RTI Scatter Probe User manual

RTI Scatter Probe User's Manual - English - Version 2021.5B
RTI document number: 4731.002128
RTI Scatter Probe
Scatter & Leakage in X-ray Environment

2021.5BRTI Scatter Probe User's Manual

RTI Scatter Probe

2021.5B
Notice
RTI Group AB reserves all rights to make changes in the RTI Scatter Probe and the information in this
document without notice.
RTI Group AB assumes no responsibility for any errors or consequential damages that may result
from the use or misinterpretation of any information contained in this document.
Copyright © 2021 by RTI Group AB. All rights reserved.
Content of this document may not be reproduced for any other purpose than supporting the use of
the product without prior permission from RTI Group AB.
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Service: [e-mail]
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Contact Information - United States
RTI Group AB
Flöjelbergsgatan 8 C
SE-431 37 MÖLNDAL
Sweden
Phone: Int. [phone]
E-mail
Sales: [e-mail]
Support: [e-mail]
Service: [e-mail]
Web site: https://www.rtigroup.com
Contact Information - World-Wide
RTI Scatter Probe User's Manual

2021.5B
Safety Precautions and Intended Use
The RTI Scatter Probe is intended to be used for independent service and quality control, including
measurements of air kerma, air kerma rate, ambient dose equivalent, mean energy, half value layer,
and time, within limitations stated below.
When installed according to accompanying documents, the product is intended to be used in the
area surrounding medical X-ray equipment except for:
- X-ray equipment with tube potential below 18 kV or above 160 kV.
- specific types of X-ray equipment listed in the instructions for use or in additional information from
the manufacturer.
With the X-ray installation without patient present, the product is intended to be used:
- for assessing the performance of the X-ray equipment.
- for evaluation of examination techniques and procedures.
- for service and maintenance of the X-ray equipment.
- for quality control of the X-ray equipment.
- for educational purposes, authority supervision etc.
The product is intended to be used by hospital physicists, X-ray engineers, manufacturer's service
teams, and other professionals with similar tasks and competencies. The operator needs training to
be able to use the product as intended. This training can be achieved either by study of the manual
or, on request, by a course ordered from the manufacturer.
The product is intended to be used in the area in and arround X-ray rooms ready for clinical use and
can safely be left switched on and in any measuring mode in the vicinity of patients.
The product is NOT intended to be used:
- for direct control of diagnostic X-ray equipment performance during irradiation of a patient.
- so that patients or other unqualified persons can change settings of operating parameters
during, immediately before, or after measurements.
- for any guidance to diagnosis of patients.
RTI Scatter Probe User's Manual

2021.5BRTI Scatter Probe User's Manual

Contents
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7
RTI Scatter Probe User's Manual
Table of Contents
.............................................................................................................. 9Introduction
1
.............................................................................................................. 11Product Overview
2
.............................................................................................................. 15Measure
3
.............................................................................................................................. 16
Measuring using Ocean3.1
.............................................................................................................................. 21
Measurement Settings3.2
.............................................................................................................. 23Measurement Principles & Theory
4
.............................................................................................................................. 24
Waveforms and Triggers4.1
.............................................................................................................................. 26
Mean Energy and Ambient Dose Equivalent4.2
.............................................................................................................. 27Hardware and Specifications
5
.............................................................................................................................. 28
Specifications5.1
.............................................................................................................................. 30
Standards and Compliances5.2
...................................................................................................................... 30
Manufacturer's Declaration of Conformity5.2.1
...................................................................................................................... 30
FCC Certification5.2.2
...................................................................................................................... 30
Waste Electrical and Electronic Equipment (WEEE)5.2.3
.............................................................................................................. 33Maintenance
6
.............................................................................................................................. 34
Scheduled Calibration6.1
.............................................................................................................................. 34
Updating the System6.2
................................................................................................................. 35Index

2021.5BRTI Scatter Probe User's Manual

Chapter 1
Introduction

Introduction
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10
Introduction
10 and 100 cm2Leakage and Scatter detector in one
The RTI Scatter Probe is a rugged, flat solid-state detector for leakage and scatter detection in x-ray environments. The unique
design with two separate detector areas of 10 cm2and 100 cm2makes no trade-off in fulfilling current regulations and
standards for x-ray leakage and scatter measurements.
The RTI Scatter Probe connects via USB cable to the Ocean software for reading and reporting.
Reliable Dosimetry
For barrier, leakage and scatter measurements various industry standards apply. Examples of such standards are 21 CFR
1020.30 to 21 CFR 1020.39, IEC 60601-2-3, IEC 60601-2-54, and IEC 60601-1-3. There are several more standards for various
modalities. Common for all these standards is that the measurement has to be made covering an area of 10 or 100 cm2at a
certain distance. The 10 cm2or the 100 cm2detector area of the RTI Scatter Probe ensures full compliance with these
standards.
It does not matter if your scatter and leakage application requires measurements at a short distance, long distance, in a fix
position or sweeping. With a click you select to use the 10 cm2or the 100 cm2area for your measurement.
Easy Positioning
Regardless if holding the probe by hand, if it stands on a table or mounting it on a tripod, the positioning is quick and simple.
The included mini-tripod makes the hand-held use simple. Just flip out the feet on the mini-tripod and you have a vertical
positioning. The design with anti-slip surface allows safe positioning facing upwards without sliding. With the standard camera
tripod thread, the RTI Scatter Probe can be mounted to any tripod or jig.
Measurement Parameters
The RTI Scatter Probe measures following parameters.
Air Kerma
Air Kerma Rate
Peak Air Kerma Rate
H*(10)
H*(10) Rate
Peak H*(10) Rate
Mean Energy
Half Value Layer
Time
Notice: Some parameters may not be measured depending on signal level and/or radiation energy.

Chapter 2
Product Overview

Product Overview
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Product Overview
Indicators and parts
The images and tables below describe the indicators, connectors, and parts of the RTI Scatter Probe
Front view (left)
#
Name
Description
1
10 cm2 detector surface
The Scatter Probe has two integrated detector areas.
The center marks show the 10 cm2area (33.3 x 33.3 mm).
2
100 cm2detector surface
The outer marks show the 100 cm2area (100 x 100 mm).
3
Mini-tripod/handle
The Scatter Probe comes with a mini-tripod.
4
USB cable
USB A to USB C, 5 m cable (re-scaled in image).
5
Product marking
Displays detailed information about the product and model
6
Camera thread
Camera thread for mounting the Scatter Probe to the complementary mini-tripod, or
any standard camera tripod.
7
USB port
USB C port for connection to display unit.

Product Overview
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Rear view (right)
#
Name
Description
8
LED bar
A nine multi-color LED bar, serves as radiation level indicator.
9
Trig button
Button for triggering.
The function of the trig button is controlled from the display device.
10
Status LED indicator
The LED (green/red) indicates the status of the Scatter Probe.
11
Rubber feet
The rubber cross on the rear of the Scatter Probe makes it safe to place the Scatter
Probe on a flat surface with the detector surface facing upwards, without slipping.
The Detector surfaces (1 and 2)
The Scatter Probe has two detector areas of 10 and 100 cm2respectively. The area to use for a measurement is user-selectable
from Ocean. The area to use depend on the application and what standard or regulation to follow.
Status indicator (10)
The Scatter Probe power on when it is connected via USB to a display unit. The status indicator turns RED when the Scatter
Probe has power. During measurement with Ocean, the status indicator has various functions, see below.
GREEN
READY for radiation (in communication with Ocean).
Flashing GREEN
MEASURE. The Scatter Probe measures, either by auto-trig or manual trig.
RED
NOT ready for radiation.
Flashing RED
Pause
The LED bar (8)
The LED bar serves as radiation level indicator. The number of lit LEDs is proportional to the irradiation rate.
The sensitivity of the LED bar is user-selectable by setting the Alarm Level for air kerma rate, or for ambient dose equivalent rate.
The settings are made from Ocean, see Measurement settings.
The table below describes the function of the LED indicators from left to right.
1st to 7th TURQUOISE
Irradiation rate lower than Alarm Level. Each LED corresponds to 15% of the Alarm Level. The 1st
LED will light up as soon as radiation is detected.
8th Flashing ORANGE
Irradiation rate higher than Alarm Level. Range from Alarm Level to 25 mGy/h (50 mSv/h).
8th ORANGE
Irradiation rate higher than Alarm Level. Range from 25 to 50 mGy/h (50 to 100 mSv/h).
9th Flashing ORANGE
Irradiation rate higher than Alarm Level. Range from 50 to 75 mGy/h (100 mSv/h to 150 mSv/h).
9th ORANGE
Irradiation rate higher than Alarm Level. Range from 75 to 100 mGy/h (150 to 200 mSv/h).
8th and 9th Flashing RED
Detector saturation. Irradiation rate too high.
Peak Rate indication
The highest rate during the measurement is indicated on the LED bar. When highest rate during a measurement is indicated by
a blue LED. The indication of the highest rate will stay lit until measurement is finished.
The trig button (9)
The trig button is controlled by Ocean. The function of the button depends on measuring mode and measuring status. The
button is a pressure sensitive surface. The response of the button is indicated by the status LED (10) and a vibration.
The various functions for the trig button is described below.

Product Overview
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Manual Mode (Free-run)
When the status LED shows constant green (ready for radiation) - Start
Measure
When the status LED shows flashing green (measure) - Stop Measure
Timed Mode
When the status LED shows constant green (ready for radiation) - Start
Measure
Normal Mode (Auto-trig)
The trig button is not active
Other functions
Sound
The radiation level is indicated with a crackling sound (GM-counter like sound), which is proportional to the irradiation rate. The
sensitivity (changing frequency of the sound) is changed when the Alarm Level is changed, as described above. The sound can
be enabled/disabled from Ocean, see Measurement settings.
Trig Mode - Post Delay
When Normal measuring mode (auto-trig) is used the radiation has to be off for 3 seconds after trig off before the Scatter Probe
is ready for a new measurement. This time is called Post Delay. If radiation is detected before the Post Delay has passed, the
Scatter Probe will consider the measurement not finished, and will continue to measure.
E.g:
If an interrupt between two irradiation events is < 3 s, the Scatter Probe will consider them as one event.
If an interrupt between two irradiation events is > 3 s, the Scatter Probe will consider them as separate events.
Notice:
When the irradiation rate is low and varies, and temporarily goes below the trig level for a longer period of time than the
Post Delay, the Scatter Probe will trig off, and a new measurement may start. In such case it is advised to use Manual
Mode (Free-run) or Timed Mode to avoid "false" trig off.

Chapter 3
Measure

Measure
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Measure
3.1 Measuring using Ocean
The following description assumes that Ocean is installed on a computer and started. For more information about Ocean, see
separate documentation.
Furthermore it assumes that measurement is performed in an X-ray environment using a diagnostic x-ray unit with open
collimation.
The first measurement
Normal Mode (Auto trig)
When the irradiation rate is expected to be higher than 5 µGy/h (or 10 µSv/h) during the entire measurement, Normal Mode can
be used. The Scatter Probe will then auto-trig when irradiation rate is above trig level.
1. Connect the RTI Scatter Probe to the computer with an USB cable to the USB port, see Product overview.
2. Start Ocean and wait for the Scatter Probe to connect.
3. Place the RTI Scatter Probe in a position about 1 m from the x-ray source with the detector surface facing the x-ray unit.
4. From the Backstage in Ocean, select Quick Check.
5. Select the Scatter Probe if the Find/select meter window appears.
6. Select type of measurement - In this example select Air kerma rate

Measure
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7. Select which detector area you want to use - In this example select Large (100 cm2)
8. The measurement screen will open.
9. The Scatter Probe is ready to measure when the the Ready sign in the upper left part of the measurement screen turns
green and shows Ready. The status indicator LED on the Scatter Probe will also turn green.
10. Make an exposure at an high kV, mA and time setting. E.g. on R/F system select 100 kV, 500 ms, 100 mA.
11. The display will update.

Measure
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Notice:
The displayed values after end of measurement for Air Kerma (Gy) and Ambient Dose Equivalent H*(10) (Sv) represent the
integrated radiation from start to stop of measurement.
The peak rate (Air Kerma rate and H*(10) rate) parameters show the highest identified value between start and stop of
measurement.
The rest of the parameters (rate, mean energy, HVL) show the values from the last complete two-second period. I.e. a time
frame slightly before end of measure.
If the measuring time is shorter than two seconds, all displayed values will represent the entire measurement.
Free-run (Manual trig on and off)
When the irradiation rate is expected to be below 5 µGy/h (or 10 µSv/h), Free-run or Timed Mode i recommended. The Scatter
Probe will then be manually trigged by the user.
Assuming that the instruction for The first measurement above is followed until the measurement screen is open (point #8).
1. Go to Meter Settings.
2. Select measuring mode - Free-run.
3. Press the Meter settings icon to get back to the measurement screen.

Measure
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4. The Scatter Probe is ready to measure when the the Ready sign in the upper left part of the measurement screen turns
green and shows Ready. The status indicator LED on the Scatter Probe will also turn green.
5. Start the measurement (trig on) by pressing the Start button in Ocean, or the Trig button on the Scatter Probe.
6. Measured values will update in the displays every two seconds until the measurement is stopped.
7. End measurement by pressing the Stop button in Ocean, or the Trig button on the Scatter Probe.

Measure
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8. The Scatter Probe is ready for a new measurement when the Ready sign in the upper left part of the measurement screen
turns green and shows Ready. The status indicator LED on the Scatter Probe will also turn green.
Notice:
The displayed values after end of measurement for Air Kerma (Gy) and Ambient Dose Equivalent H*(10) (Sv) represent the
integrated radiation from start to stop of measurement.
The peak rate (Air Kerma rate and H*(10) rate) parameters show the highest identified value between start and stop of
measurement.
The rest of the parameters (rate, mean energy, HVL) show the values from the last complete two-second period. I.e. a time
frame slightly before end of measure.
If the measuring time is shorter than two seconds, all displayed values will represent the entire measurement.
Timed Mode (Manual trig on)
As an alternative to Free-run (see above), Timed Mode can be used. The difference is that instead of a manual stop of the
measurement, a predefined measurement time is used.
Assuming that the instruction for The first measurement above is followed until the measurement screen is open (point #8).
1. Go to Meter Settings.
2. Select Timed Measuring Mode, and a desired measuring time window.
3. Press the Meter settings icon to get back to the measurement screen.
4. The Scatter Probe is ready to measure when the the Ready sign in the upper left part of the measurement screen turns
green and shows Ready. The status indicator LED on the Scatter Probe will also turn green.
5. Start the measurement (trig on) by pressing the Start button in Ocean, or the Trig button on the Scatter Probe.
6. Measured values will update in the displays every two seconds until the measurement is finished.
7. The measurement will automatically stop after the measuring time window has elapsed.
Alternatively the measurement can be stopped manually by pressing the Stop button in Ocean, or the Trig button on the
Scatter Probe.
8. The display will update.
9. The Scatter Probe is ready for a new measurement when the Ready sign in the upper left part of the measurement screen
turns green and shows Ready. The status indicator LED on the Scatter Probe will also turn green.
Notice: