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James T. (Tom) Voss Los Alamos National Laboratory Health Physics Measurements Group (RP-2) Radiation Instrumentation and Calibration Team Thermo RadEye.

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Presentation on theme: "James T. (Tom) Voss Los Alamos National Laboratory Health Physics Measurements Group (RP-2) Radiation Instrumentation and Calibration Team Thermo RadEye."— Presentation transcript:

1 James T. (Tom) Voss Los Alamos National Laboratory Health Physics Measurements Group (RP-2) Radiation Instrumentation and Calibration Team Thermo RadEye GX, SX, and PX with Various Detectors LA-UR

2 The following detectors have been set up on the appropriate model of RadEye. The RadEye GX (GM-eXternal detector), SX (Scintillator- eXternal detector), and PX (Proportional-eXternal detector). RadEye GX with HP-260/-360/-210T, Ludlum 44-9 GM Pancakes and HP-270/-290/-310/-300 Energy Compensated Gamma Detectors RadEye SX with HP-380AB, L43-93 Alpha/Beta surface contamination, L beta scintillator, and NaI detectors. RadEye PX with Ludlum Air Proportional Alpha detector and Neutron Rem Ball.

3 The RadEyes with the various detectors perform much better than the E-600. In the case of the RadEye with the newer Ludlum air proportional alpha detector, the RadEye is remarkably better than any other electronics with an air proportional alpha detector. RadEyes could replace Ludlum Model 2s, 3s, and 139s, Eberline ESP-1s and 2s, E-600s when they are no longer repairable.

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5 RadEyes – the Good, the Bad, and the Opportunities for Improvement Good 1. Almost indestructible, I keep on doing my toss in the air and let fall on concrete and haven’t broken a RadEye yet 2. Versatile – the 3 different versions of the RadEye will work well with all of our detectors 3. Easily repaired – we wouldn’t; if its broken then its trash 4. Calibration is much like the E-600/detector calibration 5. Audible indication of count rate and audible indication of alarm

6 6. Scaler mode in either time to count or accumulated counts 7. Background subtraction 8. Data-logging capable 9. Some detectors show a great improvement in efficiency when used with the RadEye 10. Lower crosstalk for alpha/beta detectors with the two windows separated for threshold 11. The HV plateau shows the slopes for up to 3 threshold settings and shows the count rate for each of the threshold settings at each step on the HV plateau 12. Only 5 buttons to control all of the available RadEye functions 13. Cost is lower than other comparable instruments

7 Bad 1. Long turn around time on questions for the RadEye (LANL to Mark Deacon, Mark Deacon to Germany, Germany back to Mark Deacon, Mark Deacon back to LANL) 2. The HV plateau printout is the only calibration record and it says “Erlangen – Germany plus the date” right above the signature line for the calibrator (tester) 3. The calibration technician has to calculate the detector efficiency and enter that value into the Nuclide menu in the setup software 4. We need all 3 RadEye models (GX, PX, and SX) to do what we are currently doing with the E-600

8 Opportunities for Improvement 1. We need better communications with the right RadEye experts 2. The HV plateau printout could be improved for our records 3. We need to figure out our work arounds for the things the RadEye will not do

9 Radionuclides used in the setup of the RadEyes Alpha Pu MeV Th MeV Beta Sr/Y /2,284 KeV Cl KeV Tc KeV

10 RadEye GX/HP260/HP cm 2 GM Pancake detector (Display is in Cl-36 DPM) Sr/Y % Eff. Cl % Eff. Tc % Eff. Alpha detection Pu % Eff. Th % Eff. Alarm level 1 is 100 DPM Alarm level 2 is 500 DPM Sigma alarm 3

11 RadEye GX/HP270 Energy compensated GM detector Alarm level 1 is 50 uR/hr Alarm level 2 is 5 mR/hr Sigma alarm 3 RadEye GX/HP300 Energy compensated GM detector for near Background Level measurements Alarm level 1 is 50 uR/hr Alarm level 2 is 5 mR/hr Sigma alarm 3

12 RadEye SX/L cm 2 Dual Scintillator alpha beta detector (Display is for Pu-239 DPM) Pu % Eff. Th % Eff. Alpha Alarm level 1 is 100 DPM Alarm level 2 is 500 DPM Sigma alarm 3

13 RadEye SX/L cm 2 Dual Scintillator alpha beta detector (Display is for Cl-36 DPM) Sr/Y % Eff. Cl % Eff. Tc % Eff. Beta Alarm level 1 is 1000 DPM Alarm level 2 is 5000 DPM Sigma alarm 3 Alpha to Beta Crosstalk 2.4 to 5.1% for Pu-239, 8.1 to 22.3% for Th-230 Beta to Alpha Crosstalk 0 to 0.36% for Sr/Y-90, 0% for lower energy betas

14 RadEye PX/L cm 2 air proportional alpha detector (Display is in Pu-239 DPM) Pu % Eff. Th % Eff. Alarm level 1 is 100 DPM Alarm level 2 is 500 DPM Sigma alarm 3

15 RadEye PX/L cm 2 air proportional alpha detector (Display is in Pu-239 DPM) Pu % Eff. Th % Eff. Alarm level 1 is 100 DPM Alarm level 2 is 500 DPM Sigma alarm 3

16 RadEye PX/NRD He-3 neutron detector (160 cpm per mRem/hr) Alarm level 1 is 0.1 mRem/hr Alarm level 2 is 5 mRem/hr Sigma alarm 3

17 Questions ? ? Tom Voss


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