Rso اختبار الحمايه من الاشعاع - ملتقى الفيزيائيين العرب
  #1  
قديم 24-09-2014, 18:50
الصورة الرمزية samixry
samixry
غير متواجد
فيزيائي جـديد
 
تاريخ التسجيل: Sep 2014
المشاركات: 6
افتراضي Rso اختبار الحمايه من الاشعاع

رد مع اقتباس
  #2  
قديم 03-03-2015, 22:07
الصورة الرمزية leen123
leen123
غير متواجد
فيزيائي جـديد
 
تاريخ التسجيل: Mar 2015
المشاركات: 7
افتراضي

ممكن مساعده في حل أي سؤال من هذه الأسئلة

_ A 0.495-MeV g-ray interacts with a K-shell electron by the photo- electric process.If the binding energy of the K-shell electron is 28keV, what happens to the rest of the photon energy?
_ If 1mCi of a radionuclide is adequately shielded by 5 HVLs of a shield- ing material, how many HVLs are needed to provide equal shielding for (a) 5mCi and (b) 8mCi?
_ A 1-mm lead apron will afford approximately twice as much protection as a 0.5-mm apron, or does this shielding depend on the energy of the radiation?
_ How many HVLs are approximately equivalent to three tenth-value layers?
_ Suppose 5% of the 364-keV photons of 131I are transmitted after passing through a lead brick of 10-cm thickness.Calculate the HVL of lead for 131I.
_ There is a 75% chance that a monoenergetic photon beam will be atten- uated by 4mm of lead.What is the HVL of lead for the photon?
_ Which of the following radiations has the highest LET? (a) 120-keV x-ray (b) 100-keV electron (c) 5-MeV a-particle (d) 10-MeV proton (e) 14-MeV neutron
_What is the difference between the effective dose equivalent and effective dose?

- Calculate the absorbed dose to the thyroid gland of a hyperthyroid patient from a dosage of 30mCi 131I, assuming 60% uptake, a biologi- cal half-life of 4 days for thyroid clearance of 131I, and S equal to 2.2 × 10−2rad/mCi•hr.
_ Calculate the dose in rems and sieverts to a tumor that received 35rads (0.35Gy) from neutron therapy (radiation weighting factor = 10 for neutrons).

_Calculate the cumulated activity in a 55-g source organ containing 3 mCi (111MBq) of 99mTc (t1/2 = 6hr) with a biological t1/2 = 14hr.
_ A target organ has a mass of 35g and contains 1mCi (37MBq) of a radionuclide emitting a b−-particle with D1 = 0.3g•rad/mCi•hr and f1 = 1.0, and a g-radiation with D2 = 0.2g•rad/mCi•hr and f2 = 0.35. Calculate the mean absorbed dose per cumulated activity.
_ An external beam deposits 360ergs of energy in 3g of tissue.What is the radiation dose in rad and cGy?
_The absorbed doses are 10rad (10cGy) to organ A, 5rad (5cGy) to organ B, and 6rad (6cGy) to organ C from each radiation from a 20mCi (370MBq) source containing two radiations having radiation weighting factors, Wr, as 1 and 10. The tissue weighting factors of organs A, B, and C are 0.30, 0.22, and 0.46, respectively. Considering the contribution from other organs negligible, calculate the effective dose.
رد مع اقتباس
  #3  
قديم 06-01-2018, 16:04
الصورة الرمزية مستر فرفوش
مستر فرفوش
غير متواجد
فيزيائي جـديد
 
تاريخ التسجيل: Jan 2018
المشاركات: 3
افتراضي

ما فاهم اخي وين المشكلة
رد مع اقتباس
اضافة رد

« الموضوع السابق | الموضوع التالي »

الذين يشاهدون محتوى الموضوع الآن : 1 ( الأعضاء 0 والزوار 1)
 
أدوات الموضوع
انواع عرض الموضوع

تعليمات المشاركة
لا تستطيع إضافة مواضيع جديدة
لا تستطيع الرد على المواضيع
لا تستطيع إرفاق ملفات
لا تستطيع تعديل مشاركاتك

BB code is متاحة
كود [IMG] متاحة
كود HTML معطلة

الانتقال السريع






الساعة الآن 22:29



Powered by vBulletin® Copyright ©2000 - 2018, Jelsoft Enterprises Ltd. TranZ By Almuhajir