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Title:
METHOD FOR MEASURING CONCENTRATION OF DUST POWDER BY TRANSMITTING BETA RAYS
Document Type and Number:
Japanese Patent JPS58171652
Kind Code:
A
Abstract:

PURPOSE: To flatten a frequency distribution curve and to enhance measuring accuracy and sensitivity, by using a β-ray source and a detector both in specified structures.

CONSTITUTION: A β-ray source 3 is furnished with a ray source collimator 4 having a window 5 and a prescribed thickness, and a ray source filter 6 made of a thin metallic plate. A β-ray detector 9 arranged with a filtering material 7 between is provided with a detection collimator 10 having a window 11 and a prescribed thickness like the collimator 4. As a result, a flat part is formed on the spectral curve of the β-rays emitted from the source 3 toward the detector 9. A setting level of a wave height discriminator 15 is fixed in the region of this flat part, and the intensity of the rays transmitted through the material 7 before and after collection of dust powder. Prescribed calculation is made in a signal processor 16 to obtain the thickness of the dust powder layer deposited on the material 7, thus permitting enhancement of measurement accuracy and sensitivity.


Inventors:
MORI MASAKI
ISHIKAWA RIYOUICHI
ARAI SOMEYOSHI
Application Number:
JP5411982A
Publication Date:
October 08, 1983
Filing Date:
April 01, 1982
Export Citation:
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Assignee:
DENKI KAGAKU KEIKI KK
International Classes:
G01N9/24; G01N23/06; (IPC1-7): G01N23/06
Domestic Patent References:
JPS55162146U1980-11-20
Attorney, Agent or Firm:
Yoshimi Hatanaka



 
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