[Intl_DxMedPhys] HDR source living inside imaging lab

[Bill Erwin]

If there is a well counter close by, it should be tested for excessive
background with those sources present.  (Years ago at MD Anderson, we had
an issue with unused I-131 therapy sources periodically sitting in our
decay room with 1/2" wall shielding but up to only 7', and a well counter
in the hot lab on the other side of the wall.  Our solution to the
resultant occasional high background was to add shielding around and over
the well counter.)

On Tue, Jan 28, 2025 at 5:08 PM Greg Gibbs via Intl_dxmedphys_wd_osu_list <
intl_dxmedphys_wd_osu_list at lists.osu.edu> wrote:

> The hdr source can certainly affect measurements on the dose calibrator.
> The easiest way to see the magnitude of the effect is to measure it. Set
> the dose calibrator at the energy you are most interested in, and get a
> reading with and without
> The hdr source can certainly affect measurements on the dose calibrator.
> The easiest way to see the magnitude of the effect is to measure it. Set
> the dose calibrator at the energy you are most interested in, and get a
> reading with and without the hdr bucket in place.  Of course the maximum
> effect will be with a new source before it is installed in the hdr after
> loader.
>
> On Tue, Jan 28, 2025, 1:40 PM Nima Kasraie via Intl_dxmedphys_wd_osu_list <
> intl_dxmedphys_wd_osu_list at lists.osu.edu> wrote:
>
>> Hello list, We have a site where they will be storing HDR sources like
>> Ir-192 (an irradiator source) in the imaging hot lab used by imaging
>> services (PET). The HDR source is usually in a 5-gallon bucket that is
>> shielded. (We’ve made a
>>
>> Hello list,
>>
>>
>>
>> We have a site where they will be storing HDR sources like Ir-192 (an
>> irradiator source) in the imaging hot lab used by imaging services (PET).
>>
>>
>>
>> The HDR source is usually in a 5-gallon bucket that is shielded. (We’ve
>> made a measurement of 0.9 mrem at 1m). But the bucket resides in a cabinet
>> that has 1” shielding. However, it sits about 1m away from a dose
>> calibrator.
>>
>>
>>
>> I recall Ir-192 has a lot of hi-energy emissions. Will it (can it) effect
>> the dose calibrator measurements?
>>
>>
>>
>>
>>
>>
>>
>> Thanks
>>
>>
>>
>> *Nima Kasraie, *
>>
>>
>>
>> Department of Radiology
>>
>> 5323 Harry Hines Blvd., Dallas, Texas 75390-9071
>> <https://urldefense.com/v3/__https://www.google.com/maps/search/5323*Harry*Hines*Blvd.,*Dallas,*Texas*75390-9071?entry=gmail&source=g__;KysrKysr!!KGKeukY!xZEl85Axgheu6wlS0nyWIDTj-aHL2joe-ynw9XKD7G_TmZg5WGy635DrcidZsX9AazO4PoWxwrjZSMJc-NUp_X5pcWyqtAXbkQ7RIcCsxA$>
>>
>> Phone: 214-648-7978
>>
>> https://urldefense.com/v3/__http://www.utsouthwestern.edu/radiology__;!!KGKeukY!276dIYXJF2oRGOkRuXnl4eNrAJwg-3HRJPMzfEbqGxcpB00-O8THvOYqU2nGZqGSfN4rypOLQSqBduIL4Eo4YSYcVmN-CSwpWSj4MuI0$ 
>> <https://urldefense.com/v3/__http://www.utsouthwestern.edu/radiology__;!!KGKeukY!1N4I--4usUD7wZP6Rt7u09g2phbLf7An2HIyeZBXt09wNCkib2POTf92DTLx-irc0BOLOSB7XSJN3Bcrmx0aYcIthf9MrSxXOVUn-LpbnY7aYbbYHsmqlg$>
>>
>>
>>
>>
>>
>> ------------------------------
>>
>> UT Southwestern
>>
>> Medical Center
>>
>> The future of medicine, today.
>>
>
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