X-Ray setup calibration (170131) - Revision history

Greg at 02:11, 9 February 2017

2017-02-09T02:11:42Z

Greg at 02:11, 9 February 2017

2017-02-09T02:11:29Z

Greg at 02:11, 9 February 2017

2017-02-09T02:11:04Z

Greg at 01:22, 9 February 2017

2017-02-09T01:22:49Z

Greg: Created page with "Calibration of X-Ray setup was performed using [http://www.raysafe.com/en/Products/Equipment/RaySafe%20ThinX#Downloads link RaySafe ThinX Rad] dosimeter (data sheet in link)..."

2017-02-09T01:21:22Z

Created page with "Calibration of X-Ray setup was performed using [http://www.raysafe.com/en/Products/Equipment/RaySafe%20ThinX#Downloads link RaySafe ThinX Rad] dosimeter (data sheet in link)..."

New page

Calibration of X-Ray setup was performed using [http://www.raysafe.com/en/Products/Equipment/RaySafe%20ThinX#Downloads link RaySafe ThinX Rad] dosimeter (data sheet in link)

[[File:dosim.png]]

Unfortunately, we discovered that dose of irradiation is not uniform in horizontal plane and some area were over the dosimeter limit. We were able to measure dose placing directly under the source of x-rays so we decided to calibrate setup only in center of each shelf (there are 9 shelves).

Dosimeter has a limit of exposure time so we set the X-Ray setup to 6s. We notice dosimeter shows irradiation time to be ~7.5s (additional raise/dead time). Dosimeter shows estimation for a minute and those values are in the plots. Below there is a table with all results. Measuring area of dosimeter is circle with 15mm radius.

[[File:XRay_dose.png]]
''Distance (shelf) dependence of the dose rate in the x-ray machine. The dosimeter was always placed at the center of the shelf, and measured the doses at 3 different currents (1.0, 4.0, and 6.2mA)''
[[File:coeffs_mA.png]]
''Linearity of dose rate as a function of current in X-Ray''

The dose rate follows very nicely the 1/d^2 rule (for distances greater than 20cm, i.e., shelves position from 1 to 8). Also, the dose rate is very linear with current set in the instrument.

Raw data:

[[File:calData.png]]

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 Calibration of X-Ray setup was performed using [http://www.raysafe.com/en/Products/Equipment/RaySafe%20ThinX#Downloads link RaySafe ThinX Rad] dosimeter (data sheet in link)
-[[File:dosim.jpg]]
+[[File:dosim.jpg|frameless|center|upright=0.85]]
 Unfortunately, we discovered that dose of irradiation is not uniform in horizontal plane and some area were over the dosimeter limit. We were able to measure dose placing directly under the source of x-rays so we decided to calibrate setup only in center of each shelf (there are 9 shelves).
@@ Line 7: / Line 7: @@
 Dosimeter has a limit of exposure time so we set the X-Ray setup to 6s. We notice dosimeter shows irradiation time to be ~7.5s (additional raise/dead time). Dosimeter shows estimation for a minute and those values are in the plots. Below there is a table with all results. Measuring area of dosimeter is circle with 15mm radius.
-[[File:XRay_dose.png]]
+[[File:XRay_dose.png|frameless|center|upright=0.85]]
 ''Distance (shelf) dependence of the dose rate in the x-ray machine. The dosimeter was always placed at the center of the shelf, and measured the doses at 3 different currents (1.0, 4.0, and 6.2mA)''
-[[File:coeffs_mA.png]]
+[[File:coeffs_mA.png|frameless|center|upright=0.85]]
 ''Linearity of dose rate as a function of current in X-Ray''