1、MIL-R-28883 66 7797706 0336520 7 .- .- -, MIL-R-28881( EC) 26 March 1984 Beneficial comments (recommendations, additions, delet ions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Naval Electronic Systems Command (ELEX-8111), Washington, DC
2、20363, by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document, or by letter. MILITARY SPECIFICATION RADIACMETER, IM-239/WDQ This specification is approved for use by the Naval Electronic Systems Command, Department of the Navy,
3、and is available for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers the design and test requirements for the IM-239/WDQ Radiacmetenr Monitor for Radioactive Particles, hereinafter referred to as the radiacmeter. 2. APPLICABLE DOCUMENTS
4、 2.1 Government documents. 2.1-1 Specifications, standards, and handbooks. Unless otherwise specified, the following specifications, standards, and handbooks of the issue the listed in that issue of the Depart- ment of Defense Index of Specifications and Standards (DoDISS) specified in the solicitat
5、ion form a part of this specification to the extent specified herein. SPEC1 FICAT IONS MIL I TARY hIL-A-15303 MIL-E-16400 MIL-E-17555 MIL-R-28760 STANDARDS h1 L ITARY MIL-STD-12 MIL-STD-108 MIL-STD-109 MIL-STD-415 MIL-STD-461 MIL-STO-462 MIL-STD-781 MIL-STD-810 MIL-STD-965 MIL-STD-1364 DoD-STD-1399,
6、 Section 300 Audible Signals: Alarms, Bells, Buzzers, Horns, Sirens, And Electronic Shipboard Electronic, Interior Communication And Navigation Equipment, Naval Ship And Shore: General Specifi- cation For Electronic And Electrical Equipment, Accessories, And Repair Parts; Packaging And Packing Of Ra
7、di acmeter, Air Particle Detector, IM-l92/WDQ Abbreviations For Use On Drawings, And In Specifi- cations, Standards And Technical Documents Definition Of And Basic Requirements For Enclosure For Electric And Electronic Equipment Quality Assurance Terms And Definitions Test Provisions For Electronic
8、Systems And Associated Equipment, Design Criteria For Electromagnetic Emission And Susceptibility Requirements For The Control Of Electromagnetic I nt erference E 1 ectromagnet i c I nt erf erence Character ist ics , Measurement Of Reliability Design Qualification And Production Acceptance Tests: Ex
9、ponential Distribution Environmental Test Methods And Engineering Guide1 ines Parts Control Program Standard General Purpose Electronic Test Equipment Interface Standard For Shipboard Systems, Electric Power, Alternating Current (Metric) Licensed by Information Handling ServicesMLL-STD-1472 DoD-STD-
10、1679 MS 16 1 42 Human Engineering Design Criteria For Military Systems, Equipment And Facilities Software Development Boss, Gasket Seal Straight Thread, Tube Fitting; Standard Dimensions For HANDBOOKS MI L ITARY MIL-HDBK-241 Design Guide For EM1 Reduction In Power Supplies (Copies of specifications,
11、 standards and handbooks, required by manufacturers in connection with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting officer.) 2.2 Other publication. The following document forms a part of this specification to the extent specified
12、herefn. The issue of the document which is indicated as DoD adopted shall be the issue listed in the current DoDISS and the supplement thereto, if applicable. NATIONAL FIRE PROTECTION ASSOCIATION (NFPA) NFPA- 70- 1983 National Electrical Code (Application for copies should be addressed to the Nation
13、al Fire Protection Association, (Industry association specifications and standards are generally available for reference from 2.3 Order of precedence. 470 Atlantic Avenue, Boston, MA 02210.) 1 ibraries. They are also distributed among technical groups and using Federal agencies .) and the references
14、 cited herein, the text of this specification shall take precedence. In the event of a conflict between the text of this specification 3. 3 .I herein. 3.1 (see 4.3 3.2 radioact and accu REQUIREMENTS General. The radiacmeter shall be in accordance with MIL-E-16400 to the extent specified 1 First arti
15、cle. When specified, a sample shall be subjected to first article inspection and 6.3). The radiacmeter is a detection and monitoring system for ve particles suspended in the air. The radiacmeter is to be used whenever a continuous ate measurement of radioactive air particulate is required to ensure
16、that these radiation levels remain within safe levels. Airborne particles of a certain size containing radiation- emitting alpha and beta particles are of the greatest concern. The radiacmeter shall be designed to have its greatest sensitivity to beta radiation, as specified herein, while discrimina
17、ting against a gamma background. Any sensitivity to alpha particles is desirable and shall be retained in the design whenever possible. the radiacmeter because such measurements are to be provided by other equipment. Radiacmeter description. Radioactive gas measurement shall not be a primary functio
18、n of 3.2.1 Radiacmeter definition. The requirements specified in 3.2.1.1 through 3.2.2.2.4 3.2.1.1 Radiacmeter diagrams. The radiacmeter outline dimensions shall be as specified in identify the radiacmeter and its relationship to the environment. FIGURE 1. The mounting dimensions shall be as specifi
19、ed in FIGURE 2. 3.2.2 Interface definitions. Interface definitions shall be as specified in 3.2.2.1 through 3.2.2.2.4. 3.2.2.1 Internal interfaces. The significant internal interfaces shall be designed to minimize electrical interference and to provide proper load and source matching. Mechanical int
20、erfaces shall be designed to optimize the performance of the subsystems. Size constraints shall be considered in laying out and arranging the mechanical and electrical design. 2 Licensed by Information Handling ServicesL - - - MIL-R-2BL 66 W 3777706 0336522 2 MIL-R-28881 (EC) - n W W u x W O c !3 -
21、+I 9 pz - r O +I -I O I- -m 1 O 9 t hl Licensed by Information Handling Services3. _- MIL-R-281 66 m 7779706 0136523 4 m MIL-R-28881( EC) 2 3/32 TOL B f 1/32 .f.031“ DIA. HOLES (FRONT) BOTTOM VIEW NOTE: Dimensions are in inches. FIGURE 2. Radiacmeter IM-239 location and size of mounting holes. 3.2.2
22、.2 External interface. External interface shall be as specified in 3.2.2.2.1 through 2.2.4. 3.2.2.2.1 Power. Power shall be 115 volts (V), 60 hertz (Hz) I10 percent, Type I in accor- dance with DoD-STD-1399, Section 300, 10 amperes (A) maximum running current. 3.2.2.2.2 Remote alarm. The remote alar
23、m relay connections and power requirements shall be as specified in a through c: a. Reiay normally closed (NC) 115 V alternating current (VAC): 5 A alarm contact b. Relay normally opened (NO) 115 VAC: 5 A alarm contact c. 115 VAC: 0.4 A remote alarm power A jack and a connector shall be provided sub
24、ject to procuring agency approval for external interface and the jack shall be located near the power connector. 3.2.2.2.3 Air inlet and outlet ports. The location of air inlet and outlet ports shall be as specified in FIGURE 3. Air inlet and outlet ports shall be clearly marked. 3.2.2.2.4 Space req
25、uirements. Space requirements shall be as specified in FIGURE 1, 3.3 Characteristics. Characteristics shall be as specified in 3.3.1 through 3.3.1.12. 3.3.1 Performance. The radiacmeter shall be designed for optimum response to airborne particulate. emitting beta radiation. Radiacmeter detector sens
26、itivity to alpha particles shall be retained wherever possible. All trade-off decisions between alpha and beta sensitivity shall receive concurrence from the procuring activity before incorporation in the design. 3.3.1.1 Range of response. The radiacmeter shall respond to beta particles over a range
27、 of energies. (Sr) 90 and yttrium (Y) 90. Response to other isotopes having end points beta between 0.3 megaelec- tronvolts (MeV) and 5.0 MeV shall be between 60 percent and 150 percent of the response to Sr 90 and Y 90. Response to cobalt (Co) 60 shall be at least 60 percent of the response to stro
28、ntium 4 Licensed by Information Handling ServicesMIL-R-28881 bb 9 779970b 0136524 b MIL-R-28881( EC) t-17-00 TOL c 10.25“ NOTE: Dimensions are in inches. 1 7/8-14 URF-28 (IN ACCOROAHCE WITH MS16142) FIGURE 3. Radiacmeter 114-239 XN-1/WGS location of air inlet and outlet ports. 3.3.1.2 Sensitivity. T
29、he radiacmeter shall have a sensitivity to Co 60 source of 8 x 10- 11 micro-Curies per milliliter (pCi/ml) at the 95 percent confidence level. The measurement shall be made in a sampling time of less than two hours. 3.3.1.3 Accuracy. The radiacmeter shall have an overall accuracy of f20 percent at a
30、nd above actual measured radiation levels of 3 x lo- pCi/ml with a 95 percent confidence level. within 10 percent. at the 95 percent confidence level for actual sample beta radiation at and above 8 x lo- pCi/ml. 3.3.1.5 Alarm. 1 meter (m) from the unit. when the signal exceeds the alarm threshold. t
31、hreshold at any range point from 3 x lo- to 8 x any special tools (see 6.4) in unit steps such as 3 x lom1 to 4 x lo- and so on up to 8 x The alarm sounding mechanism shall be selected from MIL-A-15303. error shall not exceed +lo percent from actual radioactivity for each decade of range. range shal
32、l run from 1 x 10-l to 8 x in the last range from 1 x being read on the front console. 3.3.1.4 Precision. The reproducibility of the system for any given measurement shall be This requirement holds for a period of at least one week after calibration The audible alarm shall produce a sound of 85 deci
33、bels (dB) to 90 dB at A visual alarm indication shall also be used. The alarm shall activate The operator shall be capable of adjusting the alarm pCi/ml at the front console without 3.3.1.6 Operating range. The range of detection shall be linear such that the total system The operating pCi/ml, and i
34、15 percent pCi/ml, from 1 x to 1 x to 1 x pCi/ml. Any reading within this range shall be capable of 3.3.1.7 Res onse time. The system shall reach 75 percent of final response to a 3 x 10-l pCi/ml of Co 6bty within 60 minutes. 3.3.1.8 Operating background. The radiacmeter shall operate in a uniform g
35、amma background of 30 milliroentgens per hour. The energy of this gamma radiation shall be equal to or greater than that produced by Co 60. A background of 30 milliroentgens per hour shall result in no more than one false alarm in 5000 hours with the alarm set at 3 x 10-l“ pCi/ml and the actual acti
36、vity of less than 8 x is desirable. pCi/ml. A minimum alarm response to 40 milliroentgens per hour - 5 Licensed by Information Handling ServicesMIL-R-28881 66 m 7777706 0136525 8 m MIL-R-28881( EC) 3.3-1.9 Calibration. Calibration shall be built into the radiacmeter. The operating range point for ca
37、libration shall be selected to be near the midrange of the radiacmeter. An actual radioactive calibratipn source, which is automatically introduced in front of the detector, shall be used. The calibration source shall be a pure beta emitter with a stable daughter product such a technetium (Tc) 99 wh
38、ich is nearly equal to Co in beta end point energy and shall have an activity less than one-tenth the amount that would require Nuclear Resu1ator.v Commission (NRC) license-. source. The operation of the pump may be stopped orbypassed during”expos for example, the actual maximum peak voltage that th
39、e component experiences shall be not greater than 0.5 times the specification voltage. actual wattage of the component in the circuit shall be not greater than 0.5 times the specifi- cation wattage rating as calculated for the ambient condition. and procedures acceptable togthe Government for stress
40、 derating of electrical and mechanical parts. temperature, strain, and so forth, as applicable for each part type. Procedures shall be implemented which will ensure that the established derating criteria are adhered to during the design process. 3.4.1.3 Resistors. Resistors shall be derated at least
41、 50 percent; for example, the 3.4.1.4 Stress deratin . The contractor shall establish and maintain specific criteria Criteria shall be stated in terms of applied versus rated voltage, power, junction 3.4.1.5 Parts control. 3.4.2 Electromagnetic compatibility (EMC). The radiacmetershall conform to th
42、e requirements The parts to be incorporated in the equipment shall be controlled in accordance w+th MIL-STD-965, Procedure I. of MIL-STD-461, Class A4, above-deck test equipment, with the exceptions specified in a and b: a. CS06. In addition to the 400-V test, a 100-V peak with 0.5 millisecond width
43、 b. RS03. Upper test frequency shall be 40 gigahertz (GHz). shall be applied at a repetition rate of 360 pulses per second. MIL-HDBK-241 may be used for guidance in EM1 reduction in power supply design. 3.4.3 Thermal design. The thermal design shall be in accordance with MIL-E-16400. 3.4.4 Identific
44、ation and marking. cation and marking paragraph of MIL-E-16400. Identification and marking shall conform to the Identif- 8 Licensed by Information Handling Servicesr MIL-R-28881 66 777770b 0136528 3 MIL-R-28881( EC) 3.4.5 Workmanship. Workmanship shall be as specified in 3.4.5.1 and 3.4.5.2. 3.4.5.1
45、 General workmanship. Workmanship and soldering shall conform to the requirements of MIL-E-16400. 3.4.5.2 Workmanship screen. 2 3.4.6 Interchangeability. Major assemblies specified in 3.4.9 shall be interchangeable. 3.4.7 Safety. 3.4.7.1 Radiacmeter power connections. All production radiacmeters pro
46、duced in accordance with this specification shall withstand a defect detection vibration screen of random type vibration at 0.049 /Hz I3 dB from 80 Hz to 350 Hz and temperature cycling as specified in 4.5.16.2.2. Adjustment and calibration shall be allowed after an interchange has been made. of MIL-
47、E-164mcept as specified in 3.4.7.1 through 3.4.7.10. and interconnecting alternating current power cable connectors between radiacmeters shall have radiacmeter shall be as follows: Safety requirements shall be in accordance with the Safety criteria paragraph Radiacmeter power connectors for 115 VAC
48、input power only three pins designated A, 6, and C. Pin assignment and conductor color code within the Pin designation Conductor ass i gnment A B 115 VAC return Safety ground C 115 VAC high (hot) Color code White or light blue Green or green with Black or brown yellow stripe Black or brown and white
49、 or light blue color code shall be maintained from the input connector pins to all components having the same voltage and frequency as the input power. to the Circuit breakers and Fuses and fuseholders paragraphs of MIL-E-16400. shall be connected in series with each ungrounded conducter as determined by the National Electrical Code (see NFPA 70-1983) for grounded source power and shall be connected on the load side of the ON-OFF power switch. The ON-OFF switch may be the circuit breaker. 3.4.7.2 Circuit breakers and fuses. Circuit breakers and fuses and
