Models SRJ-7 and HRJ-7 Juno Survey Meters

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Models SRJ-7 and HRJ-7 have similar circuits, the principal difference being the value of grid resistances used. Radiation incident upon the ionization chamber produces a minute current which flows through a very high resistance in the grid circuit of the electrometer tube. The voltage thus produced at the grid causes a corresponding change in plate current which is indicated by the panel meter. A bucking current is provided through the meter in order that the no-signal plate current of the electrometer may be balanced out and readings of radiation intensity may start from the meter zero reading. Sensitivity is varied by switching appropriate values of grid resistance in the electrometer circuit. The instrument is calibrated by adjusting a resistance in series with the meter. An individual adjustment is provided for each range. Zero setting is accomplished by means of a rheostat in the filament circuit of the electrometer tube. By varying the filament voltage, the plate current may be varied and thus adjusted to a value equal to the bucking current flowing through the meter. All high resistance points in the circuit are insulated with Teflon to insure minimum leakage. SENSITIVITY. Both models are calibrated in three separate full-scale ranges in easily read increments of the meter scale, covering the total range of which the instrument is capable. Ranges are based on radium gamma radiation intensity. Accuracy of calibration is such that indications on the meter will not be more than 5% lower nor more than 10% higher than the radiation intensity to which the chamber is exposed. For use in abnormal environmental conditions, air temperature and density correction data and curves are included with each instrument. Sensitivity dependency upon battery aging is limited to a 10% variation while the unit can be zei,oed by means of the panel zero control. SPEC1 FICATIONS : IONIZATION CHAMBER: Volume: 27 cubic inches. Window Opening: 3” x 4%”. Alpha Window: 0.3 mil (0.45 mg/cm’) rubber hydrochloride. Alpha Absorber: 0.01” cellulose acetate sheet. Beta Absorber: 0.102” aluminum. BATTER I ES: 4 Eveready No. 412 22% Volt “B” Batteries. 2 Eveready No. E12 1.35 Volt “A” Batteries. 2 Mallory No. TR-115 6.5 Volt “B” Batteries. TUBE: 1 Sub-Miniature Electrometer Type CK 5886. RANGES: Model SRJ-7 Juno (standard range): 50, 500, 5000 MR/HR full-scale. (Improved A.E.C. Model SIC-17B). Model HRJ-7 Juno (high range): 250, 2500, 25,000 MR/HR full-scale. (Improved A.E.C. Model SIC-17D). TIME CONSTANTS: 50 MR/HR - 18 Seconds 500 MR/HR-4 Seconds 5000 MR/HR-2.5 Seconds OPERATING TEMPERATURE RANGE: 35°F to 135°F CASE: Hard-chrome plated aluminum, with engraved markings on top of case; gasketed, dust and moistureresistant. Dimensions: 9%” x 5%” x 4“. HANDLE: Aluminum, especially cast low-porosity, smoothly polished. WEIGHT: Net 6 Ibs. 11 oz. Shipping: 10 Ibs. Illustration below shows the T/A Juno in use at the Nuclear Radiation Laboratory of Admiral Corporation, monitoring for radio-activity as sample is transferred from “coffin” to shipping container. The Juno can be used for X-ray detection and measurement by reference to the above curves. TECHNICAL ASSOCIATES
~ __ ~- JUNO RADIATION SURVEY METER Models SRJ -6 and HRJ -6 * - ~ 0 e - 0 Y E C H N I C A L ASSOCIATES- INSTRUMENTATION FOR NUCLEAR RESEARCH 140 WEST PROVIDE14CIA AVENUE BURRANK CALlFORNlA t
Page 1 and 2: I MANUAL OF OPERATION JUNO RADIATIO
Page 3 and 4: MANUAL OF OPERATION JUNO RADIATION
Page 5 and 6: 1 . GENERAL DESCRIPTION MANUAL OF O
Page 7 and 8: SUPPORTED BY AN ANTI-VIBRATION TUBE
Page 9 and 10: SRJ-7 HRJ-7 V. CALl8RATlON CONS1 DE
Page 11 and 12: JUNO MODEL 7 PARTS LIST R 1 STANDAR
Page 13 and 14: I------------- SHIELD -1 I a I v- I
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Page 20 and 21: MANUAL OF OPEWTION e JUNO RADIATION
Page 22 and 23: Tube : Ranges : 1 each Sub-Miniatur
Page 24 and 25: 75 micro amps also. These two curre
Page 26 and 27: indications on the meter will not b
Page 28 and 29: TECHNICAL JUNO MODEL 6 ASSOCIATES P
Page 30 and 31: TECHNICAL ASSOCIATES BURBANK, CALIF
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Page 36 and 37: Bulletin No 167 INSTRUMENTATION FOR
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Page 40 and 41: T E C H N I C A L ASSOCIATES INSTRU
Page 42 and 43: 7 . PRICE LIST (Continued) C-2b c-l
Page 44 and 45: PRICE LIST IN GENERAL Unit prices a
Page 46 and 47: P ECI F I CAT1 ONS RADIATION RANGES
Page 48 and 49: for use with Technical Associates S
Page 50 and 51: PECIFICATIONS MODELS DS-5B and DS-5
Page 52 and 53: ALOGEN QUENCHED permanently sensiti
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Page 56 and 57: Bulletin No. 162 162 162 162 162 16
Page 58 and 59: T E C H N I C A 1 ASS0 C I AT E S 1
Page 60 and 61: Bu//etin No. 159 & INSTRUMENTATION
Page 62 and 63: Bulletin No. 159 MODELS SRJ-6 and H
Page 64 and 65: Bullefin No. 185 INSTRUMENTATION FO
Page 66 and 67: 4-DIGIT SODECO REGISTERS CLOTHING P
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HIGH VOLTAGE POWER SUPPLY MODEL RHV
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! - ALOGEN QUENCHED permanently sen
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FROM: NUCLEAR CORPBRATPON OF AMERIC
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L . . . PRICE LIST TECHNICAL ASSOCI
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PRICE LIST (Continued) Bulletin No
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Bulletin No. 189 189 189 189 189 Mo
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Bulletin No. 206 UNIVERSAL LEAD SHI
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Bultetin No. 783 ,./ 0 Built-in tra
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& FRISKER-MONITOR, u MODEL FM-1 0 I
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Bullefin No. 205 GAMMA SCINTILLATIO
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Bulletin No. ?80 INSTRUMENTATION FO
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Bulletin No. 187 INSTRUMENTATION FO
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Bulletin No. ?89 INSTRUMENTATION FO
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Bulletin No. 182 204 204 204 204 20
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Bulletin No. 168 168 168 168 168 16
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.- /" ,,/ NUCLEAR INSTRUMENT & CHEM
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~ 5, The plug-$n Geiger tube (mode%
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csPBide with %he atoms of gas in &h
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CA.LIBUTION COE1RECTI[QNS * A plo%
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G.M. TUBE CK 1020 i TUBE SGKET TUBE
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3e The %op piece may be folded to o
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falls to the background value, the
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BATTERIES B1 B1 B3 RESISTORS SECTIO
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w. BULLETIN V-4010 $ micro- microam
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model V multiple range model Model
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the Analyzer January 1965 Volume VI
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i L Beckm a n 1 . . ~ C , . D . * O
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1 Fire-gas analyzer used in trainin
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J Infrared spectrophotometers and r
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the instrument range. At the 400 cm
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1 3 9 4 4 1 3 4 5 2 4 13 3 2 8 3 2
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I 3 1 11 4 1 5 1 1 5 4 2 11 1 2 14
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t - ... t Literature New literature
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c BUSINESS REPLY MAIL No postage st
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HoodFoomNo. 1 It fl 3-53 h
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I Beckman./ Pnst ructions I BECKMAN
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Section 1. INTRODUCTION A. DESCRIPT
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1 - 2% 8 10- CURRENT 10-9 10-l' 11
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Section 2. INSTALLATION A, SPACE RE
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2. Cable for Recorder. To connect t
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Section 3, OPERATION A. OPERATING C
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e difficult to obtain permanent adj
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Section 4. MAINTENANCE A. EQUIPMENT
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a. Connect a known current of amper
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d. Use small radium source to adjus
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I-i E. F. Johnson I 1.105- 520 P I
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amplifier behaves like a high-gain
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The change in voltage necessary to
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Syinbo 1 Section 6. PARTS LIST De s
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I I------- AMPLIFIER UNIT REGULATED
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OPERATING P ROC E D U RE Without th
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COLLECT PREPAID 1 DATE SHIPPED SHIP
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SECTION I OPERATION Figure 1. Model
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6. METER Indicates the magnitude of
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SECTION II MAINTENANCE c* II I&l In
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- Input Signal Current R1 To Input
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7. FEEDBACK CIRCUIT The filtered vo
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E. CURRENT CALIBRATION The current
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Symbol Description Beckman Part c1
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Models SRJ-7 and HRJ-7 Juno Survey Meters

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