[ RadSafe ] [Non-DoD Source] Re: ] [Radsafe] Caution-Caution-news: One worker at Ibaraki facility found with up to 22, 000 becquerels of plutonium in lungs (UNCLASSIFIED)

Thu Jun 8 14:09:54 CDT 2017

Classification: UNCLASSIFIED
Caveats: NONE

Jeffery and Mattias,

"Jerry" works fine.

Jeffery:  MONDAL3 calculates 50-year committed effective doses.  So far, little "actual dose" has been received by these victims. Note that a committed effective dose is reported and not the lung dose (committed equivalent dose).

Mattias: I didn't use the graph. I used the "numerical data" option on the upper right under "| Higher quality graph (PDF file)|." This option allows you to enter the days after inhalation. The output of this option is what I inserted in my email.  Also, I used 1 day, not 0.1 days.  

At one day, 5 um AMAD, Type M, I read about 5.5E-4 Sv/Bq whereas the numerical option gives 5.556E-4 Sv/Bq.

The way I interpret the MONDAL3 output is that it reports (a) the retention or excretion fraction for the compartment of interest (e.g., lung or urine) and (b) the dose per unit content (DPUC) at a given time after inhalation.  So, as the time after inhalation changes so will both the retention/excretion and the DPUC values will change. MONDAL3 approaches this a bit differently from what seems to be a common practice of calculating intakes then doses.  MONDAL3 skips the intake calculation and gives the dose per unit content.

Other notes.

(1) I should have noted in my original email that MONDAL3 only estimates committed effective doses.  

(2) Unfortunately, I don't have easy access to IMBA to estimate organ doses.  However, I do have dose per unit intake (DPUI) values for Pu-239 from a different project.  The highest DPUI for 5 um AMAD, Type M, Pu-239 is 3.72E-5 Sv/Bq for the bone surfaces.  The DPUI for the lungs is 7.69E-7 Sv/Bq. The DPUI for the committed effective dose is 1.20E-6 Sv/Bq.  Assuming that the ratio of the DPUI value for the lung to the committed effective dose apply to the CED calculated by MONDAL3, I estimated that  the committed (50 years) equivalent dose to the lungs is about 30 times the committed effective dose.

I hope this helps to clarify things.

Jerry
__________________________
Gerald A. Falo, Ph.D., CHP
U.S. Army Public Health Center - Health Physics Division   
gerald.a.falo.civ at mail.mil   
gerald.a.falo.civ at mail.smil.mil   
Comm: 410-436-4852
DSN: 584-4852

-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu [mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of Mattias Lantz
Sent: Thursday, June 08, 2017 12:36 PM
To: The International Radiation Protection (Health Physics) Mailing List
Subject: Re: [ RadSafe ] [Non-DoD Source] Re: ] [Radsafe] Caution-Caution-news: One worker at Ibaraki facility found with up to 22, 000 becquerels of plutonium in lungs (UNCLASSIFIED)

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----

Dear all, and Dr. Falo,

I am also interested in understanding how the CED should be interpreted in the graph. If I understand correctly you read the values at 0.1 days after inhalation, i.e. shortly after the time of the inhalation. For each Bq of Pu-239 a given dose is given.
If instead an estimate of the present activity is made 10 days after the event then the value at 10 days is used, taking into account the dose up to that time and the fact that the activity at the time of the intake was higher than now.
Is this a correct interpretation?

Best wishes,
Mattias Lantz

________________________________
From: radsafe-bounces at health.phys.iit.edu <radsafe-bounces at health.phys.iit.edu> on behalf of Kulp, Jeffrey (DOH) <Jeffrey.Kulp at DOH.WA.GOV>
Sent: 08 June 2017 17:17:26
To: The International Radiation Protection (Health Physics) Mailing List
Subject: Re: [ RadSafe ] [Non-DoD Source] Re: ] [Radsafe] Caution-Caution-news: One worker at Ibaraki facility found with up to 22, 000 becquerels of plutonium in lungs (UNCLASSIFIED)

Hello Dr. Falo,

Over what period of time is the dose of 12.2 Sv delivered to the lungs?

Thanks,

Jeffrey Kulp, RRPT
Radiation Health Physicist
Washington State Department of Health - ORP
16201 E. Indiana Ave. Suite 1500
Spokane Valley, WA 99216
(509) 329-2138 (Office)
(509) 329-2154 (Fax)
"Public Health - Always Working for a Safer and Healthier Washington"

-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu [Caution-mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of Falo, Gerald A CIV USARMY MEDCOM APHC (US)
Sent: Thursday, June 8, 2017 7:12 AM
To: The International Radiation Protection (Health Physics) Mailing List <radsafe at health.phys.iit.edu>
Subject: Re: [ RadSafe ] [Non-DoD Source] Re: ] [Radsafe] Caution-Caution-news: One worker at Ibaraki facility found with up to 22, 000 becquerels of plutonium in lungs (UNCLASSIFIED)

Classification: UNCLASSIFIED
Caveats: NONE

All,

I used the online version of the MONDAL3 (Caution-http://www.nirs.qst.go.jp/db/anzendb/RPD/mondal3.php).

For an inhalation of Type M (unspecified compounds), one-day after intake, and retention in the lung, I got the following values.

                Retention/Excretion             Committed effective dose per measured activity (Sv/Bq)
0.1micron                3.01E-01                                 3.654E-4
0.3micron                1.53E-01                                 3.856E-4
1 micron                 1.09E-01                                 4.312E-4
3 micron                 8.17E-02                                 5.018E-4
5 micron                 5.76E-02                                 5.556E-4
10micron                 2.64E-02                                 7.576E-4

For 5 um and a lung content of 22,000 Bq, the CED is 12.2 Sv.

************
Note about MONDAL3.

"MONDAL3" is a PC based software that will help users to estimate intake of radionuclides inhaled or ingested by workers or by members of the public and resulting committed effective dose based on measurement results of individual monitoring such as in vivo counting or bioassay measurement.
"MONDAL3" is a free software. If you would like to receive it, please send an e-mail to mondal at qst.go.jp"
************

Jerry

__________________________
Gerald A. Falo, Ph.D., CHP
U.S. Army Public Health Center - Health Physics Division gerald.a.falo.civ at mail.mil gerald.a.falo.civ at mail.smil.mil
Comm: 410-436-4852
DSN: 584-4852

-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu [Caution-mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of Jaro Franta
Sent: Thursday, June 08, 2017 7:37 AM
To: 'The International Radiation Protection (Health Physics) Mailing List'
Subject: [Non-DoD Source] Re: [ RadSafe ] ] [Radsafe] Caution-Caution-news: One worker at Ibaraki facility found with up to 22, 000 becquerels of plutonium in lungs

All active links contained in this email were disabled.  Please verify the identity of the sender, and confirm the authenticity of all links contained within the message prior to copying and pasting the address to a Web browser.

----

The article states that "The agency estimates that the amount of radiation exposure of the man with the highest level translates to up to 12 sieverts over 50 years."

It doesn't say what that 12 Sv applies to - effective body dose, or dose to a particular organ.

So I looked at some Rad Toolbox calcs for inhalation of 22kBq of Pu239 (slow systemic transfer - 'S' or 'Y' case)

Caution-Caution-https://www.dropbox.com/s/u2uxiwr778347tv/22kBq_Pu239_dose_RadToolbox.JPG

Interesting to compare to Radium dial painters data - where no malignancies were seen below 3700 kBq (0.1mCi) of INGESTED activity.
Ingestion is of course a very different pathway, but Rad Toolbox calculates that, while the bone surface dose is much higher for the Ra226 ingestion case, the effective body dose is similar to inhalation of 22kBq of Pu239.

Caution-Caution-https://www.dropbox.com/s/xsav1daxx34zdbm/3700kBq_Ra226_ingestion_dose_RadTo
olbox.JPG

Caution-Caution-https://www.dropbox.com/s/xsk8c7agv5ulney/Radium_dial_painters_graphic.jpg

 Jaro
^^^^^^^^^^^^^^^^^^^^^^^^^

On Wed, Jun 7, 2017 at 4:30 PM, Nick Tsurikov <nick.tsurikov at gmail.com>
wrote:
> Dear all,
> The full article in Japan Today:
>
Caution-Caution-https://japantoday.com/category/national/5-workers-suffer-radiation-exposure
-one-with-up-to-22-000-becquerels-of-plutonium-in-his-lungs
> Kind regards
> Nick
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