| Beams-doc-2834 |
|---|
| Beams-doc-2834 |
|---|
In preparation for the 2004 Facility Shutdown, a survey for high radiation areas was conducted in the Main Injector. Data from that and subsequent surveys were stored in spreadsheet files. By Fall 2005, a system for regular monitoring of radiation using a new dual-range meter with bar-code reading capability was implemented. This document will briefly describe these monitoring efforts. The spreadsheet data from these sets of monitoring efforts will be stored in Beams DocDB with this document. Information on the operational use of the meter and a list of bar coded locations will be included.
Using Log Survey Meters (LSM's) from the supply in the Main Control Room, measurements were taken to locate and monitor areas of the Main Injector which showed significant residual radioactivity. This was done with a goal of surveying the situation, thus the limits for recording information were being developed and therefor varied. Typically, any location with more than 10 to 25 milliRem/hr on contact was documented. It was not obvious what problem would create residual radiation but it is likely that the most activated items would be adjacent to the beam pipe. At most interesting locations, data was recorded for top, bottom, aisle (radially inside) and wall (radially outside) at (in contact with) or near the beam pipe. Exceptions included the regions between quadrupoles and corrector sextupoles where it was not possible to touch the beam pipe. The LSM's have a range from 2 mR/hr to 2000 mR/hr. Some readings were recorded of a bit less than 2 mR/hr by noting readings below the lowest mark. Readings of a bit above 2000 mR/hr were estimated by observation of the increase of the reading as probe approached the desired measuring location.
Data from these surveys were recorded on paper using copies of the radiation survey maps for the Main Injector. Almost all of this data was then entered into a spreadsheet for tracking and comparisons. Measurements were made on several occasions between November 2003 and June 2004 by Dave Capista and/or Alberto Marchionni. Between June 2005 and August of 2005, measurements were recorded by Bruce Brown on more than a dozen dates including many complete tours of the Main Injector tunnel. Some early conclusions were reported in Beams-doc-1382.
Based on the intensive surveys in 2004-2005, it was determined that a monitoring program of measurements at a set of locations marked by Bar-code labels would assist in further monitoring. This was in part to be sure that repeatability from survey to survey would be possible. In addition, the need to reduce personnel exposure during the survey was essential. With this in mind an extensive set of monitor locations was established, about half of which are at Lambertson Magnet locations, and bar codes were printed and installed. A radiation meter with bar-code reading capability and data storage was purchased. Since that time, almost all surveys have been done with the new meter. On one occasion, the batteries were dead so a bar-code location survey was done with an LSM.
The meter chosen is a ROTEM meter capable of storing 347 measurement records in non-volatile memory. For details on its capability, one should consult the manual. However, let us describe the use pattern developed for the Main Injector measurements.
This spreadsheet was initiated by Alberto Marchionni and was carried forward until the LSM measurements were replaced by the ROTEM meter readings at bar-coded locations. It is not organized for presentation but is being preserved to make it available for others. In contains nine worksheets and 15 charts. This includes the basic data in worksheet RadiationSummary and extracts of that data or supplements to it in Lambertsons, DQuadLoss, and FQuadLoss. Worksheet Notes contains a brief list and description of the measurements including, in some cases, the cooldown time between beam off and start of measurements. Other worksheets are a mixture of calculations and some additional measurements. The charts contain running efforts to make presentations as the measurements progressed.
This file was the source of information for printing the bar codes. It contains an ordered list (almost) of the labels for radiation monitoring bar codes as well as a description of the location to which that bar code was applied. The bar code label shows the ASCII and bar code representations for these label.
This file contains the data for measurements at the bar-coded monitor locations. Data from prior to the commissioning of the ROTEM meter as well as one tunnel tour when the batteries were dead are included as well as all data transferred from the .csv files from the ROTEM meter surveys. In addition to the data, many columns are devoted to ratios from different dates. The first column contains the label value and the last column is the description of the monitor location where that label was applied. Sheet 1 contains the data while various charts occupy the other worksheet tabs.
