Order number page 19 940406-171827 set 5 with ‘OFFICIAL BSE ONLY pressure time information in the moderate to high pressure region from the detonation of twol500-ton hemispherical TNT charges. Field testing of new instrumentation systems for Operations Bass Drum and Distant Plain was carried out in fulfillment of Project 1.4 objectives. Electronic and self-recording 801. KEYWORD (S) instrumentation systems were used to record the air blast parameters along the land surface in the range from 20 to 9000 feet from ground zero. The air blast data was found to correlate with Operation Snow Ball; minor deviations occurred in the low pressure region where wind conditions altered the magnitude of the blast wave. SAILOR HAT/instrumentation ;SAILOR HAT/blast measurements ; INSTRUMENTATION; BLAST WAVES; TNT;MIDGET DISTANT PLAIN; SNOW BALL Item 150. 110. 70. 710. FLY; 32 REPORT NUMBER PRIMARY TITLE (M) _ 5.1: WT--28 Development of the Chemical Corps dosimeter. Annex Annex C [of] scientific director’s weapon tests at Eniwetok, PERSONAL AUTHOR (M) CORPORATE SOURCE Wilson, G.B. 1951. report of atomic Operation Greenhouse Chemical and Radiological Labs., Army Chemical Center, MD (USA) 371. PUB. DATE (YYMMDD) 520100 34. CLASSIF. LEVEL TEXT Unclassified 950. ABSTRACT The development of the Chemical Corps color-changing radiation dosimeter to be tested in Operation Greenhouse is summarized. The absorption of radiation by moist chloroform results in the formation of hydrochloric acid which in turn produces color changes in the alkaline indicator dyes, neutral red (NR) and the potassium salt of tetrabromophenolphthalein ethyl ester (TBP). Two different types of dosimeters, which are identical in construction, were developed. The more sensitive type or low range dosimeter uses NR as an indicator and covers the dosage range from 50 r to 400 r in four steps while the slightly less sensitive high range dosimeter uses TBP as an indicator and covers the dosage range from 100 r to 600 r in four steps. Each instrument consists of an aluminum container containing four neutral glass bottles with plastic scfew caps. Each cap is colored to match the bottle contents after the dosage indicated by the bottle has been received. The aluminum container consists of a double tube arrangement which permits four small windows to be opened or closed by rotation of the inner tube. Details for the preparation of chemicals are given. 5003393 OFFICIAL USE ONLY