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Hi All, Someone posted these a while ago on this mailing list. I have printed one of these out (I forget which one now!) using a laser printer on the film and it came out as an accurate ruler! And then ya, I cut off strips as I need them. I</div>
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<p class="MsoNormal"><span lang="EN-CA" style="font-size:11.0pt;font-family:"Times New Roman",serif;mso-fareast-language:EN-US">Hi All,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-size:11.0pt;font-family:"Times New Roman",serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-size:11.0pt;font-family:"Times New Roman",serif;mso-fareast-language:EN-US">Someone posted these a while ago on this mailing list. I have printed one of these out (I forget which one now!) using a laser printer
on the film and it came out as an accurate ruler! And then ya, I cut off strips as I need them.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-size:11.0pt;font-family:"Times New Roman",serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-size:11.0pt;font-family:"Times New Roman",serif;mso-fareast-language:EN-US">I have about 10 sheets and I think I should be good for the rest of my career … So my caution would only be to not order too big
of a box…<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-size:11.0pt;font-family:"Times New Roman",serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Times New Roman",serif">Kind regards,</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Times New Roman",serif"> </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Times New Roman",serif">Thor Bjarnason, PhD, PEng, FCCPM</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Times New Roman",serif">Medical Physicist</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Times New Roman",serif">Interior Health, Kelowna, BC
</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-size:11.0pt;font-family:"Times New Roman",serif">Office: (250) 980-6157 | Mobile: (250) 826-0722
</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Times New Roman",serif">Thor.Bjarnason@interiorhealth.ca</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Times New Roman",serif"> </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span><span lang="EN-CA" style="font-size:11.0pt;font-family:"Times New Roman",serif;mso-fareast-language:EN-US"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Intl_dxmedphys_wd_osu_list <intl_dxmedphys_wd_osu_list-bounces@lists.osu.edu>
<b>On Behalf Of </b>Peter Watson, Mr via Intl_dxmedphys_wd_osu_list<br>
<b>Sent:</b> 03 June 2026 9:10 AM<br>
<b>To:</b> Bob Kobistek <bob@rjkmedphys.com>; Douglas Pfeiffer <xraydoug@me.com><br>
<b>Cc:</b> DxMedPhys List <intl_dxmedphys_wd_osu_list@lists.osu.edu><br>
<b>Subject:</b> Re: [Intl_DxMedPhys] Gafchromic film<o:p></o:p></span></p>
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<b><span style="color:#222222">Caution:</span></b><span style="color:#222222"> This email originated from outside of Interior Health. Do not click links or open attachments unless you recognize the sender, their email address, and know the content is safe.
If you suspect this is a phishing or fraudulent email please forward it to <a href="mailto:spam@interiorhealth.ca">
spam@interiorhealth.ca</a>. <o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-line-height-alt:.75pt"><span style="font-size:1.0pt;color:white">I've got some old XR-QA2 films that I've been parsimonious with, they are still quite dose sensitive after nearly a decade! I wish they still made this model (good
contrast at ~1 mGy, vs the nearly 20 mGy needed for LD-V1). Peter Watson, PhD,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">I've got some old XR-QA2 films that I've been parsimonious with, they are still quite dose sensitive after nearly a decade! I wish they still made this model (good contrast at ~1 mGy, vs the nearly 20 mGy needed
for LD-V1).<o:p></o:p></span></p>
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<p class="elementtoproof"><span style="font-family:"Calibri",sans-serif;color:black">Peter Watson, PhD, MCCPM</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black">(masculine pronouns)<o:p></o:p></span></p>
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<p class="elementtoproof"><span style="font-family:"Calibri",sans-serif;color:black">Medical Physicist, McGill University Health Centre</span><o:p></o:p></p>
<p class="elementtoproof"><span style="font-family:"Calibri",sans-serif;color:black">Assistant Professor, Medical Physics Unit and Department of Oncology, McGill University</span><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> Intl_dxmedphys_wd_osu_list <<a href="mailto:intl_dxmedphys_wd_osu_list-bounces+peter.watson=mcgill.ca@lists.osu.edu">intl_dxmedphys_wd_osu_list-bounces+peter.watson=mcgill.ca@lists.osu.edu</a>>
on behalf of Douglas Pfeiffer via Intl_dxmedphys_wd_osu_list <<a href="mailto:intl_dxmedphys_wd_osu_list@lists.osu.edu">intl_dxmedphys_wd_osu_list@lists.osu.edu</a>><br>
<b>Sent:</b> June 3, 2026 11:32 AM<br>
<b>To:</b> Bob Kobistek <<a href="mailto:bob@rjkmedphys.com">bob@rjkmedphys.com</a>><br>
<b>Cc:</b> DxMedPhys List <<a href="mailto:intl_dxmedphys_wd_osu_list@lists.osu.edu">intl_dxmedphys_wd_osu_list@lists.osu.edu</a>><br>
<b>Subject:</b> Re: [Intl_DxMedPhys] Gafchromic film</span> <o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-line-height-alt:.75pt"><span style="font-size:1.0pt;color:white">Precisely. In mammography, just need to remember to protect the detector. Best regards, Doug Douglas Pfeiffer, MS, DABR FACR, FAAPM (he/him) Medical Physicist,
Radiation Safety Officer Boulder Community Health xraydoug@</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">me.</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">com
303.</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">415.</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">7515
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-<o:p></o:p></span></p>
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<p class="MsoNormal">Precisely. In mammography, just need to remember to protect the detector.
<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="color:black">Best regards,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Doug<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Douglas Pfeiffer, MS, DABR FACR, FAAPM (he/him)<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Medical Physicist, Radiation Safety Officer<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Boulder Community Health<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><a href="mailto:xraydoug@me.com">xraydoug@me.com</a><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">303.415.7515<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black">The opinions expressed in this message are the product of the gray and white matter loitering in my cranium. I speak for myself and no one else, unless I say otherwise.<o:p></o:p></span></p>
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<o:p></o:p></p>
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<p class="MsoNormal">On Jun 3, 2026, at 9:31<span style="font-family:"Arial",sans-serif"> </span>AM, Bob Kobistek <<a href="mailto:bob@rjkmedphys.com">bob@rjkmedphys.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">Yep, but for stuff like measuring CT beam collimation it doesn't matter. Crank up the mAs to get a good image, then take an image at half the mAs to use as a reference for FWHM. Sensitivity and fog level shouldn't matter<br>
<br>
<br>
Robert J. Kobistek, MS, FACR, DABR, MRSE(MRSC™)<br>
Medical Physicist<br>
RJK Medical Physics, Inc.<br>
440-463-7879<br>
<br>
-----Original Message-----<br>
From: Douglas Pfeiffer <<a href="mailto:xraydoug@me.com">xraydoug@me.com</a>> <br>
Sent: Wednesday, June 3, 2026 11:06 AM<br>
To: Nicole Ranger <<a href="mailto:nicoletranger@yahoo.com">nicoletranger@yahoo.com</a>><br>
Cc: Bob Kobistek <<a href="mailto:bob@rjkmedphys.com">bob@rjkmedphys.com</a>>; DxMedPhys List <<a href="mailto:intl_dxmedphys_wd_osu_list@lists.osu.edu">intl_dxmedphys_wd_osu_list@lists.osu.edu</a>><br>
Subject: Re: [Intl_DxMedPhys] Gafchromic film<br>
<br>
Yup. It just loses sensitivity, in my experience.<br>
<br>
<br>
Doug<br>
-------------<br>
Sent from my iPhone - please excuse any typos that slip through!<br>
<br>
<br>
<o:p></o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal">On Jun 3, 2026, at 9:01<span style="font-family:"Arial",sans-serif"> </span>AM, Nicole Ranger via Intl_dxmedphys_wd_osu_list <<a href="mailto:intl_dxmedphys_wd_osu_list@lists.osu.edu">intl_dxmedphys_wd_osu_list@lists.osu.edu</a>> wrote:<br>
<br>
<span style="font-family:"Tahoma",sans-serif"></span>Thanks Bob. I used large sheets in the past to assess skin dose distributions in fluoro procedures and the results were informative but baselines mattered there. Glad to know the consensus is that they
can be used almost indefinitely for QC.<br>
<br>
Nicole<br>
<br>
<br>
Sent from my iPhone<br>
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<p class="MsoNormal">On Jun 3, 2026, at 11:55<span style="font-family:"Arial",sans-serif"> </span>AM, Bob Kobistek <<a href="mailto:bob@rjkmedphys.com">bob@rjkmedphys.com</a>> wrote:<br>
<br>
<span style="font-family:"Tahoma",sans-serif"></span>I'd say as long as you can see a useable image, keep using the film. I left some sheets in my hot car over last summer. The sheets are much darker than new sheets, but I'm still using them for CT collimation
testing. I can even scan and locate the FWHM with no problems.<br>
<br>
<br>
Robert J. Kobistek, MS, FACR, DABR, MRSE(MRSC™) Medical Physicist RJK <br>
Medical Physics, Inc.<br>
440-463-7879<br>
<br>
-----Original Message-----<br>
From: Intl_dxmedphys_wd_osu_list <br>
<<a href="mailto:intl_dxmedphys_wd_osu_list-bounces+bob=rjkmedphys.com@lists.osu.edu">intl_dxmedphys_wd_osu_list-bounces+bob=rjkmedphys.com@lists.osu.edu</a>>
<br>
On Behalf Of Nicole Ranger via Intl_dxmedphys_wd_osu_list<br>
Sent: Wednesday, June 3, 2026 9:33 AM<br>
To: DxMedPhys List <<a href="mailto:intl_dxmedphys_wd_osu_list@lists.osu.edu">intl_dxmedphys_wd_osu_list@lists.osu.edu</a>><br>
Subject: [Intl_DxMedPhys] Gafchromic film<br>
<br>
Good morning list,<br>
<br>
I’ve used Gafchromic film extensively in the past in a dosimetry context where cumulative exposure during storage was important but for the Gafchromic that you use for imaging QC purposes (CT, Mammo, etc…) where the baseline exposure is less important so long
as there is adequate contrast, what would you consider to be a useful timeframe before the film is less useful? Just wondering if there is any downside when buying a box. We have relatively fewer devices here than I have had to support in the past so I’m
not sure how quickly I will go through this stuff.<br>
<br>
TIA<br>
Nicole<br>
<br>
<br>
Sent from my iPhone<o:p></o:p></p>
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