e. Humidity and moisture can cause erroneous Attachment 5 readings in some detectors. f. RF interference from two-way radios, microwaves, etc. can affect detectors. g. High radiation fields can saturation in some detectors. h. Some instruments are energy dependent and can give false readings if high or low energy radiations are present. i. Light can influence some detectors. A tiny hole in the window can result in erroneous readings. j. Contamination on the surface of the probe or in some cases, Xenon gas, can give false readings. 3. Returning the Instrument a. Survey the instrument for contamination. b. Use the HIS-20 system to return the instrument. c. Report any problems with the instrument supervision. L. Radiation Survey Instruments Objective B.18 1. The most commonly used dose rate instrument at TVA and the preferred instrument for setting Explain tissue personnel dose rates is the ionization chamber. equivalence. 2. GM instruments, are sometimes preferred for special applications, such as the teletector for radioactive material shipments. 3. The Microanalyst, a scintillation detector, is State reasons: quick required for release surveys of bulk materials, response, sensitive, such as clean trash. reach, and audible. 4. Portable area radiation monitors usually have GM detectors. 5. Neutrons must be detected with special neutron detection equipment, such as the Ludlum 12.4. M. Contamination Survey Instruments Objective B.19 1. Friskers can be used to count smears for certain applications. 2. Friskers can also be used to direct survey items for low levels of contamination. 3. contamination survey instruments may be portable alpha survey instruments such as the Surveyor M. 4. Laboratory counting instruments will be set up for Beta/Gamma and a separate instrument for alpha. N. Instrument Efficiency 1. Instrument efficiency is a measure of how effective an instrument is at measuring all of the Objective B.20 radiation present.
e. Humidity and moisture can cause erroneous readings in some detectors. f. RF interference from two-way radios, microwaves, etc. can affect detectors. g. High radiation fields can saturation in some detectors. Attachment 5 h. Some instruments are energy dependent and can give false readings if high or low energy radiations are present. i. Light can influence some detectors. A tiny hole in the window can result in erroneous readings. j. Contamination on the surface of the probe or in some cases, Xenon gas, can give false readings. 3. Returning the Instrument a. Survey the instrument for contamination. b. Use the HIS-20 system to return the instrument. c. Report any problems with the instrument supervision. L. Radiation Survey Instruments 1. The most commonly used dose rate instrument at TVA and the preferred instrument for setting personnel dose rates is the ionization chamber. 2. GM instruments, are sometimes preferred for special applications, such as the teletector for radioactive material shipments. 3. The Microanalyst, a scintillation detector, is required for release surveys of bulk materials, such as clean trash. 4. Portable area radiation monitors usually have GM detectors. 5. Neutrons must be detected with special neutron detection equipment, such as the Ludlum 12.4. Objective B.18 Explain tissue equivalence. State reasons: quick response, sensitive, reach, and audible. M. Contamination Survey Instruments 1. Friskers can be used to count smears for certain applications. 2. Friskers can also be used to direct survey items for low levels of contamination. 3. contamination survey instruments may be portable alpha survey instruments such as the Surveyor M. 4. Laboratory counting instruments will be set up for Beta/Gamma and a separate instrument for alpha. Objective B.19 N. Instrument Efficiency 1. Instrument efficiency is a measure of how effective an instrument is at measuring all of the radiation present. Objective B.20
RadMeasurementInstrumentLessonPlan.docx