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  • 1
    ISSN: 1432-0495
    Schlagwort(e): Key words Petroleum wastes ; Laser-induced fluorescence ; Cone penetrometer ; In-situ sensors
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie
    Notizen: Abstract  The Site Characterization and Analysis Penetrometer System (SCAPS) was used to investigate subsurface petroleum contamination at Aberdeen Proving Ground, Maryland. The SCAPS is a rapid site-screening tool developed by the Tri-Services (U.S. Army, Navy, and Air Force) to reduce the cost of installation restoration activities. The system, consisting of a geophysical cone penetrometer fitted with a laser-induced fluorescence petroleum sensor, is capable of simultaneous, real-time delineation of subsurface stratigraphy and petroleum contamination. Onsite processing of the SCAPS data allows three-dimensional visualization of both subsurface stratigraphy and petroleum contaminant distribution. The site investigation described herein successfully identified three distinct areas of subsurface petroleum contamination caused by leaking underground storage tanks containing No. 2 healing oil. The SCAPS petroleum sensor response was verified by obtaining 20 soil samples and performing onsite and conventional laboratory analyses for petroleum contaminants. Verification sample results indicate a strong correlation between the SCAPS fluorescence data and conventional measures of petroleum contamination. This investigation illustrates the capabilities of the SCAPS for rapid site characterization.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Lasers in medical science 11 (1996), S. 155-161 
    ISSN: 1435-604X
    Schlagwort(e): Photodynamic therapy ; Interstitial ; Dunning R3327 prostate tumour ; Threshold light dose ; Cylindrical diffuser ; Diffusion theory
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin , Physik , Technik allgemein
    Notizen: Abstract Interstitial photodynamic therapy (PDT) could be an alternative radical treatment for prostate cancer. The ability to predict the depth of necrosis is necessary for light treatment planning using multiple optical fibres. The extent of PDT necrosis was studied in subcutaneously implanted R3327-AT6 Dunning prostate tumours which had similar optical characteristics to human prostate. Tumour-bearing subjects were given 20 mg kg−1 Haematoporphyrin esters (HPE) and irradiated 24 h later with 630 nm laser light. Five subjects per group were treated with increasing light doses (50–450 J cm−1) delivered interstitially via a single 2 cm long cylindrical diffuser. After 450 J cm−1 of irradiation, 4.3±0.8 cm3 [standard error of the mean (s.e.m.)] of tumour tissue was necrosed to a depth of 10.5±0.8 mm around the diffuser. There was an approximately linear correlation between the volume of PDT necrosis around the fibre and prescribed light dose. The mean threshold light dose for PDT effect was 18±2 J cm−2. In this tumour with a mean photosensitizer concentration of 16±1.5μg g−1, low light doses produced tumour necrosis. PDT using multiple diffusers could destroy a relatively large tumour volume and the ‘diffusion theory’ model reliably predicted the depth of necrosis.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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