PM-7 Operating Manua.. - Voss Associates

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Algorithms Guide to Figures 4.2, 4.3 and 4.4 To maintain the desired false alarm probability at the specified confidence level, R A as determined by Eq. 2.7 is set equal to RA as defined by Eq. 2.8 and solved for T or, more appropriately, T MIN since the time calculated will be the minimum time to satisfy the constraints imposed on the measurement. T -------------------------------------------------------------------- SF R B + z R B + RDA × eff 2 Eq. 2.10 MIN = RDA × eff The sum channel in PM-7 uses Eq. 2.10 to set the count time for all channels in the instrument. If T MIN exceeds the maximum count time selected by the user, the instrument is placed out of service due to a high background condition. Guide to Figures 4.2, 4.3 and 4.4 These figures have been prepared to assist in an overall view of instrument operation, setup and capability. 1. Figure 4.1 is a nomograph of the relationship between the sigma factor, number of channels and false alarm probability. A straight edge is placed across the two variables to obtain the desired third element. For example: An instrument has seven channels and a desired false alarm rate of 0.0001 (one false alarm every 10,000 count periods) is desired. The sigma factor to accomplish this would be approximately 4.19. Example two: There are seven channels and the sigma factor has been set to 3.7. The false alarm rate would be approximately 0.00075. Note PM-7 has seven channels comprised of the six individual detector channels plus the sum channel. 2. Figures 4.2 and4.3 are nomographs of the response of a PM-7 detector to 60 Co and 137 Cs. The straight edge is again used to determine the desired setup or capability of a detector. For example: Background observed to be 6000 cps and the count time is set to 5 seconds. The RDA for 60 Co is approximately 38 and 76 for 137 Cs. 4-6 _Personnel Monitor -7 Techical Guide Thermo Fisher Scientific
Algorithms Guide to Figures 4.2, 4.3 and 4.4 Figure 4.2. Sigma Factor Nomograph, 11468-C176 Thermo Fisher Scientific Personnel Monitor -7 Techical Guide_4-7_
Page 3 and 4: PM-7.Man Rev. C Personnel Monitor-7
Page 5 and 6: Definition of Terms Writing Convent
Page 7 and 8: WEEE Compliance WEEE Compliance Not
Page 9 and 10: Contents Definition of Terms ......
Page 11 and 12: Troubleshooting ...................
Page 13 and 14: Figures CE Compliance Marking .....
Page 15 and 16: Chapter 1 Installation and Setup Ov
Page 17 and 18: Introduction Overview If the PM-7 i
Page 19 and 20: . Scintillator Installation Introdu
Page 21 and 22: Chapter 2 Operational Setup Configu
Page 23 and 24: Introduction Configuration Select >
Page 25 and 26: Chapter 3 General Description Overv
Page 27 and 28: General Description Detectors Detec
Page 29 and 30: General Description Background Upda
Page 31 and 32: Chapter 4 Algorithms Counting Algor
Page 33 and 34: Algorithms Statistical Theory To us
Page 35: Algorithms Statistical Theory N A c
Page 39 and 40: Algorithms Guide to Figures 4.2, 4.
Page 41 and 42: Chapter 5 PC-Based Calibration/Conf
Page 43 and 44: General Description Windows-Based S
Page 49 and 50: v. Edit General Description Windows
Page 51 and 52: Chapter 6 Maintenance Preventative
Page 53 and 54: General Description Preventative Ma
Page 55 and 56: General Description Troubleshooting
Page 57 and 58: General Description Recommended Ope
Page 59 and 60: Chapter 7 PM-7 Microcomputer Hardwa
Page 61 and 62: PM-7 MICROCOMPUTER HARDWARE COMPLEM
Page 67 and 68: Chapter 8 General Purpose Detector
Page 69 and 70: General Purpose Detector Board YP11
Page 77 and 78: Chapter 9 RS-485 Driver Board YP114
Page 79 and 80: Chapter 10 Dual Channel Ultrasonic
Page 85 and 86: Chapter 11 RS-232 to RS-485 Convert
Page 87 and 88:
General Purpose Detector Board YP11
Page 89 and 90:
Chapter 12 Large Area Plastic Scint
Page 91 and 92:
General Purpose Detector Board YP11
Page 93 and 94:
Chapter 13 Miscellaneous Parts Part
Page 95 and 96:
Chapter 14 Options Listed herein ar
Page 97 and 98:
Chapter 15 Recommended Spare Parts
Page 99 and 100:
Appendix A Technical Support Techni
Page 101 and 102:
Appendix B Thermo Scientific Sales
Page 103 and 104:
Serving Armenia, Belarus, Czech Rep
Page 105 and 106:
Serving Afghanistan, Bangladesh, Bh
Page 107 and 108:
Appendix C Drawings Table C-1. PM-7
Page 109 and 110:
Index: A Index A Algorithms 4-1 Aud
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PM-7 Operating Manua.. - Voss Associates

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