PRM-470 Gamma Alignment

Use a medium Phillips (PH2) screwdriver. Screws do not need to be completely removed.

Use provided Mini-USB [universal serial bus] to USB cable.

Connect to the SIGNAL input.

Settings should match the image below.

Center the source on the detector.

Black test lead connects to TP20. Red test lead connects to TP1.

The traffic light icon will start/stop data acquisition.

Placing the cursor at the peak location will aid in monitoring the counts in that channel.

Use the correct file naming convention.

Example: US_Richland_CG_1024_1ST_PRE

Red test lead connects to TP2.

Start data collection.

Placing the cursor at the peak location will aid in monitoring the counts in that channel.

Use the correct file naming convention.

Example: US_Richland_CG_1024_2ND_PRE

Use Fluke 80K-40 high voltage (HV) probe and Fluke 179 DMM.

The ground TP38 is located on the GHA-472 gamma board and might not be clearly labeled.

Connect black test lead of HV probe to TP38. Verify good connection.

The HV TP34 is located on the GHA-472 gamma board and might not be clearly labeled.

Contact TP34 with tip of red HV probe.

The number indicated on the DMM must be multiplied by 1000 if the 80K-40 probe is being used.

Example: 0.7453 x 1000 = 745.3 Volts DC.

Black test lead connects to TP20. Red test lead connects to TP1.

Use precision slotted (tweaker) screwdriver to adjust R10 until peak is centered on channel 115. If no peak is visible, try turning R10 several turns in both directions until the peak appears.

Place the cursor at channel 115 to monitor the counts.

Use the correct file naming convention.

Example: US_Richland_CG_1024_1ST_POST

Move red test lead to TP2.

Use Tweaker to adjust R17 (may not be labeled on board) until peak is centered on 310 Channel. If no peak is visible, try turning R17 several turns in both directions until the peak appears.

Place the cursor at channel 310 to monitor the counts.

Use the correct file naming convention.

Example: US_Richland_CG_1024_2ND_POST

Repeat high voltage measurement steps provided earlier in this procedure.

The number indicated on the DMM must be multiplied by 1000 if the 80K-40 probe is being used.

Example: 0.7453 x 1000 = 745.3 Volts DC.

Power off DMM. Carefully remove test leads.

Use a medium Phillips (PH2) screwdriver.

Record observations, times, and results for the maintenance report.

As specified by management or contractual obligations.