+---------------------------------------------------------+------------+
| **GODDARD SPACE FLIGHT CENTER**                         |            |
|                                                         |            |
| **REQUEST FOR RADIATION SAFETY COMMITTEE ACTION**       |            |
|                                                         |            |
| **IONIZING RADIATION PRODUCING DEVICE QUESTIONNAIRE**   |            |
+---------------------------------------------------------+------------+
| 1\. \_\_\_\_Gendreau, Keith, C \_\_\_\_\_\_\_           | Docket \#  |
| \_\_\_\_662 \_ \_\_\_6-6188 \_\_\_ 28 March 2005\_      |            |
|                                                         |            |
| #                                                       |            |
|   Originator\'s Name: (Last, First, MI) Code Phone Date |            |
+---------------------------------------------------------+------------+
| 2\. Device Data and Description:                        |            |
|                                                         |            |
| a\. Device type: \_\_\_Electron Impact X-ray            |            |
| Source\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_                    |            |
|                                                         |            |
| b\. Manufacturer and Address:                           |            |
|                                                         |            |
| Austin Instruments, Inc.                                |            |
|                                                         |            |
| 10 Temple Street Reading MA 01867-2830                  |            |
|                                                         |            |
| Tel: (800) 818-7403 Fax: (800) 818-7403                 |            |
|                                                         |            |
| e-mail: austinst@tiac.net                               |            |
|                                                         |            |
| c\. Model Number: \_\_Manson Model 2\_\_                |            |
|                                                         |            |
| d\. Operating Parameters                                |            |
|                                                         |            |
| Maximum- \_\_\_\_\_10\_\_\_\_kVp; \_\_\_\_\_\_0.5 \_mA  |            |
|                                                         |            |
| Normal- \_\_\_\_\_\_10_kVp; \_\_\_\_\_\_\_0.2\_\_mA     |            |
|                                                         |            |
| Average Weekly "on" time- \_\_\_7200 minutes (when in   |            |
| use Annual average \< 1000 minutes per week)            |            |
|                                                         |            |
| e\. Target Materials: \_Aluminum, Copper, Tungsten,     |            |
| Titanium, Carbon\_\_\_                                  |            |
|                                                         |            |
| f\. Description of Use: \_\_\_Calibration of and        |            |
| testing of X-ray Optics                                 |            |
+---------------------------------------------------------+------------+
| 3\. Detailed Description: (attach installation plans,   |            |
| diagrams, applicable manufacturer info, etc)            |            |
|                                                         |            |
| Number of pages attached: \_\_\_1\_ (Include State      |            |
| Certifications if applicable)                           |            |
+---------------------------------------------------------+------------+
| ##  HEALTH PHYSICS USE ONLY                             |            |
+---------------------------------------------------------+------------+
| 4\. Date Received: \_\_\_\_\_\_\_\_\_\_\_\_\_ 5. GSFC   |            |
| #\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ 6. Source Type:   |            |
| \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_                          |            |
|                                                         |            |
| 7\. Serial Number: \_\_\_\_\_\_\_\_\_\_\_\_\_           |            |
|                                                         |            |
| 8\. Survey Frequency: \_\_\_\_\_Annual                  |            |
| \_\_\_\_\_\_Biennial \_\_\_\_\_\_Triennial              |            |
|                                                         |            |
| 9\. Notes:                                              |            |
|                                                         |            |
| 10\. Health Physics Certification:                      |            |
| \_\_\_\_\_\_\_\_\_\_\_\_\                               |            |
| _\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ |            |
| \_\_\_\_\_\_\_                                          |            |
|                                                         |            |
| Printed Name Date                                       |            |
|                                                         |            |
| \_\_\_\_\_\_\_\_\_\_\_\_\                               |            |
| _\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ |            |
|                                                         |            |
| Signature                                               |            |
|                                                         |            |
| FINAL DISPOSITION:                                      |            |
| \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_                |            |
| \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\ |            |
| _\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ |            |
|                                                         |            |
| \_\_\_\_\_                                              |            |
| \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\ |            |
| _\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ |            |
| \_\_\_\_\                                               |            |
| _\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ |            |
|                                                         |            |
| Person Authorizing Disposition                          |            |
+---------------------------------------------------------+------------+

**GSFC Form 23-28I \[DEVICE\] (01/00) Return to Code 205.9**

Instructions for filling out GSFC Form 23-28I \[DEVICE\], Request for
Radiation Safety Committee Action - Ionizing Radiation Producing Device
Questionnaire. For additional guidance refer to GPG 1860.1 \"Ionizing
Radiation Protection,\" particularly paragraph 2.1.4.4.

### ALL ITEMS MUST BE LEGIBLE

1\. If you do not have a GSFC Code designation you must include a valid
mailing address on an attached paper.

2\. Source Data:

a\. Device type;

b\. Manufacturer and address of manufacturer (include telephone number
if known);

c\. Model number;

d\. List the operating parameters;

Maximum kVp and mA that the device is capable of

Normal kVp and mA that the device will be routinely operated

Average weekly use in minutes

e\. Types of target materials built into the system or which will be
targeted by the device.

f\. Give a brief description of the proposed use.

3\. Provide a detailed description of the installation, include a
diagram and specific dimensions. Provide any manufacturer information
that will be useful in reviewing the device and its installation.
Include a copy of State safety certifications if applicable.

**RETURN COMPLETED FORM TO CODE 205.9** (Health Physics).

If you have any questions concerning this form, please contact

the Safety and Environmental Branch, Health Physics Department at
301-286-8482.

*HEALTH PHYSICS USE ONLY*

4\. Indicates the date source was originally surveyed by Health Physics.

5\. Indicates the GSFC identification number assigned by Health Physics.

6\. Indicates the source Type classification determined by Health
Physics (GPG 1860.1, paragraph 2.1.4.3.a).

7\. Indicates the manufacturers serial number (if any).

8\. Survey requirements determined by Health Physics.

9\. Special Health Physics notes.

10\. Certifying Health Physics personnel.

Final disposition will be certified by persons authorized by the
Radiation Safety Committee only.

**Detailed Usage of Manson Source at Area 200 X-ray Interferometry
Testbed.**

**The MANSON MODEL 2 MINI FOCUS X-RAY SOURCE:**

![](media/image1.pct){width="6.902777777777778in"
height="3.9444444444444446in"}

Figure 1: Manson Model 2 X-ray Source Diagram

We use the Manson model 2 X-ray source made by:

Austin Instruments, Inc.

10 Temple Street Reading MA 01867-2830

Tel: (800) 818-7403 Fax: (800) 818-7403 e-mail: austinst@tiac.net

The Model 2 Ultrasoft X-ray Source illustrated above was developed for
use in the radiometric calibration of grazing incidence spectrometers,
and its design features have made it useful in other applications as
well. A special feature is that two equivalent output beams are
provided, from two views of the single emitting spot where the electron
beam from the hairpin filament collides with the replaceable anode cap.
This spot is between 0.2 and 2 mm in diameter, depending on the voltage
and current. The centerlines of the two output beams lie in a plane
containing the e- beam, which is along the axis of the source, and they
are at equal angles of 45° to the beam (or 60° as a special). Since the
e beam is along a normal to the anode surface symmetry requires that the
two output beams be of equal radiant intensity, and indeed this has
proven to be the case within about 2% at Mg-K, O-K, C-K, B-K, and Be- K.
This accuracy in beam ratio measurement was achieved by repeated
measurements in which the apertures and detectors were interchanged to
reduce systematic errors. The source output within each of these five
bands reached more than 1011 photons s-1 sr-1 at the maximum anode
loading of 5 watts, and was 1012 photons s-1 sr-1 for the C-K band at
4.2 watts. This geometry is intended to allow monitoring of one beam by
our absolute photon counter while the other beam is used to calibrate
the instrument or provide a known flux for some other purpose.

The source mounts on a tapped rotatable 2-3/4\" UHV flange on the
customer\'s vacuum system, and is bakeable to 350°C. We use the Manson
Model 3B X-ray source controller made by the same manufacturer and a
Bertan 10 keV high voltage source to run the source.

**Location of this Manson Model 2 X-ray Source:**

The source is located in a locked shed at the end of a 600 meter long
vacuum pipe- part of the GSFC X-ray Interferometry Testbed located at
Area 200. The beamline location is indicated in figure 2. The shed that
maintains the source is shown in figure 3. Area 200 is a controlled
access location that has very few visitors. A properly coded keycard is
required for access to the location.

The source is pumped by a 50 l/s turbo pump and is normally separated
from the rest of the vacuum system by a gate valve- unless when in use.

The source is put on manually once the vacuum chamber around the source
is at a pressure of less than \~10\^-5 Torr:

1)  over a \~ 5minute period the filament current is energized to 6
    amps.

2)  At this point the accelerating high voltage is slowly (over 1
    minute) raised to 10 keV.

3)  The Electron emission current is adjusted until the beam current is
    typically 100-200 microamps.

Once the source is energized, we check that the vacuum level in the
beamline is better than 50 mTorr. If it is, a thin aluminized polimide
film is lowered into place in the beamline via a special designed gate
valve and then the standard gate valve is lifted. This is done since the
X-ray source requires a pressure of better than 10\^-5 Torr to operate.
The thin filter allows a differential in the pressure between the source
chamber and the beamline while allowing x-rays with an energy \>\~200 eV
to pass through. If this filter were to break due to high beamline
pressure, the Manson source would stop functioning as the electron beam
would be disturbed.

The chamber and the beamline is made of stainless steel and there are no
ports where x-rays \<10 keV could exit the vacuum system. If the X-rays
were somehow to escape, the typical emission energy we work with (1.5
keV) would travel less than 1 cm in air.

The X-rays will travel 147 meters in the vacuum system to an optics
chamber where we place test optics. The typical x-ray flux at this point
is expected to be less than 1000 photons/s/cm\^2 with a typical energy
of 1.5 keV.

X-rays that pass through the optics will travel another 450 meters to an
x-ray CCD detector. At this position we expect a typical X-ray flux of
\< 100 photons/sec striking the CCD.

Operations will run for typically 1 week at a time with nearly
continuous x-ray usage. We expect to have \~1 week "runs" about once a
month or so.

![](media/image2.pct){width="7.810416666666667in" height="4.175in"}

![](media/image3.pct){width="6.861111111111111in"
height="4.986111111111111in"}