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HOW TO PMCS AND OPERATE RADIOLOGICAL DETECTOR. STANDARDS: Be able to perform a PMCS and operate AN/VDR-2 Radiac Set. Prepare Radiac Set in accordance.

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Presentation on theme: "HOW TO PMCS AND OPERATE RADIOLOGICAL DETECTOR. STANDARDS: Be able to perform a PMCS and operate AN/VDR-2 Radiac Set. Prepare Radiac Set in accordance."— Presentation transcript:

1 HOW TO PMCS AND OPERATE RADIOLOGICAL DETECTOR

2 STANDARDS: Be able to perform a PMCS and operate AN/VDR-2 Radiac Set. Prepare Radiac Set in accordance with TM and stating the contamination reading obtained from an area survey, personnel monitoring, and equipment monitoring.

3  DESCRIPTION:  1. Use to locate and measure gamma and beta particles.  2. Lightweight, battery operated, and self testing.  3. Measurement is in Gy (unit of Gray)  4. cGy - centigray, Gy – Gray, and uGy – microgray.  5. Negligible risk factor is 1 cGy.  WARNING!!!! The high range detector contains one (1) nanocurie of Thorium (th) 232, and is controlled by U.S. Army Reg

4  RADIACMETER  PROBE  POUCH  STRAP

5  1. Detects, measures, and displays level of gamma radiation dose rate from.01 uGy/hr to 100 Gy/hr.  2. Detects and displays level of beta particles dose-rate from.01 uGy/hr to 5 Gy/hr.  3. Measures, stores, and displays accumulated dose (total dose) from.01 uGy to9.99 Gy.  4. Flashing display to indicate reduced accuracy condition when measuring dose rate from 10 Gy/hr.

6  1. Liquid Crystal Display (LCD): 3 digits decimal point Unit of measurement Indicates low batteries or fault  2. Can be vehicle mounted  3. Audible or visual alarm independently preset for dose rate and accumulated dose.

7  1. Main power- 3 ea (9 volt batteries).  2. Vehicle power- 24 VDC.  3. Main power battery life- 100 hrs.  Will retain memory for 5 min. after batteries are removed volt batteries

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10  1. Low battery indicator (flashing/hr).  2. Decimal indicators.  3. Digits.  4. Dose units.

11  Routine Checks: A. All cables. B. Loose or broken lights or covers. C. Inspect panel. D. Remove all foreign debris. E. Inspect batteries and compartment.

12  1. The AN/VDR-2 must be turned off when disconnecting/charging probes or batteries.  2. Install batteries.  3. Install meter in pouch.  4. Conduct pre-operational test.

13  1. Set power to ON.  2. Set ALM to AUD.  3. Press and hold CLR/TEST button until alarm sounds for 2 seconds, then release.  4. When the segment displays, insure it is exactly as shown uGy55.5 cGy 11.1 uGy666 cGy 222 uGy77.7 Gy.333 cGy888 Gy 4.44 cGy999 Gy

14  5. Set ALM to off, then VIS. The dose rate lights will come on.  6. Once the segment test is complete the unit will automatically go through the unit/digit test and electrical test.  7. If all tests are ok, you will see a flashing “9”.  8. If there is a fault, you will see a flashing “8”.  9. Once you see the flashing “9”, press the CLR/TEST button.  10. Tests are complete.

15  1. Surveying for beta/gamma contamination. A. Stand in an open area, 10 meters from any shielding objects. B. Hold unit waist high. C. Slowly turn in a full circle. D. Record highest reading received.  There are 2 types of monitoring procedures. Direct  Outside of any shielding objects. Indirect  Stand in middle of room or area and do testing.

16 Step 1 (b) 360 ° 10 Meters 360 °

17  Simplest and most precise type of monitoring.  Consists of unshielded dose rate readings.  Used when conditions and Operational Exposure Guidance (OEG) permit

18 Step 2 (b) 360 ° Center

19  Measure dose rates within an area shielded from radiation.  Allows the unit to measure radiation levels and still keep exposure to a minimum.  Preferred method when operating in a contaminated area.

20  2. Determining Background Radiation. A. Turn or walk away from the suspected contamination. B. Open beta shield. C. Observe reading for 5-10 sec. Record highest reading. D. Multiply by 2. E. If the reading is twice background or higher, contamination is present. F. Report the results.

21  4. Monitoring personnel. A. Take background. B. Have the person being monitored stand with feet apart, and arms extended with palms upward. C. Hold probe 1 inch from personnel. D.. Pass over entire body, starting with the head. E. Any reading above the background is contaminated.

22 Contamination: Before something can be considered contaminated, a reading 2 times higher than the background must be obtained.

23  Your background reading is 2 uGy/hr; multiply by 2 which gives you 4uGy/hr. Your open shield reading is 3 uGy/hr and the closed shield reading is 3 uGy/hr. Both readings were not twice the background, therefore. No contamination is present.

24  Beta Only- Your background reading is.2 uGy/hr times 2 is.4 uGy/hr. Your open shield reading is 2.5 uGy/hr which is more than twice the background reading. The closed shield reading is.2 uGy/hr. It is not twice the background, therefore, you have beta only.  Both Beta & Gamma Contamination- Your background reading is.2 uGy/hr times 2 is.4 uGy/hr. Your open shield reading is 3.4 uGy/hr which is more than twice the background reading. The closed shield reading is 2.2 uGy/hr. It is also twice the background. Therefore, you have both beta and gamma radiation present.

25 QUESTIONS??


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