August 6th was the day the Americans dropped the first atomic bomb on Hiroshima. My grandfather was a victim of the radiation from this bomb.
August 6th marks the day the Enola Gay dropped an atomic bomb on the city of Hiroshima. My grandfather was exposed to the radiation from this tragic event in history.
1) August 6th was the day the Americans dropped the first atomic bomb on Hiroshima. My grandfather was a victim of the radiation from this bomb.
「8月6日はアメリカが最初の原子爆弾を広島に落とした日です。わたしの祖父は、この爆弾で被爆しました。」
2) August 6th marks the day the Enola Gay dropped an atomic bomb on the city of Hiroshima. My grandfather was exposed to the radiation from this tragic event in history.
「8月6日はエノラ・ゲイが広島の街に原爆を落とした日を示す。私の祖父はこの歴史上悲惨な出来事で被爆した。」
＜単語＞
atomic bomb…原子爆弾
victim…被害者・犠牲者
radiation…放射能
Enola Gay…エノラ・ゲイ（B-29爆撃機で広島に原爆を投下した）
expose…さらす・受けさせる
tragic event…悲惨な出来事・惨事
ご参考まで！
My grandfather was exposed to radiation when an atomic bomb was dropped on Hiroshima in August 6th 1945.
When an atomic bomb was dropped on Hiroshima on 6th August 1945, my grandfather was exposed to radiation.
An atomic bomb was dropped on Hiroshima on August 6th 1945. As a result/consequently/because of this, my grandfather was exposed to radiation.
All of these sentences convey the key information: that your grandfather was exposed to radiation, how this happened, and the date it happened.
Note the date may be written 6th August (British format) or August 6th (American format).
My grandfather was a casualty of the Hiroshima bombing of the 6th of August 1945.
To be a casualty of an event or incident means that the
person was a victim. A casualty could either mean that he
died or was badly affected by the incident/attack/event.
Example sentence: The total number of Japanese casualties
after the Hiroshima bombing was 66 killed and 69 wounded.
August 6th is the anniversary of the Hiroshima bombing in which my grandfather was a casualty
The atomic bombing on Hiroshima took place on August 6th. My grandfather suffered exposure to radiation at that time.
August 6th is the day an atomic bomb dropped on Hiroshima. Your grandfather was exposed to radiation., and you would like to explain this. Any of the above suggestions should be adequate for your scenario.
My grandfather was exposed to radiation on August 6th when an atomic bomb was dropped on Hiroshima.
In this case, since the focus is your grandfather, I think that it is important to start the sentence with the fact that he was exposed to radiation. When we talk about dates, we use ordinal numbers which is why it is sixth instead of six. I hope that this helps. :)
On August 6th, an atomic bomb was dropped on Hiroshima and my grandfather was exposed to its radiation.
My grandfather was exposed to the radiation from the atomic bomb that hit Hiroshima on August 6th.
On August 6th, an atomic bomb was dropped on Hiroshima and my grandfather was exposed to its radiation.
My grandfather was exposed to the radiation from the atomic bomb that hit Hiroshima on August 6th.
Firstly, I would like to say that I am sorry to hear that, and I hope your grandfather is okay despite this exposition.
And, if you want to explain to people that the atomic bomb that hit Hiroshima exposed your grandfather to radiation, you can say one of these two sentences.
I hope this helps.
Have a great day.
Will
My grandfather was exposed to radiation from the atomic bomb that was dropped on Hiroshima on August 6th.
My grandfather was a victim of the radiation from the atomic bomb that was dropped on Hiroshima on August 6th.
-My grandfather was exposed to radiation from the atomic bomb that was dropped on Hiroshima on August 6th.
This sentence uses the phrase 'to be exposed' to say that your grandfather came in contact with the radiation from the bomb
-My grandfather was a victim of the radiation from the atomic bomb that was dropped on Hiroshima on August 6th.
This sentence uses the word 'victim' to say that your grandfather was negatively effected by the radiation.
カナダ 
イギリス 
南アフリカ 
アメリカ合衆国 
