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ALPHAiX
with Counter Tube Type G
End window counter tube for
measurement of ALPHA, BETA
and GAMMA radiation. Laboratory
counter tube for surface
measurement. Suitable for
contamination measurements
JS Monday 10 January 2011
for Counter Tube Type G
TABLE OF CONTENTS
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Table of Contents
Related Manuals for Innova ALPHAiX Series
Summary of Contents for Innova ALPHAiX Series
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Page 1: Table Of Contents
OPERATING INSTRUCTIONS for Counter Tube Type G TABLE OF CONTENTS Dose rate measurement with Type G counter tube Page 2 Statistical error of measurement Page 2 Contamination measurement Page 3 Detection limit Page 4 KC1 standard compound Page 5 Differentiation of radiation types Page 6 Some more theory Page 7... -
Page 2: Dose Rate Measurement With Type G Counter Tube
OPERATING INSTRUCTIONS for Counter Tube Type G Dose Rate Measurement with Type G Counter Tube The Type G end window counter tube is a pure contamination counter tube and not suitable for dose rate measurement. Simply because of its very high sensitivity, this counter tube becomes saturated relatively fast in cases of intense radiation which often arise in dose rate measurements. -
Page 3: Contamination Measurement
OPERATING INSTRUCTIONS for Counter Tube Type G Contamination Measurements For contamination measurements counter tubes must be able to detect BETA radiation and possibly ALPHA radiation as well. To ensure the required detection sensitivity, the counter tube must always be used without a protective cover for contamination measurements, i.e. with the end window open. -
Page 4: Detection Limit
OPERATING INSTRUCTIONS for Counter Tube Type G Detection Limit (DL) The detection limit (DL) of an instrument is calculated as follows: DL = 3 x √ background counts For counter tube G (background counts = 30) the detection limit for a 1 minute measurement is 16.5 impulses and the tolerance value would therefore be 46.5 impulses: 3 x √... -
Page 5: Kc1 Standard Compound
OPERATING INSTRUCTIONS for Counter Tube Type G KC1 Standard Compound Experience shows that Geiger-Müller counter tubes have a service life of about 10 years. The service life is reduced in the event of continuous use at intense radiation because the quenching gas in the tube is used up faster. -
Page 6: Differentiation Of Radiation Types
OPERATING INSTRUCTIONS for Counter Tube Type G Differentiation of Radiation Types Differentiation of ALPHA, BETA and GAMMA radiation is relatively easy with regard to ALPHA radiation. ALPHA radiation involves helium nuclei with two positive charges which themselves have a short range even in air - max. 10 cm and usually not more than 5 cm. The ALPHA component of radiation can be determined by 2 measurements using the end window counter tubes (A or G) in which one measurement is carried out with open end window and the other measurement with an open window which is however covered by a thin... -
Page 7: Some More Theory
OPERATING INSTRUCTIONS for Counter Tube Type G Some more theory In nuclear physics radioactive radiation sources are called RADIONUCLIDES. The radiation energy is measured in mega-electronvolt (MeV) or kilo-electronvolt (keV): MEGA = 1,000,000 = 10 or KILO = 1,000 = 10 Where this radiation arrives it is measured in sievert (Sv) or rem, where 100 rem = 1 Sv or 1 rem = 0.01 Sv 0.1 rem = 1 mSv or 0.1 mrem = 1 µSv... -
Page 8: Appendix
OPERATING INSTRUCTIONS for Counter Tube Type G APPENDIX Measuring Table In this measuring table standard emitters are prepared for 6 different nuclides which can be released in any failures in nuclear power stations; these are standard emitters with 100 Bq and 1,000 Bq. -
Page 9: Using The Measuring Table
OPERATING INSTRUCTIONS for Counter Tube Type G APPENDIX Explanatory Notes on Using the Measuring Table As can be seen, the relationship between the impulses of the counter tubes is proportionate to the becquerel values - in other words, the higher impulse rates mean correspondingly higher becquerel values.
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