Method and apparatus for monitoring the concentration of airborn

Details Method and apparatus for monitoring the concentration of airborn Method and apparatus for monitoring the concentration of airborn

1986-11-24

1989-02-28

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Semiconductor system

25037006, 250304, 250435, G01T 136, G01T 124

Patent

active

048088277

ABSTRACT:
The permissable level of radioactivity due to airborne actinides is extremely low: the satisfactory discrimination of actinide emissions from other sources is, consequently, a problem. This specification discloses the combination of (a) selecting only the larger airborne particles, (b) measuring the activity of emissions at the energy characteristic of actinide decay of these particles and (c) decay analysis of the measurements to reject emissions which are characteristic of high energy processes but which have lost sufficient energy to fall within the measurement band.

REFERENCES:
patent: 2892091 (1959-06-01), Sawle
patent: 4286155 (1981-08-01), Utting
patent: 4442358 (1984-04-01), Kreiner
patent: 4607165 (1986-08-01), Burghoffer
Rusch et al, "The ZPR-9 Airbourne Plutonium Monitoring System", IEEE Trans. Nucl. Sci., NS-23 (1), pp. 690-693, Feb. 1976.
Kordas et al, "A Review of Measurement Techniques for Stack Monitoring of Long-Lived Alpha Emitters", IEEE Trans. Nucl. Sci., NS-26 (1), Feb. 1979, pp. 757-764.

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