ML20004C915
| ML20004C915 | |
| Person / Time | |
|---|---|
| Site: | 07001050 |
| Issue date: | 05/13/1981 |
| From: | Kwadrat C, Oravec C ST. FRANCIS COLLEGE, LORETTO, PA |
| To: | NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| 19110, NUDOCS 8106080035 | |
| Download: ML20004C915 (5) | |
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United States Nuclear Regulatory Commission License Management Branch Division of Fuel Cycle and Material Safety Washington, D. C.
20555 Gentlemen:
This letter is a request for amendments to the Special Nuclear Materials License of Saint Francis College numbered SNM-1003 (Docket No. 070-01050) in accordance with the United States Nuclear Regulatory Commission Regulatory Guide 10.3, section 5, entitled Amendments to a License.
The proposed amendments that follow are in reference to the letter of March 11, 1980 that was filed with your agency by Saint Francis College in making an application for license renewal.
The following amendment is proposed in the radiation protection instrumentation that is available to nonitor and detect radiation as outlined in the second paragraph of section 7 of the license tenewal letter.
In place of the 463A with Alpha Probe Portable transistorized count rate meter and area monitor, Universal Transistor Products Corporation, the following equipment will be made available for radiation monitoring and detection.
Model 8770 Educational Scaler (Nuclear. of Chicago Corporation) with an HP-190 Thin Mica End Window Probe with Alpha-Beta-Gamma Sensitivity (Eberline)
A copy of the manufacturers' specifications for the Model 8770 Educational Scaler and the HP-190 Probe are enclosed with this amendment letter.
f It is proposed that paragraph three of section 7 cencerning the l
calibration of the radiation protection instruments be amended to I
include the following sentences.
The Model 8770 Educational Scaler with the HP-190 Probe will be calibrated against a 0.005 microcurie plutonium-239 alpha source produced and certified against National Bureau of Standards radiation calibration measurement r
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19110 81060.so035 FG ~..h 0
United States Nuclear Regulatory Commission May 13. 1981 Page 2.
r procedures by Eberline.
A fixed geometry configuration will be used between the HP-190 Probe and the plutonium-239 alpha source during the calibration procedure.
This proposed amendment will extend the license to include the possession of the 0.005 microcurie plutonium-239 alpha source.
The final amendment involves the second sentence of paragraph four of section 8 of the license renewal letter.
The sentence will read as follows under the proposed amendment.
The Model 8770 Educational Scaler with the HP-190 Probe is used to detect alpha radiation on the filter pad via the same fixed geometry configuration used in the calibration procedure described in section 7.
Sincerely, t
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(Rev.) Christian R. Oravec, T.O.R.
President
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Carl F. Kwadrat Assistant Professor of Physics CRO:CFK:ak
Enclosures:
Model 8770 Educational Scaler Specifications Model HP-190 Probe Specifications e
' I Model 8770 Eduettional Scaler r
Nuclear of Chicago Corp.
l SECTION I INTRODUCTION I
I GENERAL DESCRIPTION I
The Model 8770 Educational Scaler is an instrument for reliable counting in g
the laboratory or classroom. It accepts the pulses which originate in any I
one of several types of radiation detectors, and accumulates a total count of the pulses which are detected during an experiment. A count accumulation is indicated by the five direct reading decades on the front panel.
The scaler includes a high voltage output circuit to provide the required operating potential to the associated detector. It is compatible with the
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Model 404 Geiger Tube Detector System, the Model 402 Gas-Flow Geiger i
Detector System, and the Models 403 and 405 Scintillation Detector Syrtems.
It may also be used to accept pulses from any alternate similar source.
Convenient connections are included for a timer which may be added for the I
purpose of either control or indication of the duration of a counting interval.
Oscilloscope terminals are also provided to permit monitoring of the input I
circuit and to aid in setting up the proper operating conditions prior to run-ning an experiment.
I The period of counting operation r;ay be defined by either manual or preset-
- g time stop control. The Model 8428 Educational Timer
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either preset time or elapsed time functions. The Model 8420 Dual Timer *
(formerly Model TI) may also be used with the scaler.
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- Models given are for operation on normal 60 cycle power line frequency. For operation on 30 cycles, use Model 8429 in place of the 8428 and Model 8421 in place of the 8420.
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Model 8770 Educational Scaler Ngelsar of Chicago Corp.
SPEclPICATIONS IN P U T S E N S IT IV I TY - Nominal 0. 25 volt across a 20 picofarad g
4 capacitor, or 5 picocoulombs charge-sensitive input.
PULSE P AIR RESOLUTION 10 microseconds.
t' OV E RL O AD R E C OV E R Y - X10 within 5 microseconds; X40 within 10 microseconds.
SCALER C AP ACITY - 99,999 counts miximum.
C OUNTING MECH ANIS M -
1-2-4-8 binary cou.ner, cecoded for 10- line readout I
D IS PL AY - Neon bulb,10 line display for each of five decades.
I LINE TEST - Power line fr?quency test signal supplied internally for checking scaler operation.
I HIG H VOLT AGE SUPPLY - Continuously variable between +400 and +1500 volts. Supplies 50 microamperes maximum at any voltage level. Regulation is within *0.25% for a 5 volt change in the power line input between 105 and 125 volts. Output level selected with direct reading front panel control.
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POWER REQUIRE MENTS - 115 volts i 10%, 50-60 cps,18 watts.
Available for 230 volt operation on request.
DIMENSIONS - 12" wide by 61/2" high by 10" deep overall.
WEIGHT - 20 lbs. net; shipping weight 24 lbs.
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1 5a Hand Probe, Model HP-190 GENERAL DESCRIPTION The Model HP 190 provides additional versatility for any geiger counter.The thin mica window allows monitoring for low energy beta emitting isotopes, and also gives sensitivity to high energy alpha particles.
The HP 190 may be orderd with Eberline G-M counters. such as Models E-120,E-140, E-400,E-520 or E-530,in lieu of the standard probe.However. it does not have the energy compensating shield that some probes,e.g. HP-270,have and is not recommended in applications where the primary purpose is to measure exposure rate (mR/hr).
The 10443-B04 Screen Cap is supphed with the HP-190.This provides protection for the window an.d re-tains the low energy detection capability,but at a reduced efliciency.
T se Model SH 3 Sample Holder may be used with the HP.190 to provide coastant geometry for sample e aunting.
a SPECIFICATIONS OPERATING VOLTAGE: 900 V.
PLATEAU LENGTH: 200 V nominal.
PLATEAU SLOPE: 0.1%/V maximum.
DEAD TIME AT 900 V: 200 useemds maximum.
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OPERATING TEMPERATURE RANGE: - 55*C to +75*C.
y LIFE: Unaffected by operation.
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MICA WINDOW THICKNESS: 1.4 to 2 mg/cm.
MICA WINDOW DIAMETER: I-1/8 inches (2.86 cm).
CAnlODE MATERIAL: Stai:lless steel.
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GAMMA SENSITIVITY (' 8 'Cs): Approximately 2500 counts per minute (cpm) per mR/hr.
' BETA EFFICIENCY (1 inch dia. source):
3 "Sr."Y(E,,x.54 -2.2 MeV): Approximately 45% of 2a emission rate.
0 "Tc (E,,g0.29MeV): Approximately 30% of 2a emission rate.
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.g 8*C (E,,,0.15 MeV): Approximately 10% of 2r emission rate.
SIZE: 1-3/8 inches dia. x 5 3/4 inches long (3.5 x 14.6 cm).
l WEIGHT: 8 ounces (230 g).
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CONNECTOR: BNC series coaxial.
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' Measured without screen cap.With cap in place, efficiency will be approximately 1/2 of that listed.
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- i NO7E: The saturttion specification of Eberline geiger counters is not applicable when an HP 190 is und s- '
in place of the HP 270.
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.a ObOf O FO. Box 2108,Senta Fe,New Mexico 87501005)471-3232 e
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January 1978 1
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