# Internal Dosimetry

Internal Dosimetry 150 150 Affordable Capstone Projects Written from Scratch

NSE 590

Internal Dosimetry

50 pts

Homework: #1

Date: January 23, 2018

Date Due: January 30, 2018

NOTE: Use http://www.nndc.bnl.gov/mird or ICRP 38/107 to find any needed decay schemes.

1. What is the activity (in GBq) of 1015 atoms of 32P, and what total beta energy rate (in μW)

is liberated from such a source?

1. What mass (in mg) of 226Ra will emit 1.16×1011 gamma rays at 0.186 MeV over a period of

1 day?

1. At 3:00 PM on Monday, a pure source of 99Mo was removed from the reactor and brought

to your lab. It sat undisturbed until 10:00 AM the following Thursday, when you were able

to extract 24 MBq of 99mTc. What was the activity of the 99Mo immediately after removal

from the reactor? The decay of 99Mo to 99mTc has a branching ratio of 88%.

1. Calculate the energy that an alpha and beta particle must have to just penetrate the dead

layer of a person’s skin (7 mg/cm2).

1. Some would think to use the effective Z for water as a substitute for the effective Z for

bone. Is this a good assumption? Calculate the effective Z’s for both to find out. The

chemical composition of mineral bone can be approximated as hydroxyapatite, with the

chemical formula Ca10(PO4)6(OH)2.

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