A BETA-RAY GAGE FOR MEASURING THE THICKNESS OF THIN MAGNETIC TAPE
Technical Report
·
OSTI ID:4189011
A beta-ray thickness gage was developed to measure ultra-thin magnetic tapes without removing them from the roller. The optimum choices of source and detector for this application were determined by a study of available beta emitters and types of detectors. The best source was a linear deposit of 5 microcuries of carbon-14 as sodium carbonate. The best detector was an end window Geiger tube feeding an automatic scaler. The gage was calibrated for molypermalloy tape/ 3/8" wide and from 0.0001" to 0.001" thick. A standard error of plus or minus 1/2% was achieved with counting times of a few minutes. (auth)
- Research Organization:
- Naval Ordnance Lab., White Oak, Md.
- NSA Number:
- NSA-14-005335
- OSTI ID:
- 4189011
- Report Number(s):
- NAVORD-5749
- Country of Publication:
- United States
- Language:
- English
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