm varies with the background level.

  13. Q:If the threshold is fixed what are the threshold values? A:Safety Mode alarms (Low and High) are programmable which can be set by users. Safety High: default setting: 200 µR/h; range: 0~600R/h. Safety Low: default setting: 50 µR/h; range: 0~600 R/h. Dose High: default setting: 25 R; range: 0~999.9R. Dose Low: default setting: 5R; range: 0~999.9R.

  14. Q:If the threshold is variable, how high above background is the threshold set? If the difference is based on a formula should the formula be provided? A:There are two modes: Search Mode and Safety Mode. Search Mode alarm threshold = (Background radiation level) + (Search Alarm) x (standard deviation of background radiation level). Search Alarm number is how many sigmas (standard deviation of stored background reading which was recorded after initial 36-second background reading countdown). Safety Mode sets Low or High absolute alarm threshold based on dose and dose rate. Search Alarm: default setting: 5.8; range: 1~9.9. Safety LOW and HIGH settings: 0~600mR/h.

  15. Q:If the threshold varies with the background, how frequently and for what duration is the background measured? A:The background was measured only when the instrument was initially turned on. However, at any time the background can be updated by users in Search Mode.

  16. Q:If the alarm decision is based on multiple variations, intermediate and multiple decisions (i.e., energy windowing, region of interest analysis, etc) how are the decisions processed and alarm decisions made? A:Alarm decision is only based on dose or dose rate.

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